San Diego, CA Warnings, Watches and Advisories

Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather 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 Diego.

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

Flash Flood Warning issued September 18 at 6:37PM PDT until September 19 at 12:30AM PDT by NWS Sacramento CA

FFWSTO The National Weather Service in Sacramento has issued a * Flash Flood Warning for... The Park burn scar in... Northwestern Butte County in northern California... Eastern Tehama County in northern California... * Until 1230 AM PDT. * At 637 PM PDT, Doppler radar indicated thunderstorms producing heavy rain over the northern portion of the Park Burn Scar. Flash flooding is ongoing or expected to begin shortly. Excessive rainfall over the burn scar will result in debris flow moving through the mill creek drainage basin within the park fire burn scar. The debris flow can consist of rock, mud, vegetation and other loose materials. HAZARD...Life threatening flash flooding. Thunderstorms producing flash flooding in and around the Park Burn Scar. SOURCE...Radar. IMPACT...Life threatening flash flooding of areas in and around the Park Burn Scar. * Some locations that will experience flash flooding include... Paynes Creek, Forest Ranch and Richardson Springs. * Additional locations include... Mud Creek, Rock Creek, Pine Creek, Deer Creek, Mill Creek, Antelope Creek, and Paynes Creek Rainfall amounts of 0.50 to 1.00 inches has occurred over the northern portion of the burn scar in the mill creek drainage basin. The flash flood threat is currently over eastern Tehama county including Mill, Antelope and Deer creeks.

Winter Weather Advisory issued September 18 at 6:33PM PDT until September 19 at 8:00PM PDT by NWS Hanford CA

* WHAT...Snow expected. Total snow accumulations of 2 to 5 inches. * WHERE...Elevations above 9,000 feet. Includes Yosemite NP outside of the valley, Upper San Joaquin River, Kings Canyon NP, and Sequoia NP. * WHEN...From 2 PM Wednesday to 8 PM PDT Thursday. * IMPACTS...Travel could be very difficult due to snow covered roads. * ADDITIONAL DETAILS...Stronger showers and thunderstorms could briefly lower snow levels to around 8,000 to 8,500 feet at times.

Flood Watch issued September 18 at 5:46PM PDT until September 19 at 11:00PM PDT by NWS Hanford CA

* WHAT...Flooding caused by excessive rainfall due to thunderstorms is possible. * WHERE...A portion of central California, including the following areas, Buena Vista, Frazier Mountain Communities and West Side Mountains South of 198. * WHEN...From 5 AM PDT Thursday through Thursday evening. * IMPACTS...Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Area creeks and streams are running high and could flood with more heavy rain. The thunderstorms will have the potential to impact the Hurricane burn scar during the period of the watch. Residents near the Hurricane Burn Scar should prepare for the possibility of flooding impacts. * ADDITIONAL DETAILS... - Residents near the Hurricane Burn Scar should prepare for the possibility of flooding impacts. - http://www.weather.gov/safety/flood

Air Quality Alert issued September 18 at 4:39PM PDT by NWS San Diego CA

The South Coast AQMD has issued an air quality alert due to increased fine particle pollution from wildfire smoke in the region. The air quality alert is in effect until 2 PM Thursday. 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. 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 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. To view current and forecasted air quality levels, visit the antelope Valley Air Quality Management District website at www.avaqmd.ca.gov.

Air Quality Alert issued September 18 at 4:31PM PDT by NWS Los Angeles/Oxnard CA

The South Coast AQMD has issued an air quality alert due to increased fine particle pollution from wildfire smoke in the region. The air quality alert is in effect until 2 PM Thursday. 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. 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 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. To view current and forecasted air quality levels, visit the antelope Valley Air Quality Management District website at www.avaqmd.ca.gov.

Winter Weather Advisory issued September 18 at 2:05PM PDT until September 19 at 8:00PM PDT by NWS Reno NV

* WHAT...Snow accumulations up to an inch possible above 8500 feet, and 1 to 4 inches above 9000 feet. Locally greater amounts possible on the highest peaks of the Sierra and White Mountains. * WHERE...Mono County. * WHEN...Until 8 PM PDT Thursday. The best chance for accumulating snow will be late tonight into Thursday morning. * IMPACTS...Plan on slick conditions for higher elevation roads, especially over Sonora and Tioga Passes and CA Highway 203 west of Mammoth Lakes. Expect rapidly changing weather conditions in the backcountry.

Flood Watch issued September 18 at 10:01AM PDT until September 19 at 11:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Flash flooding and debris flows caused by excessive rainfall are possible, especially over the Hurricane and Apache burn scars. * WHERE...A portion of southwest California, including the following areas, Cuyama Valley, Northern Ventura County Mountains, San Luis Obispo County Interior Valleys, and San Luis Obispo County Mountains. * WHEN...From Thursday morning through Thursday evening. * IMPACTS...National Weather Service Meteorologists are forecasting thunderstorms capable of producing heavy rainfall across the Watch area on Thursday. Rainfall rates of one-half inch per 30 minutes and one inch per hour will be possible, capable of producing flash flooding. The most-likely time period for this activity will be 1 PM PDT through 7 PM PDT Thursday. Excessive runoff may result in flooding of rivers, creeks, streams, and other low-lying and flood-prone locations. Low-water crossings may be flooded. Storm drains and ditches may become clogged with debris. Extensive street flooding and flooding of creeks is possible. The thunderstorms will have the potential to impact the Hurricane and Apache burn scars during the period of the Watch. Residents near the Hurricane and Apache burn scars should prepare for the possibility of debris flows and flooding impacts. * ADDITIONAL DETAILS... - The Lake burn scar is southwest of the most-likely area of Thursday thunderstorms. However, there is some potential for this activity to drift over the Lake burn scar Thursday afternoon and evening. If this were to occur -- 20 percent chance -- flash flooding and debris flows could also impact the Lake burn scar. This area will be monitored closely for possible expansions to flood headlines. - http://www.weather.gov/safety/flood

Air Quality Alert issued September 17 at 1:22PM PDT by NWS San Diego CA

The South Coast AQMD has updated an air quality alert due to increased fine particle pollution from wildfire smoke in the region. The air quality alert is in effect Tuesday and Wednesday. 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. 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 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. 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 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