Harmony, 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 Harmony.

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

Severe Thunderstorm Warning issued September 7 at 5:36PM PDT until September 7 at 5:45PM PDT by NWS Phoenix AZ

At 536 PM PDT, a severe thunderstorm was located 8 miles northeast of Cottonwood Visitor, or 13 miles north of Chiriaco Summit, moving south at 5 mph. HAZARD...60 mph wind gusts. SOURCE...Radar indicated. IMPACT...Expect damage to roofs, siding, and trees. This severe thunderstorm will remain over mainly rural areas of Riverside County.

Flood Advisory issued September 7 at 5:33PM PDT until September 7 at 6:15PM PDT by NWS Phoenix AZ

* WHAT...Flooding caused by excessive rainfall continues. * WHERE...A portion of southern California, including the following counties, Riverside and San Bernardino. * WHEN...Until 615 PM PDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Water over roadways. * ADDITIONAL DETAILS... - At 533 PM PDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 1 and 2 inches of rain have fallen. - Flooding impacts will continue, but no additional rainfall is expected. - Some locations that will experience flooding include... mainly rural areas of Riverside and San Bernardino Counties - http://www.weather.gov/safety/flood

Flood Advisory issued September 7 at 5:22PM PDT until September 7 at 8:30PM PDT by NWS Phoenix AZ

* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...A portion of southern California, including the following county, Riverside. * WHEN...Until 830 PM PDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 522 PM PDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 1 and 1.5 inches of rain have fallen. - Additional rainfall amounts up to 1 inch are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Eagle Mtn. - http://www.weather.gov/safety/flood

Flood Advisory issued September 7 at 5:14PM PDT until September 7 at 8:15PM PDT by NWS Las Vegas NV

* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...A portion of southern California, including the following county, San Bernardino. * WHEN...Until 815 PM PDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. Dangerous flows over low-water crossings. * ADDITIONAL DETAILS... - At 511 PM PDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Up to 1 inch of rain has fallen. - Some locations that will experience flooding include... Essex and Highway 95 And Goffs Road. - http://www.weather.gov/safety/flood

Air Quality Alert issued September 7 at 4:45PM PDT by NWS Los Angeles/Oxnard CA

The South Coast AQMD has extended an air quality alert in the South Coast Air Basin due to high levels of ozone (smog) due to the ongoing heat wave and updated an air quality alert due to increased fine particle pollution from wildfire smoke in the region. The air quality alert is in effect until Monday evening for smog and Sunday evening for wildfire smoke. 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 If you smell smoke or see ash due to a wildfire, remain indoors with windows and doors closed or seek alternative shelter, if feasible. Avoid vigorous physical activity 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. If you must be outdoors, keep the time brief and wear a tightly-fitted N-95 or P- 100 respirator to help reduce exposure. Limit the use of gasoline powered lawn and garden equipment. Exposure to particle pollution can cause serious health problems, aggravate lung disease, cause asthma attacks and acute bronchitis, and increase risk of respiratory infections. People with heart or lung diseases should follow their doctor's advice for dealing with episodes of unhealthy air quality. Additionally, people with respiratory or heart disease, older adults, and children are particularly susceptible and should avoid prolonged exposure, strenuous activities or heavy exertion as conditions dictate. Levels of particle pollution can vary hour by hour and by location depending on fire behavior and local weather conditions. 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.

Air Quality Alert issued September 7 at 4:45PM PDT by NWS Los Angeles/Oxnard CA

The South Coast Air Quality Management District has issued an Air Quality Alert due to elevated fine particulate matter levels due to wildfire smoke and high ozone levels. This Air Quality Alert is IN EFFECT UNTIL 8 PM PDT MONDAY The South Coast AQMD has extended an air quality alert in the South Coast Air Basin due to high levels of ozone (smog) due to the ongoing heat wave and updated an air quality alert due to increased fine particle pollution from wildfire smoke in the region. The air quality alert is in effect until Monday evening for smog and Sunday evening for wildfire smoke. 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 If you smell smoke or see ash due to a wildfire, remain indoors with windows and doors closed or seek alternative shelter, if feasible. Avoid vigorous physical activity 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. If you must be outdoors, keep the time brief and wear a tightly-fitted N-95 or P- 100 respirator to help reduce exposure. Limit the use of gasoline powered lawn and garden equipment. Exposure to particle pollution can cause serious health problems, aggravate lung disease, cause asthma attacks and acute bronchitis, and increase risk of respiratory infections. People with heart or lung diseases should follow their doctor's advice for dealing with episodes of unhealthy air quality. Additionally, people with respiratory or heart disease, older adults, and children are particularly susceptible and should avoid prolonged exposure, strenuous activities or heavy exertion as conditions dictate. Levels of particle pollution can vary hour by hour and by location depending on fire behavior and local weather conditions. 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.

Air Quality Alert issued September 7 at 4:31PM PDT by NWS San Diego CA

The South Coast AQMD has extended the air quality alert in the South Coast Air Basin due to high levels of ozone (smog) and increased fine particle pollution from wildfire smoke in the region. The air quality alert is in effect until Monday evening for smog and Sunday evening for wildfire smoke. High ozone levels are expected to impact most of the South Coast Air Basin. Smoke is expected to impact the Inland Empire and the San Bernardino Mountains. 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. For the latest air quality forecasts and information, visit the website at aqmd.gov.

Flood Advisory issued September 7 at 4:19PM PDT until September 7 at 7:30PM PDT by NWS Phoenix AZ

* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...A portion of southern California, including the following county, Riverside. * WHEN...Until 730 PM PDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 418 PM PDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 1 and 1.5 inches of rain have fallen. - Additional rainfall amounts of 0.5 to 1 inch are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Desert Center. - http://www.weather.gov/safety/flood

Flood Advisory issued September 7 at 3:57PM PDT until September 7 at 5:57PM PDT by NWS San Diego CA

* WHAT...Flooding caused by excessive rainfall is expected. * WHERE...A portion of Southwest California, including the following county, Riverside. * WHEN...Until 557 PM PDT. * IMPACTS...Minor flooding in low-lying and poor drainage areas. * ADDITIONAL DETAILS... - At 357 PM PDT, Doppler radar indicated heavy rain due to thunderstorms. Minor flooding is ongoing or expected to begin shortly in the advisory area. Between 0.25 and 1 inch of rain has fallen. - Additional rainfall amounts of 0.5 to 1.5 inches are expected over the area. This additional rain will result in minor flooding. - Some locations that will experience flooding include... Perris, Menifee, Nuevo, Romoland, Lake Perris Recreation Area, Homeland, Lakeview and Juniper Springs.

Excessive Heat Warning issued September 7 at 3:51PM MST until September 8 at 8:00PM MST by NWS Phoenix AZ

* WHAT...Dangerously hot conditions. Afternoon temperatures 108 to 112. Major Heat Risk. * WHERE...In Arizona, Parker Valley and Yuma. In California, Palo Verde Valley. * WHEN...Until 8 PM MST /8 PM PDT/ Sunday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke.

Flash Flood Warning issued September 7 at 3:42PM PDT until September 7 at 6:00PM PDT by NWS Las Vegas NV

At 342 PM PDT, emergency management reported thunderstorms producing heavy rain across the warned area. Up to 2 inches of rain have fallen. Flash flooding is ongoing or expected to begin shortly. HAZARD...Life-threatening flash flooding. Thunderstorms producing flash flooding. SOURCE...Emergency management reported. IMPACT...Life-threatening flash flooding of low-water crossings, creeks, normally dry washes and roads. Some locations that will experience flash flooding include... Twentynine Palms. This includes State Route 62 in San Bernardino County between mile markers 25 and 39.

Excessive Heat Warning issued September 7 at 2:35PM PDT until September 7 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Dangerously hot conditions with temperatures up to 106. * WHERE...Antelope Valley, Eastern Antelope Valley Foothills, San Luis Obispo County Interior Valleys, San Luis Obispo County Mountains, Santa Lucia Mountains, Santa Ynez Valley, Southern Salinas Valley, and Western Antelope Valley Foothills. * WHEN...Until 8 PM PDT this evening. * IMPACTS...There is a high risk for dangerous heat illness for anyone, especially for the very young, the very old, those without air conditioning, and those active outdoors.

Heat Advisory issued September 7 at 2:35PM PDT until September 7 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Temperatures up to 88. * WHERE...San Luis Obispo County Beaches, Santa Barbara County Central Coast Beaches, and Ventura County Beaches. * WHEN...Until 8 PM PDT this evening. * IMPACTS...There is a high risk for heat illness for sensitive populations including the very young, the very old, those without air conditioning, and those active outdoors.

Heat Advisory issued September 7 at 2:35PM PDT until September 7 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Temperatures up to 97. * WHERE...San Luis Obispo County Inland Central Coast and Santa Barbara County Inland Central Coast. * WHEN...Until 8 PM PDT this evening. * IMPACTS...There is a high risk for heat illness for sensitive populations including the very young, the very old, those without air conditioning, and those active outdoors.

Wind Advisory issued September 7 at 2:35PM PDT until September 8 at 3:00AM PDT by NWS Los Angeles/Oxnard CA

* WHAT...For the Excessive Heat Warning, dangerously hot conditions with temperatures up to 105. For the Wind Advisory, northwest winds 15 to 25 mph with gusts up to 40 mph expected. * WHERE...Santa Ynez Mountains Eastern Range and Santa Ynez Mountains Western Range. * WHEN...For the Excessive Heat Warning, until 8 PM PDT Monday. For the Wind Advisory, until 3 AM PDT Sunday. * IMPACTS...There is a high risk for dangerous heat illness for anyone, especially for the very young, the very old, those without air conditioning, and those active outdoors. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Wind Advisory issued September 7 at 2:35PM PDT until September 8 at 3:00AM PDT by NWS Los Angeles/Oxnard CA

* WHAT...For the Heat Advisory, temperatures up to 97. For the Wind Advisory, north winds 20 to 30 mph with gusts up to 40 mph expected. * WHERE...Santa Barbara County Southwestern Coast. * WHEN...For the Heat Advisory, until 8 PM PDT Monday. For the Wind Advisory, until 3 AM PDT Sunday. * IMPACTS...There is a high risk for heat illness for sensitive populations including the very young, the very old, those without air conditioning, and those active outdoors. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Excessive Heat Warning issued September 7 at 2:35PM PDT until September 9 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...For the Excessive Heat Warning, dangerously hot conditions with temperatures up to 105. For the Wind Advisory, northwest winds 15 to 25 mph with gusts up to 40 mph expected. * WHERE...Santa Ynez Mountains Eastern Range and Santa Ynez Mountains Western Range. * WHEN...For the Excessive Heat Warning, until 8 PM PDT Monday. For the Wind Advisory, until 3 AM PDT Sunday. * IMPACTS...There is a high risk for dangerous heat illness for anyone, especially for the very young, the very old, those without air conditioning, and those active outdoors. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Heat Advisory issued September 7 at 2:35PM PDT until September 9 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Temperatures up to 96. * WHERE...Santa Barbara County Southeastern Coast and Ventura County Inland Coast. * WHEN...Until 8 PM PDT Monday. * IMPACTS...There is a high risk for heat illness for sensitive populations including the very young, the very old, those without air conditioning, and those active outdoors.

Excessive Heat Warning issued September 7 at 2:35PM PDT until September 9 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Dangerously hot conditions with temperatures up to 105. * WHERE...A portion of southwest California. * WHEN...Until 8 PM PDT Monday. * IMPACTS...There is a high risk for dangerous heat illness for anyone, especially for the very young, the very old, those without air conditioning, and those active outdoors.

Heat Advisory issued September 7 at 2:35PM PDT until September 9 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...For the Heat Advisory, temperatures up to 97. For the Wind Advisory, north winds 20 to 30 mph with gusts up to 40 mph expected. * WHERE...Santa Barbara County Southwestern Coast. * WHEN...For the Heat Advisory, until 8 PM PDT Monday. For the Wind Advisory, until 3 AM PDT Sunday. * IMPACTS...There is a high risk for heat illness for sensitive populations including the very young, the very old, those without air conditioning, and those active outdoors. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Excessive Heat Warning issued September 7 at 2:35PM PDT until September 9 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Dangerously hot conditions with temperatures up to 113. * WHERE...Western San Fernando Valley. * WHEN...Until 8 PM PDT Monday. * IMPACTS...There is a high risk for dangerous heat illness for anyone, especially for the very young, the very old, those without air conditioning, and those active outdoors.

Excessive Heat Warning issued September 7 at 2:35PM PDT until September 9 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Dangerously hot conditions with temperatures up to 96. * WHERE...Los Angeles County Beaches, Malibu Coast, and Palos Verdes Hills. * WHEN...Until 8 PM PDT Monday. * IMPACTS...There is a high risk for dangerous heat illness for anyone, especially for the very young, the very old, those without air conditioning, and those active outdoors.

Red Flag Warning issued September 7 at 2:10PM PDT until September 7 at 10:00PM PDT by NWS Los Angeles/Oxnard CA

...RED FLAG WARNING IN EFFECT THROUGH 10 PM THIS EVENING FOR SAN LUIS OBISPO COUNTY MOUNTAINS (INCLUDING THE SANTA LUCIA RANGE), SANTA MONICA MOUNTAINS, AND EASTERN SANTA YNEZ RANGE AND ADJACENT SOUTHEAST COAST OF SANTA BARBARA COUNTY DUE TO EXTREMELY HOT AND DRY CONDITIONS, LOCALLY GUSTY WINDS... ...RED FLAG WARNING EXTENDED UNTIL 10 PM SUNDAY FOR THE INTERIOR MOUNTAINS OF LOS ANGELES, VENTURA, AND SANTA BARBARA COUNTIES (INCLUDING THE SANTA SUSANA MOUNTAINS), ANTELOPE VALLEY, AND WESTERN SANTA YNEZ RANGE AND ADJACENT SOUTHWEST COAST OF SANTA BARBARA COUNTY DUE TO HOT AND DRY CONDITIONS, LOCALLY GUSTY WINDS, AND POTENTIAL DRY LIGHTNING... .A long duration heat wave will continue away from the immediate coast, with only minor and slow improvement through Monday. Near record high temperatures will continue this weekend with highs between 105 and 115 common over the valleys, lower mountains, and deserts, and 95 to 105 over the inland coastal plain. Very warm temperatures will persist at night across the mountains and foothills. Locally gusty winds will form as well, strongest over southern Santa Barbara County with Sundowner gusts between 25 and 40 mph each night through Monday. There will be increasing instability today and Sunday, leading to deep mixing heights up to 18,000 feet, which will also lead to a high risk for erratic plume-dominated fire behavior, especially in the mountains, foothills, and deserts. While standard Red Flag Warning criteria is unlikely, there is a history of large fires during similar weather conditions. There is a threat of thunderstorms this weekend as mid level monsoonal moisture and instability move into the region. The best chance of storms will be across the mountains of Los Angeles and Ventura counties, as well as the Antelope Valley through Sunday. Any storms that develop today and Sunday will have the potential for dry lightning strikes and strong/erratic downburst winds, with localized gusts to 50 mph possible. Due to the significant threat of large plume dominated fires and the risk of dry lightning and additional sundowner winds, the Red Flag Warning has been extended into Sunday evening for portions of the warning area. * WINDS...North 15 to 30 mph with gusts up to 40 mph, strongest at nighT in the hills. Gusty and erratic winds possible with any new fires. * RELATIVE HUMIDITY...Minimums 8 to 15 percent inland of the beaches. Poor to minimal overnight recoveries of 12 to 25 percent in the foothills and mountains. * TEMPERATURES...Maximums between 98 and 108 common in the foothills and mountains, with minimums between 80 and 90. * IMPACTS...If fire ignition occurs, conditions are favorable for rapid fire spread and extreme fire behavior which would threaten life and property.

Red Flag Warning issued September 7 at 2:10PM PDT until September 7 at 10:00PM PDT by NWS Los Angeles/Oxnard CA

...RED FLAG WARNING IN EFFECT THROUGH 10 PM THIS EVENING FOR SAN LUIS OBISPO COUNTY MOUNTAINS (INCLUDING THE SANTA LUCIA RANGE), SANTA MONICA MOUNTAINS, AND EASTERN SANTA YNEZ RANGE AND ADJACENT SOUTHEAST COAST OF SANTA BARBARA COUNTY DUE TO EXTREMELY HOT AND DRY CONDITIONS, LOCALLY GUSTY WINDS... ...RED FLAG WARNING EXTENDED UNTIL 10 PM SUNDAY FOR THE INTERIOR MOUNTAINS OF LOS ANGELES, VENTURA, AND SANTA BARBARA COUNTIES (INCLUDING THE SANTA SUSANA MOUNTAINS), ANTELOPE VALLEY, AND WESTERN SANTA YNEZ RANGE AND ADJACENT SOUTHWEST COAST OF SANTA BARBARA COUNTY DUE TO HOT AND DRY CONDITIONS, LOCALLY GUSTY WINDS, AND POTENTIAL DRY LIGHTNING... .A long duration heat wave will continue away from the immediate coast, with only minor and slow improvement through Monday. Near record high temperatures will continue this weekend with highs between 105 and 115 common over the valleys, lower mountains, and deserts, and 95 to 105 over the inland coastal plain. Very warm temperatures will persist at night across the mountains and foothills. Locally gusty winds will form as well, strongest over southern Santa Barbara County with Sundowner gusts between 25 and 40 mph each night through Monday. There will be increasing instability today and Sunday, leading to deep mixing heights up to 18,000 feet, which will also lead to a high risk for erratic plume-dominated fire behavior, especially in the mountains, foothills, and deserts. While standard Red Flag Warning criteria is unlikely, there is a history of large fires during similar weather conditions. There is a threat of thunderstorms this weekend as mid level monsoonal moisture and instability move into the region. The best chance of storms will be across the mountains of Los Angeles and Ventura counties, as well as the Antelope Valley through Sunday. Any storms that develop today and Sunday will have the potential for dry lightning strikes and strong/erratic downburst winds, with localized gusts to 50 mph possible. Due to the significant threat of large plume dominated fires and the risk of dry lightning and additional sundowner winds, the Red Flag Warning has been extended into Sunday evening for portions of the warning area. * WINDS...West to north winds 10 to 15 mph with gusts up to 30 mph. Gusty and erratic winds possible with any new fires or thunderstorms. * RELATIVE HUMIDITY...Minimums 8 to 18 percent. Poor overnight recoveries of 15 to 30 percent. * TEMPERATURES...Maximums between 98 and 110 common for lower elevations, with minimums between 80 and 90. * IMPACTS...If fire ignition occurs, conditions are favorable for rapid fire spread and extreme fire behavior which would threaten life and property.

Red Flag Warning issued September 7 at 2:10PM PDT until September 8 at 10:00PM PDT by NWS Los Angeles/Oxnard CA

...RED FLAG WARNING IN EFFECT THROUGH 10 PM THIS EVENING FOR SAN LUIS OBISPO COUNTY MOUNTAINS (INCLUDING THE SANTA LUCIA RANGE), SANTA MONICA MOUNTAINS, AND EASTERN SANTA YNEZ RANGE AND ADJACENT SOUTHEAST COAST OF SANTA BARBARA COUNTY DUE TO EXTREMELY HOT AND DRY CONDITIONS, LOCALLY GUSTY WINDS... ...RED FLAG WARNING EXTENDED UNTIL 10 PM SUNDAY FOR THE INTERIOR MOUNTAINS OF LOS ANGELES, VENTURA, AND SANTA BARBARA COUNTIES (INCLUDING THE SANTA SUSANA MOUNTAINS), ANTELOPE VALLEY, AND WESTERN SANTA YNEZ RANGE AND ADJACENT SOUTHWEST COAST OF SANTA BARBARA COUNTY DUE TO HOT AND DRY CONDITIONS, LOCALLY GUSTY WINDS, AND POTENTIAL DRY LIGHTNING... .A long duration heat wave will continue away from the immediate coast, with only minor and slow improvement through Monday. Near record high temperatures will continue this weekend with highs between 105 and 115 common over the valleys, lower mountains, and deserts, and 95 to 105 over the inland coastal plain. Very warm temperatures will persist at night across the mountains and foothills. Locally gusty winds will form as well, strongest over southern Santa Barbara County with Sundowner gusts between 25 and 40 mph each night through Monday. There will be increasing instability today and Sunday, leading to deep mixing heights up to 18,000 feet, which will also lead to a high risk for erratic plume-dominated fire behavior, especially in the mountains, foothills, and deserts. While standard Red Flag Warning criteria is unlikely, there is a history of large fires during similar weather conditions. There is a threat of thunderstorms this weekend as mid level monsoonal moisture and instability move into the region. The best chance of storms will be across the mountains of Los Angeles and Ventura counties, as well as the Antelope Valley through Sunday. Any storms that develop today and Sunday will have the potential for dry lightning strikes and strong/erratic downburst winds, with localized gusts to 50 mph possible. Due to the significant threat of large plume dominated fires and the risk of dry lightning and additional sundowner winds, the Red Flag Warning has been extended into Sunday evening for portions of the warning area. * WINDS...North 15 to 30 mph with gusts up to 45 mph, strongest at night. Gusty and erratic winds possible with any new fires. * RELATIVE HUMIDITY...Minimums 8 to 18 percent inland of the beaches. Poor to minimal overnight recoveries of 12 to 25 percent in the foothills and mountains. * TEMPERATURES...Maximums between 98 and 108 common in the foothills and mountains, with minimums between 80 and 90. * IMPACTS...If fire ignition occurs, conditions are favorable for rapid fire spread and extreme fire behavior which would threaten life and property.

Red Flag Warning issued September 7 at 2:10PM PDT until September 8 at 10:00PM PDT by NWS Los Angeles/Oxnard CA

...RED FLAG WARNING IN EFFECT THROUGH 10 PM THIS EVENING FOR SAN LUIS OBISPO COUNTY MOUNTAINS (INCLUDING THE SANTA LUCIA RANGE), SANTA MONICA MOUNTAINS, AND EASTERN SANTA YNEZ RANGE AND ADJACENT SOUTHEAST COAST OF SANTA BARBARA COUNTY DUE TO EXTREMELY HOT AND DRY CONDITIONS, LOCALLY GUSTY WINDS... ...RED FLAG WARNING EXTENDED UNTIL 10 PM SUNDAY FOR THE INTERIOR MOUNTAINS OF LOS ANGELES, VENTURA, AND SANTA BARBARA COUNTIES (INCLUDING THE SANTA SUSANA MOUNTAINS), ANTELOPE VALLEY, AND WESTERN SANTA YNEZ RANGE AND ADJACENT SOUTHWEST COAST OF SANTA BARBARA COUNTY DUE TO HOT AND DRY CONDITIONS, LOCALLY GUSTY WINDS, AND POTENTIAL DRY LIGHTNING... .A long duration heat wave will continue away from the immediate coast, with only minor and slow improvement through Monday. Near record high temperatures will continue this weekend with highs between 105 and 115 common over the valleys, lower mountains, and deserts, and 95 to 105 over the inland coastal plain. Very warm temperatures will persist at night across the mountains and foothills. Locally gusty winds will form as well, strongest over southern Santa Barbara County with Sundowner gusts between 25 and 40 mph each night through Monday. There will be increasing instability today and Sunday, leading to deep mixing heights up to 18,000 feet, which will also lead to a high risk for erratic plume-dominated fire behavior, especially in the mountains, foothills, and deserts. While standard Red Flag Warning criteria is unlikely, there is a history of large fires during similar weather conditions. There is a threat of thunderstorms this weekend as mid level monsoonal moisture and instability move into the region. The best chance of storms will be across the mountains of Los Angeles and Ventura counties, as well as the Antelope Valley through Sunday. Any storms that develop today and Sunday will have the potential for dry lightning strikes and strong/erratic downburst winds, with localized gusts to 50 mph possible. Due to the significant threat of large plume dominated fires and the risk of dry lightning and additional sundowner winds, the Red Flag Warning has been extended into Sunday evening for portions of the warning area. * WINDS...West to north winds 10 to 15 mph with gusts up to 30 mph. Gusty and erratic winds possible with any new fires or thunderstorms. * RELATIVE HUMIDITY...Minimums 8 to 18 percent. Poor overnight recoveries of 15 to 30 percent. * TEMPERATURES...Maximums between 100 and 110 common for lower elevations, with minimums between 80 and 90. * THUNDERSTORMS...There is an increasing risk for dry lightning over Los Angeles and Ventura Counties this weekend, which can start new fires, spread them rapidly with gusty downburst winds, and provide little if any extinguishing rain. * IMPACTS...If fire ignition occurs, conditions are favorable for rapid fire spread and extreme fire behavior which would threaten life and property.

Red Flag Warning issued September 7 at 2:10PM PDT until September 8 at 10:00PM PDT by NWS Los Angeles/Oxnard CA

...RED FLAG WARNING IN EFFECT THROUGH 10 PM THIS EVENING FOR SAN LUIS OBISPO COUNTY MOUNTAINS (INCLUDING THE SANTA LUCIA RANGE), SANTA MONICA MOUNTAINS, AND EASTERN SANTA YNEZ RANGE AND ADJACENT SOUTHEAST COAST OF SANTA BARBARA COUNTY DUE TO EXTREMELY HOT AND DRY CONDITIONS, LOCALLY GUSTY WINDS... ...RED FLAG WARNING EXTENDED UNTIL 10 PM SUNDAY FOR THE INTERIOR MOUNTAINS OF LOS ANGELES, VENTURA, AND SANTA BARBARA COUNTIES (INCLUDING THE SANTA SUSANA MOUNTAINS), ANTELOPE VALLEY, AND WESTERN SANTA YNEZ RANGE AND ADJACENT SOUTHWEST COAST OF SANTA BARBARA COUNTY DUE TO HOT AND DRY CONDITIONS, LOCALLY GUSTY WINDS, AND POTENTIAL DRY LIGHTNING... .A long duration heat wave will continue away from the immediate coast, with only minor and slow improvement through Monday. Near record high temperatures will continue this weekend with highs between 105 and 115 common over the valleys, lower mountains, and deserts, and 95 to 105 over the inland coastal plain. Very warm temperatures will persist at night across the mountains and foothills. Locally gusty winds will form as well, strongest over southern Santa Barbara County with Sundowner gusts between 25 and 40 mph each night through Monday. There will be increasing instability today and Sunday, leading to deep mixing heights up to 18,000 feet, which will also lead to a high risk for erratic plume-dominated fire behavior, especially in the mountains, foothills, and deserts. While standard Red Flag Warning criteria is unlikely, there is a history of large fires during similar weather conditions. There is a threat of thunderstorms this weekend as mid level monsoonal moisture and instability move into the region. The best chance of storms will be across the mountains of Los Angeles and Ventura counties, as well as the Antelope Valley through Sunday. Any storms that develop today and Sunday will have the potential for dry lightning strikes and strong/erratic downburst winds, with localized gusts to 50 mph possible. Due to the significant threat of large plume dominated fires and the risk of dry lightning and additional sundowner winds, the Red Flag Warning has been extended into Sunday evening for portions of the warning area. * WINDS...West winds 15 to 20 mph with gusts up to 30 mph, except locally stronger and erratic winds near any new fires or thunderstorms. * RELATIVE HUMIDITY...Minimums 8 to 12 percent. Poor overnight recoveries of 15 to 30 percent. * TEMPERATURES...Maximums between 105 and 108 are expected. * THUNDERSTORMS...There is an increasing risk for dry lightning over the Antelope Valley through Sunday evening, especially eastern portions, which can start new fires, spread them rapidly with gusty downburst winds, and provide little if any extinguishing rain. Any thunderstorms that develop over the Antelope Valley or nearby areas, will have the potential to produce strong and erratic outflow wind gusts to 50 mph. * IMPACTS...If fire ignition occurs, conditions are favorable for rapid fire spread and extreme fire behavior which would threaten life and property.

Excessive Heat Warning issued September 7 at 1:36PM PDT until September 9 at 8:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with high temperatures in the 90s to 104 expected. Warm nights with low temperatures in the mid to upper 70s. * WHERE...Santa Ana Mountains and Foothills. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS... A very slow cooling trend will occur Sunday and Monday, but temperatures will remain 5 to 8 degrees above normal.

Heat Advisory issued September 7 at 1:36PM PDT until September 9 at 8:00PM PDT by NWS San Diego CA

* WHAT...High temperatures in the mid 80s at the beaches to the 90s and near 100 a few miles inland. Temperatures 83 to 95 degrees. Warmest conditions expected away from the immediate coast. * WHERE...Orange County Coastal Areas. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Hot temperatures may cause heat illnesses.

Excessive Heat Warning issued September 7 at 1:36PM PDT until September 9 at 8:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with high temperatures of 102 to 110. Very warm nights with lowest temperatures only falling into the mid to upper 70s. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...A very slow cooling trend will occur Sunday and Monday, but temperatures will remain 8-12 degrees above normal.

Heat Advisory issued September 7 at 1:36PM PDT until September 9 at 8:00PM PDT by NWS San Diego CA

* WHAT...High temperatures in the mid 80s near the coast to the 90s and near 100 degrees a few miles inland. * WHERE...San Diego County Coastal Areas. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Hot temperatures may cause heat illnesses.

Excessive Heat Warning issued September 7 at 1:36PM PDT until September 9 at 8:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with high temperatures of 102 to 110. Very warm nights with lowest temperatures only falling into the 70s. * WHERE...San Diego County Valleys. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...A very slow cooling trend will occur Sunday and Monday, but temperatures will remain 10-15 degrees above normal.

Excessive Heat Warning issued September 7 at 1:36PM PDT until September 9 at 8:00PM PDT by NWS San Diego CA

* WHAT...Dangerously hot conditions with high temperatures in the mid 90s to 106 expected. Warm nights with low temperatures in the lower to mid 70s. * WHERE...Orange County Inland Areas. * WHEN...Until 8 PM PDT Monday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS... A very slow cooling trend will occur Sunday and Monday, but temperatures will remain 10-15 degrees above normal.

Excessive Heat Warning issued September 7 at 11:45AM PDT until September 7 at 8:00PM PDT by NWS Hanford CA

* WHAT...Dangerously hot conditions with high temperatures of 105 to 110 degrees expected. Overnight lows as warm as the upper 70s. Moderate to major heat risk expected with some areas of extreme heat risk. * WHERE...Indian Wells Valley, Mojave Desert, and Mojave Desert Slopes. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Heat Advisory issued September 7 at 11:45AM PDT until September 7 at 8:00PM PDT by NWS Hanford CA

* WHAT...High temperatures of 102 to 107 degrees expected. Overnight lows as warm as the upper 70s. Moderate to major heat risk expected. * WHERE...The San Joaquin Valley, lower Sierra Nevada foothills, West Side Mountains, and the Kern River Valley and Lake Isabella. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Hot temperatures with little overnight relief may cause heat illnesses.

Air Quality Alert issued September 6 at 3:26PM PDT by NWS San Diego CA

The South Coast AQMD has issued an air quality alert in the South Coast Air Basi n due to high levels of ozone (smog) and increased fine particle pollution from wildfire smoke in the region. The air quality alert for smog is in effect until Monday evening. The air quality alert is in effect until Saturday afternoon. High ozone levels are expected to impact most of the South Coast Air Basin. Smok e is expected to impact the Inland Empire and the San Bernardino Mountains. 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 p ollution can cause respiratory health problems, including trouble breathing, ast hma 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. Increase d emissions of chemicals and faster ozone formation rates due to heat, along wit h low winds and stagnant weather can cause unusually high and persistent levels of ozone pollution. If you smell smoke or see ash due to a wildfire, remain indoors with windows and doors closed or seek alternative shelter, if feasible. Avoid vigorous physical activity and run your air conditioner and/or an air purifier. If possible, do no t 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. If you must be outdoors, kee p the time brief and wear a tightly-fitted N-95 or P-100 respirator to help redu ce exposure. Limit the use of gasoline powered lawn and garden equipment. Exposure to particle pollution can cause serious health problems, aggravate lung disease, cause asthma attacks and acute bronchitis, and increase risk of respir atory infections. People with heart or lung diseases should follow their doctor' s advice for dealing with episodes of unhealthy air quality. Additionally, peopl e with respiratory or heart disease, older adults, and children are particularly susceptible and should avoid prolonged exposure, strenuous activities or heavy exertion as conditions dictate. Levels of particle pollution can vary hour by hour and by location depending on fire behavior and local weather conditions. To help minimize ozone air pollution levels: - Limit the use of gasoline powered lawn and garden equipment until evening hour - 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 qualit y index (AQI) levels are Unhealthy for Sensitive Groups (orange), people with he art or lung disease, pregnant women, children, and older adults should limit pro longed or heavy outdoor exertion. When air quality reaches Unhealthy (red) AQI l evels, everyone may experience adverse health effects and sensitive groups shoul d avoid prolonged time outdoors. At Very Unhealthy (purple) AQI levels, sensitiv e groups should avoid all outdoor physical activity and everyone else should avo id prolonged or heavy outdoor exertion. To view current and forecasted air quality levels, visit the South Coast Air Qua lity Management District website at aqmd.gov or download the mobile app at www.a qmd.gov/mobileapp. Additional details for this air quality alert may be availabl e at www.aqmd.gov/advisory. To view current and forecasted air quality levels, visit the Mojave Desert Air Q uality Management District website at mdaqmd.ca.gov. Additional details for thi s air quality alert may be available at www.mdaqmd.ca.gov/advisories. To view current and forecasted air quality levels, visit the antelope Valley Air Quality Management District website at www.avaqmd.ca.gov. To view current and forecasted air quality levels, visit the San Diego County Ai r Pollution Control District website at www.sdapcd.org/content/sdapcd/air-qualit y.html. Additional details for this air quality alert may be available at www.sd apcd.org/content/sdapcd/air-quality/smoke-advisory.html