San Lorenzo, CA Warnings, Watches and Advisories

Do not drive vehicles through flooded areas. The water depth and road condition may be unsafe. Additional information is available at https://water.weather.gov/ahps2/ Stay tuned for further updates by listening to NOAA weather radio... or your local radio and TV stations.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We provide a wider range of issued warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards San Lorenzo.

Use the Radar Maps link provided to understand the trajectory of a storm.

Excessive Heat Warning issued July 5 at 12:36AM PDT until July 11 at 11:00PM PDT by NWS Hanford CA

* WHAT...Dangerously hot conditions with a 75% Probability of high temperatures 111F or hotter and a 75% probability of minimum temperatures 76F or warmer. * WHERE...Indian Wells Valley and Mojave Desert. * WHEN...Until 11 PM PDT Thursday. * IMPACTS...This level of rare, long-duration extreme heat with little to no overnight relief affects everyone, especially those without effective cooling and/or adequate hydration. * ADDITIONAL DETAILS...Impacts likely in most health systems, heat-sensitive industries and infrastructure.

Excessive Heat Warning issued July 5 at 12:36AM PDT until July 11 at 11:00PM PDT by NWS Hanford CA

* WHAT...Dangerously hot conditions Extreme HeatRisk will occur through the duration of this heat wave. * WHERE...A portion of central California. * WHEN...Until 11 PM PDT Thursday. * IMPACTS...This level of rare, long-duration extreme heat with little to no overnight relief affects everyone, especially those without effective cooling and/or adequate hydration. * ADDITIONAL DETAILS...Impacts likely in most health systems, heat-sensitive industries and infrastructure.

Excessive Heat Warning issued July 5 at 12:36AM PDT until July 11 at 11:00PM PDT by NWS Hanford CA

* WHAT...Dangerously hot conditions with a 50% probability of temperatures 105F or hotter. * WHERE...Grapevine. * WHEN...Until 11 PM PDT Thursday. * IMPACTS...This level of rare, long-duration extreme heat with little to no overnight relief affects everyone, especially those without effective cooling and/or adequate hydration. * ADDITIONAL DETAILS...Impacts likely in most health systems, heat-sensitive industries and infrastructure.

Air Quality Alert issued July 4 at 11:02PM PDT by NWS San Diego CA

The South Coast AQMD has issued an air quality alert in inland parts of the South Coast Air Basin and the Coachella Valley due to high levels of ozone (smog). The air quality alert is in effect 11 AM Wednesday through 7 PM Saturday. The South Coast AQMD has issued an air quality alert in the South Coast Air Basin due to high levels of fine particle pollution. The air quality alert is in effect through Friday evening. Elevated levels of ozone the predominant summertime pollutant are likely to result in poor air quality in the afternoon and early- evening hours. Ozone air pollution can cause respiratory health problems, including trouble breathing, asthma attacks, and lung damage. Children, older adults, and people with asthma or COPD may be more sensitive to the health effects of ozone. Exposure to particle pollution can cause serious health problems, aggravate heart and lung disease, cause asthma attacks and acute bronchitis, and increase risk of respiratory infections. People with respiratory or heart disease, older adults, and children are particularly susceptible. Air quality can change depending on time of day and weather conditions. Increased emissions of chemicals and faster ozone formation rates due to heat, along with low winds and stagnant weather can cause unusually high and persistent levels of ozone pollution. To help minimize ozone air pollution levels: * Limit the use of gasoline powered lawn and garden equipment until evening hours * Conserve electricity and set your air conditioner at a higher temperature * Try to delay trips to the gas station and the use of household chemicals until the evening To help keep indoor air clean during periods of poor air quality, close all windows and doors and run your air conditioner and/or an air purifier. If possible, do not use whole house fans or swamp coolers that bring in outside air. Avoid burning wood in your fireplace or firepit and minimize sources of indoor air pollution such as candles, incense, pan-frying, and grilling. Limit the use of gasoline powered lawn and garden equipment. Check air quality levels and take appropriate action as needed. When air quality index (AQI) levels are Unhealthy for Sensitive Groups (orange), people with heart or lung disease, pregnant women, children, and older adults should limit prolonged or heavy outdoor exertion. When air quality reaches Unhealthy (red) AQI levels, everyone may experience adverse health effects and sensitive groups should avoid prolonged time outdoors. At Very Unhealthy (purple) AQI levels, sensitive groups should avoid all outdoor physical activity and everyone else should avoid prolonged or heavy outdoor exertion. In the South Coast Air Basin and Coachella Valley, to view current and forecasted air quality levels, visit the South Coast Air Quality Management District website at aqmd.gov or download the mobile app at www.aqmd.gov/mobileapp. Additional details for this air quality alert may be available at www.aqmd.gov/advisory. In the Mojave Desert, to view current and forecasted air quality levels, visit the Mojave Desert Air Quality Management District website at mdaqmd.ca.gov. Additional details for this air quality alert may be available at www.mdaqmd.ca.gov/advisories. In Antelope Valley, to view current and forecasted air quality levels, visit the antelope Valley Air Quality Management District website at www.avaqmd.ca.gov. in San Diego County, to view current and forecasted air quality levels, visit the San Diego County Air Pollution Control District website at www.sdapcd.org/content/sdapcd/air-quality.html. Additional details for this air quality alert may be available at www.sdapcd.org/content/sdapcd/air-quality/smoke-advisory.html For the latest air quality forecasts and information, visit the website at aqmd.gov.

Red Flag Warning issued July 4 at 10:06PM PDT until July 5 at 12:00PM PDT by NWS Hanford CA

* AFFECTED AREA...Fire weather zone 579.Fire weather zone 580.Fire weather zone 590.Fire weather zone 591.Fire weather zone 596. * WIND...Gusts to 20-25 mph. * HUMIDITY...Less than 15%. * IMPACTS...any use of incendiary devices will greatly increase the risk of quick starting, fast spreading grass fires under what are typically low to moderate wind speeds. This is because of an abnormal amount of herbaceous fuels. Outdoor burning is not recommended.

Red Flag Warning issued July 4 at 10:06PM PDT until July 6 at 6:00AM PDT by NWS Hanford CA

* AFFECTED AREA...Fire weather zone 597. * WIND...Gusts to 40 mph. * HUMIDITY...10% or lower. * IMPACTS...any use of incendiary devices will greatly increase the risk of quick starting, fast spreading grass fires. Outdoor burning is not recommended.

Excessive Heat Warning issued July 4 at 9:40PM PDT until July 6 at 9:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with temperatures of 90 to 104 expected. * WHERE...Riverside County Mountains, San Bernardino County Mountains, and San Diego County Mountains. * WHEN...From 11 AM Friday to 9 PM PDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Heat Advisory issued July 4 at 9:40PM PDT until July 6 at 9:00PM PDT by NWS San Diego CA

* WHAT...Temperatures 0f 88 to 96 expected. * WHERE...Orange County Inland Areas. * WHEN...From 11 AM Friday to 9 PM PDT Saturday. * IMPACTS...Hot temperatures may cause heat illnesses.

Excessive Heat Warning issued July 4 at 9:40PM PDT until July 6 at 9:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with temperatures of 98 to 103 degrees, locally up to 108 degrees for the far inland valleys expected. * WHERE...San Diego County Valleys. * WHEN...From 11 AM Friday to 9 PM PDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Heat Advisory issued July 4 at 9:40PM PDT until July 6 at 9:00PM PDT by NWS San Diego CA

* WHAT...Temperatures of 96 to 104 expected. * WHERE...Santa Ana Mountains and Foothills. * WHEN...From 11 AM Friday to 9 PM PDT Saturday. * IMPACTS...Hot temperatures may cause heat illnesses.

Excessive Heat Warning issued July 4 at 9:40PM PDT until July 6 at 9:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with temperatures of 100 to 110 degrees, locally up to 113 expected. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN...From 11 AM Friday to 9 PM PDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Excessive Heat Warning issued July 4 at 9:40PM PDT until July 10 at 9:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with temperatures of 106 to 113 expected. * WHERE...Apple and Lucerne Valleys. * WHEN...Until 9 PM PDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. A prolonged period of extreme temperatures will exacerbate impacts from the heat. * ADDITIONAL DETAILS...Friday and Saturday are expected to be the hottest days.

Excessive Heat Warning issued July 4 at 9:40PM PDT until July 10 at 9:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with temperatures of 110 to 117 expected. * WHERE...San Gorgonio Pass Near Banning. * WHEN...Until 9 PM PDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Excessive Heat Warning issued July 4 at 9:40PM PDT until July 10 at 9:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with temperatures of 115 to 121 expected. * WHERE...Coachella Valley and San Diego County Deserts. * WHEN...Until 9 PM PDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. A prolonged period of extreme temperatures will exacerbate impacts from the heat. * ADDITIONAL DETAILS...This is long-duration heat wave with high temperatures of 115 or higher expected through at least next Wednesday.

Wind Advisory issued July 4 at 9:06PM PDT until July 5 at 5:00AM PDT by NWS Los Angeles/Oxnard CA

* WHAT...For the Wind Advisory, north winds 20 to 30 mph with gusts of 45 to 50 mph. For the Excessive Heat Warning, dangerously hot conditions with temperatures up to 103. * WHERE...Santa Ynez Mountains Western Range. * WHEN...For the Wind Advisory, until 5 AM PDT Friday. For the Excessive Heat Warning, until 6 PM PDT Monday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Heat related illnesses increase significantly during extreme heat events.

Wind Advisory issued July 4 at 9:06PM PDT until July 5 at 5:00AM PDT by NWS Los Angeles/Oxnard CA

* WHAT...For the Wind Advisory, northwest winds 20 to 30 mph with gusts of 45 to 50 mph. For the Excessive Heat Warning, dangerously hot conditions with temperatures up to 98. * WHERE...Santa Barbara County Southwestern Coast. * WHEN...For the Wind Advisory, until 5 AM PDT Friday. For the Excessive Heat Warning, until 6 PM PDT Saturday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Heat related illnesses increase significantly during extreme heat events.

Excessive Heat Warning issued July 4 at 9:06PM PDT until July 6 at 6:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Dangerously hot conditions with temperatures up to 99. * WHERE...Santa Barbara County Southeastern Coast. * WHEN...Until 6 PM PDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Excessive Heat Warning issued July 4 at 9:06PM PDT until July 6 at 6:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...For the Wind Advisory, northwest winds 20 to 30 mph with gusts of 45 to 50 mph. For the Excessive Heat Warning, dangerously hot conditions with temperatures up to 98. * WHERE...Santa Barbara County Southwestern Coast. * WHEN...For the Wind Advisory, until 5 AM PDT Friday. For the Excessive Heat Warning, until 6 PM PDT Saturday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Heat related illnesses increase significantly during extreme heat events.

Heat Advisory issued July 4 at 9:06PM PDT until July 7 at 6:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Temperatures up to 105. * WHERE...Los Angeles County San Gabriel Valley. * WHEN...Until 6 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses.

Heat Advisory issued July 4 at 9:06PM PDT until July 7 at 6:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Temperatures up to 96. * WHERE...Los Angeles County Inland Coast including Downtown Los Angeles, San Luis Obispo County Inland Central Coast, Santa Barbara County Inland Central Coast, and Ventura County Inland Coast. * WHEN...Until 6 PM PDT Sunday. * IMPACTS...Hot temperatures may cause heat illnesses.

Excessive Heat Warning issued July 4 at 9:06PM PDT until July 8 at 6:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Dangerously hot conditions with temperatures up to 108. * WHERE...A portion of southwest California. * WHEN...Until 6 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Excessive Heat Warning issued July 4 at 9:06PM PDT until July 8 at 6:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...For the Wind Advisory, north winds 20 to 30 mph with gusts of 45 to 50 mph. For the Excessive Heat Warning, dangerously hot conditions with temperatures up to 103. * WHERE...Santa Ynez Mountains Western Range. * WHEN...For the Wind Advisory, until 5 AM PDT Friday. For the Excessive Heat Warning, until 6 PM PDT Monday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result. Heat related illnesses increase significantly during extreme heat events.

Excessive Heat Warning issued July 4 at 9:06PM PDT until July 10 at 6:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Dangerously hot conditions with temperatures up to 112. * WHERE...A portion of southwest California. * WHEN...Until 6 PM PDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Heat Advisory issued July 4 at 8:36PM PDT until July 5 at 9:00AM PDT by NWS Eureka CA

* WHAT...Widespread temperatures exceeding 100. * WHERE...Southwestern Humboldt. * WHEN...Until 9 AM PDT Friday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. * ADDITIONAL DETAILS...Heat can significantly impact outdoor activities. Hot weather will continue with near and exceeding record temperatures through the weekend and into next week

Heat Advisory issued July 4 at 8:36PM PDT until July 5 at 9:00AM PDT by NWS Eureka CA

* WHAT...Moderate to localized Extreme HeatRisk with highs up to 110 and limited overnight relief with lows near 70. * WHERE...Southern Humboldt Interior. * WHEN...For the Heat Advisory, until 9 AM PDT Friday. For the Excessive Heat Warning, from 10 AM Friday to 8 PM PDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat. This level of heat will affect anyone without effective cooling or adequate hydration. * ADDITIONAL DETAILS...Heat can significantly impact outdoor activities. Hot weather will continue with near and exceeding record temperatures through the weekend and into next week.

Excessive Heat Warning issued July 4 at 8:36PM PDT until July 6 at 8:00PM PDT by NWS Eureka CA

* WHAT...Moderate to localized Extreme HeatRisk with highs up to 110 and limited overnight relief with lows near 70. * WHERE...Southern Humboldt Interior. * WHEN...For the Heat Advisory, until 9 AM PDT Friday. For the Excessive Heat Warning, from 10 AM Friday to 8 PM PDT Saturday. * IMPACTS...Heat related illnesses increase significantly during extreme heat. This level of heat will affect anyone without effective cooling or adequate hydration. * ADDITIONAL DETAILS...Heat can significantly impact outdoor activities. Hot weather will continue with near and exceeding record temperatures through the weekend and into next week.

Excessive Heat Warning issued July 4 at 8:36PM PDT until July 8 at 7:00PM PDT by NWS Eureka CA

* WHAT...Dangerously hot conditions with widespread highs of 110, and some isolated valleys nearing 120. * WHERE...Trinity County. * WHEN...Until 7 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. * ADDITIONAL DETAILS...Heat can significantly impact outdoor activities. Hot weather will continue with near and exceeding record temperatures through the weekend and into next week.

Heat Advisory issued July 4 at 8:36PM PDT until July 8 at 8:00PM PDT by NWS Eureka CA

* WHAT...High temperatures reaching or exceeding 100 for a prolonged period * WHERE...Del Norte Interior. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat. This level of heat will affect anyone without effective cooling or adequate hydration. * ADDITIONAL DETAILS...Heat can significantly impact outdoor activities. Hot weather will continue with near and exceeding record temperatures through the weekend and into next week

Heat Advisory issued July 4 at 8:36PM PDT until July 8 at 8:00PM PDT by NWS Eureka CA

* WHAT...Widespread temperatures reaching or exceeding 100 for a prolonged period. * WHERE...Southwestern Mendocino Interior. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat. This level of heat will affect anyone without effective cooling or adequate hydration. * ADDITIONAL DETAILS...Heat can significantly impact outdoor activities. Hot weather will continue with near and exceeding record temperatures through the weekend and into next week

Excessive Heat Warning issued July 4 at 8:36PM PDT until July 8 at 8:00PM PDT by NWS Eureka CA

* WHAT...Dangerously hot conditions with widespread locations reaching or exceeding 110. * WHERE...Lake County, and Southeastern Mendocino Interior. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat. This level of heat will affect anyone without effective cooling or adequate hydration. * ADDITIONAL DETAILS...Heat can significantly impact outdoor activities. Hot weather will continue with near and exceeding record temperatures through the weekend and into next week

Excessive Heat Warning issued July 4 at 8:36PM PDT until July 8 at 8:00PM PDT by NWS Eureka CA

* WHAT...Dangerously hot conditions with many valleys reaching or exceeding 110. * WHERE...Northern Mendocino Interior. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat. This level of heat will affect anyone without effective cooling or adequate hydration. * ADDITIONAL DETAILS...Heat can significantly impact outdoor activities. Hot weather will continue with near and exceeding record temperatures through the weekend and into next week

Beach Hazards Statement issued July 4 at 8:20PM PDT until July 7 at 5:00PM PDT by NWS San Diego CA

* WHAT...Surf of 3 to 5 feet, strong longshore currents, and dangerous rip currents. Sets to 7 feet for south and southwest facing beaches, particularly in Orange County. * WHERE...San Diego County Coastal Areas and Orange County Coastal Areas. * WHEN...Through Sunday afternoon. Highest surf will be late Friday through Saturday. * IMPACTS...Increased risk of rip currents and dangerous swimming conditions. * ADDITIONAL DETAILS...Surf subsides Sunday.

Excessive Heat Warning issued July 4 at 6:38PM PDT until July 10 at 11:00PM PDT by NWS San Francisco CA

* WHAT...Dangerously hot conditions with temperatures in the upper 90's to 105F expected. Limited overnight relief with low temperatures in the mid 60s to low 80s. Resultant widespread Major HeatRisk, with areas of Extreme HeatRisk. * WHERE...Marin Coastal Range, Sonoma Coastal Range, North Bay Interior Mountains, North Bay Interior Valleys, East Bay Interior Valleys, Santa Cruz Mountains, Santa Clara Valley, Eastern Santa Clara Hills, East Bay Hills, Southern Salinas Valley, Santa Lucia Mountains and Los Padres National Forest, and Mountains of San Benito and Interior Monterey. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Most individuals will be at risk for heat-related illnesses without effective cooling or adequate hydration, especially with prolonged outdoor exposure. Without effective cooling and/or adequate hydration, heat-related illnesses including heat stroke will be a risk to everyone. Overnight lows will warm as well leading to poor relief from the heat specifically in elevated terrain and interior areas. * ADDITIONAL DETAILS...An exceptionally dangerous situation is expected to unfold during this potentially historic and deadly heat event. Several days of temperatures well above normal will lead to compounding effects among people and infrastructure, with the possibility of numerous heat related fatalities. It cannot be stressed enough that while one day at these temperatures may be manageable for some, an event of this scale, magnitude, and longevity will likely rival anything we've seen in the last 18 years. Heat is the number one weather related killer in the United States. By this weekend, it is VERY LIKELY that we add to that statistic if preparations are not taken seriously.

Heat Advisory issued July 4 at 6:38PM PDT until July 10 at 11:00PM PDT by NWS San Francisco CA

* WHAT...Temperatures in the lower 80s to mid 90s. * WHERE...San Francisco Bay Shoreline, Northern Monterey Bay, and Northern Salinas Valley, Hollister Valley, and Carmel Valley. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Those sensitive to heat, such as the homeless, elderly, children, and pets will be at risk for heat-related illnesses. Those without effective cooling and/or adequate hydration will be at the greatest risk. * ADDITIONAL DETAILS...An exceptionally dangerous situation is expected to unfold over the next week as we enter a potentially historic and deadly heat event for inland areas. Several days of temperatures well above normal will lead to compounding effects among people and infrastructure, with the possibility of numerous heat related fatalities. It cannot be stressed enough that while one day at these temperatures may be manageable for some, an event of this scale, magnitude, and longevity will likely rival anything we've seen in the last 18 years. Heat is the number one weather related killer in the United States. By this weekend, it is VERY LIKELY that we add to that statistic if preparations are not taken seriously.

Red Flag Warning issued July 4 at 2:57PM PDT until July 6 at 11:00PM PDT by NWS Eureka CA

...Record heat and very dry relative humidity values will combine with gusty winds to create Red Flag conditions... The National Weather Service in Eureka has issued a Red Flag Warning, which is in effect from 3 PM Friday to 11 PM PDT Saturday. * AFFECTED AREA...Fire weather zone 264. * WIND...Northwest winds of 10 to 15 mph and gusts up to 25 mph. * HUMIDITY...Poor overnight relative humidity recovery of 25 to 30 percent followed by very dry daytime values to the single digits. * IMPACTS...any fires that develop will likely spread rapidly. Outdoor burning is not recommended.

Fire Weather Watch issued July 4 at 2:57PM PDT until July 7 at 11:00PM PDT by NWS Eureka CA

...Record heat and very dry relative humidity values will combine with gusty winds to create Red Flag conditions... The National Weather Service in Eureka has issued a Fire Weather Watch, which is in effect from Saturday afternoon through Sunday evening. * AFFECTED AREA...Fire weather zone 283. * WIND...Westerly winds of 10 to 15 mph and gusts up to 25 mph. * HUMIDITY...Poor overnight relative humidity recovery of 25 to 35 percent followed by very dry daytime values to the single digits. * IMPACTS...any fires that develop will likely spread rapidly. Outdoor burning is not recommended.

Fire Weather Watch issued July 4 at 2:41PM PDT until July 7 at 11:00PM PDT by NWS Medford OR

The National Weather Service in Medford has issued a Fire Weather Watch, which is in effect from Saturday afternoon through Sunday evening. * IMPACTS...Any fires that develop will likely spread rapidly. Outdoor burning is not recommended. * AFFECTED AREA...Fire weather zones 616...620...621...622 & 623. * WIND...Northwest wind increasing to 10-16 mph with gusts as high as 25 mph. * HUMIDITY...8 to 15 percent. * DETAILEDURL...View the hazard area in detail at https://www.wrh.noaa.gov/map/?wfo=mfr

Red Flag Warning issued July 4 at 2:19PM PDT until July 6 at 6:00AM PDT by NWS Los Angeles/Oxnard CA

...RISK OF CRITICAL FIRE WEATHER CONDITIONS THROUGH FRIDAY NIGHT OVER MOST MOUNTAINS, SOUTHWEST SANTA BARBARA COUNTY, AND INTERIOR SAN LUIS OBISPO COUNTY... .A extremely long-duration heat wave will bring very hot and dry conditions to southwest California well into next week, hottest Friday and Saturday. The hot and dry conditions will coincide with northwest to northeast winds, gusting from 20 to 40 mph, this evening through Friday night across many mountain and interior areas, as well as southwest Santa Barbara County. While classic Red Flag thresholds will likely not be met, considering the extreme nature of this event and the holiday fire ignition sources available, conditions are favorable for critical fire weather behavior. The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for wind and low relative humidity, which is in effect from 10 AM Friday to 6 AM PDT Saturday. The Fire Weather Watch is no longer in effect. * WINDS...North to northeast winds gusting to 20 to 35 mph. * RELATIVE HUMIDITY...Minimum relative humidity 6 to 12 percent with poor to moderate overnight recovery. * IMPACTS...If fire ignition occurs, conditions are favorable for extreme fire behavior which would threaten life and property.

Red Flag Warning issued July 4 at 2:19PM PDT until July 6 at 6:00AM PDT by NWS Los Angeles/Oxnard CA

...RISK OF CRITICAL FIRE WEATHER CONDITIONS THROUGH FRIDAY NIGHT OVER MOST MOUNTAINS, SOUTHWEST SANTA BARBARA COUNTY, AND INTERIOR SAN LUIS OBISPO COUNTY... .A extremely long-duration heat wave will bring very hot and dry conditions to southwest California well into next week, hottest Friday and Saturday. The hot and dry conditions will coincide with northwest to northeast winds, gusting from 20 to 40 mph, this evening through Friday night across many mountain and interior areas, as well as southwest Santa Barbara County. While classic Red Flag thresholds will likely not be met, considering the extreme nature of this event and the holiday fire ignition sources available, conditions are favorable for critical fire weather behavior. * WINDS...Northwest to north winds gusting 25 to 40 mph. * RELATIVE HUMIDITY...Minimum relative humidity 6 to 12 percent with poor overnight recovery. * IMPACTS...If fire ignition occurs, conditions are favorable for extreme fire behavior which would threaten life and property.

Coastal Flood Advisory issued July 4 at 2:17PM PDT until July 5 at 5:00AM PDT by NWS San Francisco CA

* WHAT...Minor coastal flooding. * WHERE...Bayshore coasts along the San Francisco and San Pablo Bays. * WHEN...Until 5 AM PDT Friday. * IMPACTS...Flooding of lots, parks, and roads with only isolated road closures expected. * ADDITIONAL DETAILS...Tidal levels are increasing as a result of higher astronomical tides. Low lying areas within the SF Bay Area may see minor flooding as a result during high tide. Next high tide in San Francisco is 6.71 feet at 10:45 PM July 4th.

Excessive Heat Warning issued July 4 at 2:11PM PDT until July 8 at 9:00PM PDT by NWS Medford OR

* WHAT...Dangerously hot conditions with high temperatures of 100 to 115 and low temperatures in the upper 60s expected over multiple days. Overnight low temperatures will remain in the mid to upper 60s. * WHERE...In California, western and central Siskiyou County. This includes the cities of Yreka, Weed, Etna, and Happy Camp, Mt Shasta City, and Dunsmuir. In Oregon, Josephine and Jackson counties and eastern Curry County. This includes the entire Rogue Valley and the cities of Medford, Grants Pass, Cave Junction, and Butte Falls. * WHEN...Until 9 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat and high humidity events. Area rivers will be cold and can cause shock to swimmers. * ADDITIONAL DETAILS...This will be a multi day heat wave with the warmest temperatures on Friday and Saturday. The Medford Airport has a 40% chance to tie or exceed the all time temperature record of 115.

Heat Advisory issued July 4 at 2:11PM PDT until July 8 at 9:00PM PDT by NWS Medford OR

* WHAT...High temperatures of 95 to 100 degrees with lows in the upper 50's expected over multiple days. * WHERE...In California, Modoc County and eastern Siskiyou County. This includes the cities and communities of Macdoel, Tulelake, Pondosa, Bray, Tennant, Dorris Tionesta, Alturas, and Adin. In Oregon, Klamath and Lake Counties. This includes the cities of Klamath Falls, Chemult, Summer Lake, Chiloquin, Malin, Keno, Sprague River, and Lakeview * WHEN...Until 9 PM PDT Monday. * IMPACTS...Hot temperatures and high humidity may cause heat illnesses. Area rivers will be cold and can cause shock to swimmers. * ADDITIONAL DETAILS...This will be a long-duration heatwave with temperatures lingering through at least Monday.

Red Flag Warning issued July 4 at 2:08PM PDT until July 5 at 5:00AM PDT by NWS San Francisco CA

...CRITICAL FIRE WEATHER CONDITIONS INTO SATURDAY... Red Flag Warnings are in effect for the North Bay Interior Mountains, East Bay Hills, and Santa Cruz Mountains until 9 PM Saturday. Red Flag Warnings are in effect for the Marin and Sonoma Coastal Range until 5 AM Friday. Red Flag Warnings are in effect for the Santa Lucia Mountains, San Benito County, and the Southern Salinas Valley from 9 AM Friday through 9 PM Saturday. * AFFECTED AREA...Fire Weather Zone 502 Marin Coastal Range and Fire Weather Zone 503 Sonoma Coastal Range. * TIMING...Until 5 AM Friday. * WINDS...West 5 to 10 mph with gusts up to 20 mph. * RELATIVE HUMIDITY...As low as 8 percent. * TEMPERATURES...Up to 96. * IMPACTS...Critical fire weather conditions. Increased chance for fire starts in dry, open grasses. Outdoor burning and especially fireworks are not recommended.

Red Flag Warning issued July 4 at 2:08PM PDT until July 6 at 9:00PM PDT by NWS San Francisco CA

...CRITICAL FIRE WEATHER CONDITIONS INTO SATURDAY... Red Flag Warnings are in effect for the North Bay Interior Mountains, East Bay Hills, and Santa Cruz Mountains until 9 PM Saturday. Red Flag Warnings are in effect for the Marin and Sonoma Coastal Range until 5 AM Friday. Red Flag Warnings are in effect for the Santa Lucia Mountains, San Benito County, and the Southern Salinas Valley from 9 AM Friday through 9 PM Saturday. * AFFECTED AREA...Fire Weather Zone 504 North Bay Interior Mountains, Fire Weather Zone 512 Santa Cruz Mountains and Fire Weather Zone 515 East Bay Hills. * TIMING...Until 9 PM Saturday. * WINDS...West 5 to 15 mph with gusts up to 30 mph. * RELATIVE HUMIDITY...As low as 8 percent. * TEMPERATURES...Up to 105. * IMPACTS...Critical fire weather conditions. Increased chance for fire starts in dry, open grasses. Outdoor burning and especially fireworks are not recommended.

Red Flag Warning issued July 4 at 2:08PM PDT until July 6 at 9:00PM PDT by NWS San Francisco CA

...CRITICAL FIRE WEATHER CONDITIONS INTO SATURDAY... Red Flag Warnings are in effect for the North Bay Interior Mountains, East Bay Hills, and Santa Cruz Mountains until 9 PM Saturday. Red Flag Warnings are in effect for the Marin and Sonoma Coastal Range until 5 AM Friday. Red Flag Warnings are in effect for the Santa Lucia Mountains, San Benito County, and the Southern Salinas Valley from 9 AM Friday through 9 PM Saturday. * AFFECTED AREA...Fire Weather Zone 516 Southern Salinas Valley/Arroyo Seco and Lake San Antonio, Fire Weather Zone 517 Santa Lucia Mountains and Los Padres National Forest and Fire Weather Zone 518 Mountains of San Benito County And Interior Monterey County including Pinnacles National Park. * TIMING...From 9 AM Friday to 9 PM Saturday. * WINDS...Northwest 10 to 20 mph with gusts up to 35 mph. * RELATIVE HUMIDITY...As low as 8 percent. * TEMPERATURES...Up to 111. * IMPACTS...Critical fire weather conditions. Increased chance for fire starts in dry, open grasses. Outdoor burning and especially fireworks are not recommended.

Excessive Heat Warning issued July 4 at 1:39PM PDT until July 9 at 11:00PM PDT by NWS Sacramento CA

* WHAT...Dangerously hot conditions with high temperatures from 103 to 117. Limited overnight relief with low temperatures in the upper 60s to mid 80s. Widespread Major to Extreme HeatRisk is expected. * WHERE...Carquinez Strait and Delta, Sacramento Valley, Northern San Joaquin Valley, Motherlode, Mountains Southwestern Shasta County to Western Colusa County, Northeast Foothills, and Shasta Lake Area / Northern Shasta County. * WHEN...Until 11 PM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Heat could significantly impact outdoor holiday activities. Area waterways will continue to run cold and fast, creating dangerous conditions for those seeking relief in rivers and lakes. Delta breeze influence will result in slightly cooler, but still hot temperatures in the Vicinity Delta and western portions of the Sacramento Area by late weekend into early next week.

Heat Advisory issued July 4 at 1:39PM PDT until July 9 at 11:00PM PDT by NWS Sacramento CA

* WHAT...Hot conditions with high temperatures up to 95-110. Limited overnight relief with low temperatures in the upper 50s to upper 70s. Areas of Major and Extreme HeatRisk are expected. * WHERE...Burney Basin / Eastern Shasta County, West Slope Northern Sierra Nevada, and Western Plumas County/Lassen Park. * WHEN...Until 11 PM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events, particularly for those working or participating in outdoor activities. * ADDITIONAL DETAILS...Heat could significantly impact outdoor holiday activities. Area waterways will continue to run cold and fast, creating dangerous conditions for those seeking relief in rivers and lakes.

Excessive Heat Warning issued July 4 at 1:34PM MST until July 9 at 8:00PM MST by NWS Phoenix AZ

* WHAT...Dangerously hot conditions. Afternoon temperatures 107 to 120. Major Heat Risk. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. * WHERE...Southeastern Imperial County, Salton Sea, and Chuckwalla Mountains. * WHEN...Until 8 PM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Excessive Heat Warning issued July 4 at 1:34PM MST until July 9 at 8:00PM MST by NWS Phoenix AZ

* WHAT...Dangerously hot conditions. Afternoon temperatures 113 to 123. Major Heat Risk. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. * WHERE...Southwest corner of Imperial County, Western Imperial County, Parker Valley, Imperial Valley, Palo Verde Valley, and Chuckwalla Valley. * WHEN...Until 8 PM MST /8 PM PDT/ Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Excessive Heat Warning issued July 4 at 1:34PM MST until July 9 at 8:00PM MST by NWS Phoenix AZ

* WHAT...Dangerously hot conditions. Afternoon temperatures 102 to 118. Extreme Heat Risk. Increase in heat related illnesses, including heat cramps, heat exhaustion, and heat stroke. Heat stroke can lead to death. * WHERE...Western portion of Joshua Tree National Park, Eastern portion of Joshua Tree National Park, and Chiriaco Summit. * WHEN...Until 8 PM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Heat Advisory issued July 4 at 10:26AM PDT until July 10 at 11:00PM PDT by NWS Las Vegas NV

* WHAT...High temperatures 90 to 100 on either side of Westgard Pass on Highway 168, 85 to 90 at 8000 feet in the Spring Mountains and Sheep Range, and 105 to 110 at 4000 feet in Red Rock Canyon. * WHERE...White and Inyo Mountains, Sheep Range, and Spring Mountains-Red Rock Canyon. * WHEN...From 11 AM Saturday to 11 PM PDT Wednesday. * IMPACTS...Hot temperatures may cause heat illnesses.

Excessive Heat Warning issued July 4 at 10:26AM PDT until July 10 at 11:00PM PDT by NWS Las Vegas NV

* WHAT...Dangerously hot conditions for an unusually long period. High temperatures 105 to 111 in the Owens Valley, 110 to 118 in Las Vegas, Pahrump, and Barstow, and 122 to 129 at Furnace Creek in Death Valley National Park. * WHERE...In California, Death Valley National Park, Owens Valley, and Western Mojave Desert. In Nevada, Las Vegas Valley and Western Clark and Southern Nye County. * WHEN...Until 11 PM PDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Excessive Heat Warning issued July 4 at 10:26AM PDT until July 10 at 11:00PM PDT by NWS Las Vegas NV

* WHAT...Dangerously hot conditions for an unusually long period. High temperatures 107 to 111 in Beatty and Kingman, 110 to 117 in Primm and the Morongo Basin, and 113 to 121 in Baker, Mesquite, and the Colorado River Valley. * WHERE...Portions of northwest Arizona, southeast California, and south central and southern Nevada. * WHEN...Until 11 PM PDT /11 PM MST/ Wednesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Heat Advisory issued July 4 at 9:24AM PDT until July 10 at 10:00AM PDT by NWS Reno NV

* WHAT...Hot daytime temperatures in the 90s to near 100 this weekend into next week will result in a prolonged period of Moderate HeatRisk and heat health impacts for those sensitive to heat or those without access to effective cooling. * WHERE...Greater Lake Tahoe Area, Surprise Valley California, Lassen-Eastern Plumas-Eastern Sierra Counties, and Mono County. * WHEN...From 10 AM Saturday to 10 AM PDT Wednesday. * IMPACTS...Heat related illnesses increase significantly during heat events, particularly for those working or participating in outdoor activities.

Beach Hazards Statement issued July 4 at 8:22AM PDT until July 7 at 10:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Dangerous rip currents and breaking waves due to elevated surf expected. Surf heights around 5 feet in southerly swell with 15 to 17 second wave periods. * WHERE...Ventura County Beaches, Malibu Coast and Los Angeles County Beaches. * WHEN...Through Sunday evening. * IMPACTS...There is an increased risk of ocean drowning. Rip currents can pull swimmers and surfers out to sea. Waves can wash people off beaches and rocks, and capsize small boats nearshore.

Air Quality Alert issued July 3 at 2:29PM MST by NWS Phoenix AZ

The Mojave Desert AQMD has issued an air quality alert in the High Desert of San Bernardino County and Palo Verde Valley in Riverside County due to high levels of ozone (smog). The air quality alert is in effect Wednesday, July 3 through Tuesday, July 9, 2024. Elevated levels of ozone the predominant summertime pollutant are likely to result in poor air quality in the afternoon and early- evening hours. Ozone air pollution can cause respiratory health problems, including trouble breathing, asthma attacks, and lung damage. Children, older adults, and people with asthma or COPD may be more sensitive to the health effects of ozone. Air quality can change depending on time of day and weather conditions. Increased emissions of chemicals and faster ozone formation rates due to heat, along with low winds and stagnant weather can cause unusually high and persistent levels of ozone pollution. To help minimize ozone air pollution levels: * Limit the use of gasoline powered lawn and garden equipment until evening hours * Conserve electricity and set your air conditioner at a higher temperature * Try to delay trips to the gas station and the use of household chemicals until the evening Check air quality levels and take appropriate action as needed. When air quality index (AQI) levels are Unhealthy for Sensitive Groups (orange), people with heart or lung disease, pregnant women, children, and older adults should limit prolonged or heavy outdoor exertion. When air quality reaches Unhealthy (red) AQI levels, everyone may experience adverse health effects and sensitive groups should avoid prolonged time outdoors. At Very Unhealthy (purple) AQI levels, sensitive groups should avoid all outdoor physical activity and everyone else should avoid prolonged or heavy outdoor exertion. In the High Desert of San Bernardino County, to view current and forecasted air quality levels, visit the Mojave Desert Air Quality Management District website at mdaqmd.ca.gov.Additional details for this air quality advisory are available at www.mdaqmd.ca.gov/advisories. In the South Coast Air Basin and Coachella Valley, to view current and forecasted air quality levels, visit the South Coast Air Quality Management District website at aqmd.gov or download the mobile app at www.aqmd.gov/mobileapp. Additional details for this air quality alert may be available at www.aqmd.gov/advisory. To view current and forecast air quality within Imperial County visit the Imperial County Air Quality website at http://www.imperialvalleyair.org/ or follow ICAPCD on Twitter, facebook or Instagram (@county_air).

Air Quality Alert issued July 3 at 1:27PM PDT by NWS San Diego CA

The South Coast AQMD has issued an air quality alert in inland parts of the South Coast Air Basin and the Coachella Valley due to high levels of ozone (smog). The air quality alert is in effect 11 AM Wednesday through 7 PM Saturday. Elevated levels of ozone the predominant summertime pollutant are likely to result in poor air quality in the afternoon and early- evening hours. Ozone air pollution can cause respiratory health problems, including trouble breathing, asthma attacks, and lung damage. Children, older adults, and people with asthma or COPD may be more sensitive to the health effects of ozone. Exposure to particle pollution can cause serious health problems, aggravate heart and lung disease, cause asthma attacks and acute bronchitis, and increase risk of respiratory infections. People with respiratory or heart disease, older adults, and children are particularly susceptible. Air quality can change depending on time of day and weather conditions. Increased emissions of chemicals and faster ozone formation rates due to heat, along with low winds and stagnant weather can cause unusually high and persistent levels of ozone pollution. To help minimize ozone air pollution levels: * Limit the use of gasoline powered lawn and garden equipment until evening hours * Conserve electricity and set your air conditioner at a higher temperature * Try to delay trips to the gas station and the use of household chemicals until the evening To help keep indoor air clean during periods of poor air quality, close all windows and doors and run your air conditioner and/or an air purifier. If possible, do not use whole house fans or swamp coolers that bring in outside air. Avoid burning wood in your fireplace or firepit and minimize sources of indoor air pollution such as candles, incense, pan-frying, and grilling. Limit the use of gasoline powered lawn and garden equipment. Check air quality levels and take appropriate action as needed. When air quality index (AQI) levels are Unhealthy for Sensitive Groups (orange), people with heart or lung disease, pregnant women, children, and older adults should limit prolonged or heavy outdoor exertion. When air quality reaches Unhealthy (red) AQI levels, everyone may experience adverse health effects and sensitive groups should avoid prolonged time outdoors. At Very Unhealthy (purple) AQI levels, sensitive groups should avoid all outdoor physical activity and everyone else should avoid prolonged or heavy outdoor exertion. In the South Coast Air Basin and Coachella Valley, to view current and forecasted air quality levels, visit the South Coast Air Quality Management District website at aqmd.gov or download the mobile app at www.aqmd.gov/mobileapp. Additional details for this air quality alert may be available at www.aqmd.gov/advisory. In the Mojave Desert, to view current and forecasted air quality levels, visit the Mojave Desert Air Quality Management District website at mdaqmd.ca.gov. Additional details for this air quality alert may be available at www.mdaqmd.ca.gov/advisories. In Antelope Valley, to view current and forecasted air quality levels, visit the antelope Valley Air Quality Management District website at www.avaqmd.ca.gov. in San Diego County, to view current and forecasted air quality levels, visit the San Diego County Air Pollution Control District website at www.sdapcd.org/content/sdapcd/air-quality.html. Additional details for this air quality alert may be available at www.sdapcd.org/content/sdapcd/air-quality/smoke-advisory.html For the latest air quality forecasts and information, visit the website at aqmd.gov.

Air Quality Alert issued July 3 at 10:19AM PDT by NWS Los Angeles/Oxnard CA

...AIR QUALITY ALERT IN EFFECT FOR ELEVATED OZONE FROM 11 AM WEDNESDAY TO 7 PM PDT SATURDAY... The South Coast Air Quality Management District has issued an Air Quality Alert due to elevated ozone air pollution. This Air Quality Alert is in effect from 11 AM Wednesday to 7 PM PDT Saturday. Elevated levels of ozone the predominant summertime pollutant are likely to result in poor air quality in the afternoon and early- evening hours. Ozone air pollution can cause respiratory health problems, including trouble breathing, asthma attacks, and lung damage. Children, older adults, and people with asthma or COPD may be more sensitive to the health effects of ozone. Air quality can change depending on time of day and weather conditions. Increased emissions of chemicals and faster ozone formation rates due to heat, along with low winds and stagnant weather can cause unusually high and persistent levels of ozone pollution. To help minimize ozone air pollution levels: - Limit the use of gasoline powered lawn and garden equipment until the evening hours - Conserve electricity and set your air conditioner at a higher temperature - Try to delay trips to the gas station and the use of household chemicals until the evening Check air quality levels and take appropriate action as needed. When air quality index (AQI) levels are Unhealthy for Sensitive Groups (orange), people with heart or lung disease, pregnant women, children, and older adults should limit prolonged or heavy outdoor exertion. When air quality reaches Unhealthy (red) AQI levels, everyone may experience adverse health effects and sensitive groups should avoid prolonged time outdoors. At Very Unhealthy (purple) AQI levels, sensitive groups should avoid all outdoor physical activity and everyone else should avoid prolonged or heavy outdoor exertion. To view current and forecasted air quality levels, visit the South Coast Air Quality Management District website at aqmd.gov or download the mobile app at www.aqmd.gov/mobileapp. Additional details for this air quality alert may be available at www.aqmd.gov/advisory. For the additional information, call the South Coast Air Quality Management District.

Air Quality Alert issued July 3 at 10:19AM PDT by NWS Los Angeles/Oxnard CA

...AIR QUALITY ALERT DUE TO ELEVATED LEVELS OF FINE PARTICLE POLLUTION... The South Coast AQMD has issued an air quality alert in the South Coast Air Basin due to high levels of fine particle pollution. The air quality alert is in effect from 5 PM Thursday through Friday evening. Exposure to particle pollution can cause serious health problems, aggravate heart and lung disease, cause asthma attacks and acute bronchitis, and increase risk of respiratory infections. People with respiratory or heart disease, older adults, and children are particularly susceptible. Check air quality levels and take appropriate action as needed. When air quality index (AQI) levels are Unhealthy for Sensitive Groups (orange), people with heart or lung disease, pregnant women, children, and older adults should limit prolonged or heavy outdoor exertion. When air quality reaches Unhealthy (red) AQI levels, everyone may experience adverse health effects and sensitive groups should avoid prolonged time outdoors. At Very Unhealthy (purple) AQI levels, sensitive groups should avoid all outdoor physical activity and everyone else should avoid prolonged or heavy outdoor exertion. To help keep indoor air clean during periods of poor air quality, close all windows and doors and run your air conditioner and/or an air purifier. If possible, do not use whole house fans or swamp coolers that bring in outside air. Avoid burning wood in your fireplace or firepit and minimize sources of indoor air pollution such as candles, incense, pan-frying, and grilling. Limit the use of gasoline powered lawn and garden equipment. To view current and forecasted air quality levels, visit the South Coast Air Quality Management District website at aqmd.gov or download the mobile app at www.aqmd.gov/mobileapp. Additional details for this air quality alert may be available at www.aqmd.gov/advisory. To view current and forecasted air quality levels, visit the San Diego County Air Pollution Control District website at www.sdapcd.org/content/sdapcd/air-quality.html. Additional details for this air quality alert may be available at www.sdapcd.org/content/sdapcd/air-quality/smoke-advisory.html

Air Quality Alert issued July 3 at 9:58AM PDT by NWS San Diego CA

The South Coast AQMD has issued an air quality alert in inland parts of the South Coast Air Basin and the Coachella Valley due to high levels of ozone (smog). The air quality alert is in effect 11 AM Wednesday through 7 PM Saturday. Elevated levels of ozone the predominant summertime pollutant are likely to result in poor air quality in the afternoon and early- evening hours. Ozone air pollution can cause respiratory health problems, including trouble breathing, asthma attacks, and lung damage. Children, older adults, and people with asthma or COPD may be more sensitive to the health effects of ozone. Exposure to particle pollution can cause serious health problems, aggravate heart and lung disease, cause asthma attacks and acute bronchitis, and increase risk of respiratory infections. People with respiratory or heart disease, older adults, and children are particularly susceptible. Air quality can change depending on time of day and weather conditions. Increased emissions of chemicals and faster ozone formation rates due to heat, along with low winds and stagnant weather can cause unusually high and persistent levels of ozone pollution. To help minimize ozone air pollution levels: * Limit the use of gasoline powered lawn and garden equipment until evening hours * Conserve electricity and set your air conditioner at a higher temperature * Try to delay trips to the gas station and the use of household chemicals until the evening To help keep indoor air clean during periods of poor air quality, close all windows and doors and run your air conditioner and/or an air purifier. If possible, do not use whole house fans or swamp coolers that bring in outside air. Avoid burning wood in your fireplace or firepit and minimize sources of indoor air pollution such as candles, incense, pan-frying, and grilling. Limit the use of gasoline powered lawn and garden equipment. Check air quality levels and take appropriate action as needed. When air quality index (AQI) levels are Unhealthy for Sensitive Groups (orange), people with heart or lung disease, pregnant women, children, and older adults should limit prolonged or heavy outdoor exertion. When air quality reaches Unhealthy (red) AQI levels, everyone may experience adverse health effects and sensitive groups should avoid prolonged time outdoors. At Very Unhealthy (purple) AQI levels, sensitive groups should avoid all outdoor physical activity and everyone else should avoid prolonged or heavy outdoor exertion. In the South Coast Air Basin and Coachella Valley, to view current and forecasted air quality levels, visit the South Coast Air Quality Management District website at aqmd.gov or download the mobile app at www.aqmd.gov/mobileapp. Additional details for this air quality alert may be available at www.aqmd.gov/advisory. In the Mojave Desert, to view current and forecasted air quality levels, visit the Mojave Desert Air Quality Management District website at mdaqmd.ca.gov. Additional details for this air quality alert may be available at www.mdaqmd.ca.gov/advisories. In Antelope Valley, to view current and forecasted air quality levels, visit the antelope Valley Air Quality Management District website at www.avaqmd.ca.gov. in San Diego County, to view current and forecasted air quality levels, visit the San Diego County Air Pollution Control District website at www.sdapcd.org/content/sdapcd/air-quality.html. Additional details for this air quality alert may be available at www.sdapcd.org/content/sdapcd/air-quality/smoke-advisory.html For the latest air quality forecasts and information, visit the website at aqmd.gov.

Air Quality Alert issued July 2 at 5:40PM PDT by NWS San Diego CA

The South Coast AQMD has issued an air quality alert in inland parts of the South Coast Air Basin and the Coachella Valley due to high levels of ozone (smog). The air quality alert is in effect 11 AM Wednesday through 7 PM Saturday. Elevated levels of ozone the predominant summertime pollutant are likely to result in poor air quality in the afternoon and early- evening hours. Ozone air pollution can cause respiratory health problems, including trouble breathing, asthma attacks, and lung damage. Children, older adults, and people with asthma or COPD may be more sensitive to the health effects of ozone. Air quality can change depending on time of day and weather conditions. Increased emissions of chemicals and faster ozone formation rates due to heat, along with low winds and stagnant weather can cause unusually high and persistent levels of ozone pollution. To help minimize ozone air pollution levels: * Limit the use of gasoline powered lawn and garden equipment until evening hours * Conserve electricity and set your air conditioner at a higher temperature * Try to delay trips to the gas station and the use of household chemicals until the evening Check air quality levels and take appropriate action as needed. When air quality index (AQI) levels are Unhealthy for Sensitive Groups (orange), people with heart or lung disease, pregnant women, children, and older adults should limit prolonged or heavy outdoor exertion. When air quality reaches Unhealthy (red) AQI levels, everyone may experience adverse health effects and sensitive groups should avoid prolonged time outdoors. At Very Unhealthy (purple) AQI levels, sensitive groups should avoid all outdoor physical activity and everyone else should avoid prolonged or heavy outdoor exertion. In the South Coast Air Basin and Coachella Valley, to view current and forecasted air quality levels, visit the South Coast Air Quality Management District website at aqmd.gov or download the mobile app at www.aqmd.gov/mobileapp. Additional details for this air quality alert may be available at www.aqmd.gov/advisory. In the Mojave Desert, to view current and forecasted air quality levels, visit the Mojave Desert Air Quality Management District website at mdaqmd.ca.gov. Additional details for this air quality alert may be available at www.mdaqmd.ca.gov/advisories. In Antelope Valley, to view current and forecasted air quality levels, visit the antelope Valley Air Quality Management District website at www.avaqmd.ca.gov. in San Diego County, to view current and forecasted air quality levels, visit the San Diego County Air Pollution Control District website at www.sdapcd.org/content/sdapcd/air-quality.html. Additional details for this air quality alert may be available at www.sdapcd.org/content/sdapcd/air-quality/smoke-advisory.html For the latest air quality forecasts and information, visit the website at aqmd.gov.

Air Quality Alert issued July 2 at 5:19PM PDT by NWS Los Angeles/Oxnard CA

The South Coast Air Quality Management District has issued an Air Quality Alert due to elevated ozone air pollution. This Air Quality Alert is in effect from 11 AM Wednesday to 7 PM PDT Saturday. Elevated levels of ozone the predominant summertime pollutant are likely to result in poor air quality in the afternoon and early- evening hours. Ozone air pollution can cause respiratory health problems, including trouble breathing, asthma attacks, and lung damage. Children, older adults, and people with asthma or COPD may be more sensitive to the health effects of ozone. Air quality can change depending on time of day and weather conditions. Increased emissions of chemicals and faster ozone formation rates due to heat, along with low winds and stagnant weather can cause unusually high and persistent levels of ozone pollution. To help minimize ozone air pollution levels: - Limit the use of gasoline powered lawn and garden equipment until the evening hours - Conserve electricity and set your air conditioner at a higher temperature - Try to delay trips to the gas station and the use of household chemicals until the evening Check air quality levels and take appropriate action as needed. When air quality index (AQI) levels are Unhealthy for Sensitive Groups (orange), people with heart or lung disease, pregnant women, children, and older adults should limit prolonged or heavy outdoor exertion. When air quality reaches Unhealthy (red) AQI levels, everyone may experience adverse health effects and sensitive groups should avoid prolonged time outdoors. At Very Unhealthy (purple) AQI levels, sensitive groups should avoid all outdoor physical activity and everyone else should avoid prolonged or heavy outdoor exertion. To view current and forecasted air quality levels, visit the South Coast Air Quality Management District website at aqmd.gov or download the mobile app at www.aqmd.gov/mobileapp. Additional details for this air quality alert may be available at www.aqmd.gov/advisory. For the additional information, call the South Coast Air Quality Management District.