Humboldt County, CA Warnings, Watches and Advisories

Do not drive vehicles through flooded areas. The water depth and road condition may be 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 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 Humboldt County.

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

Red Flag Warning issued September 9 at 3:00PM PDT until September 9 at 11:00PM PDT by NWS Los Angeles/Oxnard CA

...RED FLAG WARNING IN EFFECT UNTIL 11 PM MONDAY EVENING FOR THE WESTERN SANTA YNEZ RANGE AND SOUTHWEST SANTA BARBARA COUNTY COAST... ...RED FLAG WARNING IN EFFECT UNTIL NOON PDT WEDNESDAY DUE TO HOT, DRY, AND UNSTABLE CONDITIONS TODAY TRANSITIONING TO GUSTY ONSHORE WINDS AND LOW HUMIDITIES TUESDAY INTO EARLY WEDNESDAY OVER THE SAN GABRIEL MOUNTAINS AND HIGHWAY 14 CORRIDOR... ...RED FLAG WARNING IN EFFECT FROM NOON TUESDAY TO NOON PDT WEDNESDAY FOR GUSTY ONSHORE WINDS AND LOW RELATIVE HUMIDITY FOR THE INTERSTATE 5 CORRIDOR AND ANTELOPE VALLEY FOOTHILLS... .The long duration heat wave continues today away from the immediate coast. Another round of gusty sundowner winds are expected for the western Santa Ynez range and southwest Santa Barbara coast through this evening, with gusts of 25 to 45 mph common, strongest from Gaviota to San Marcos Pass. These sundowner winds will bring temperatures of 90 to 100 degrees along with humidities lowering to around 15 percent. The heat combined with lingering instability has brought deep mixing heights up to 16,000 feet today, leading to an elevated risk for erratic plume-dominated fire behavior. The greatest concern today continues over the San Gabriel mountains, where there is the best instability, and the active Bridge Fire which will continue to exhibit erratic plume dominated fire behavior today. As the onshore winds increase, and humidities lower, Red Flag fire weather conditions will likely continue in the San Gabriel mountains Tuesday into early Wednesday, and expand into the Interstate 5 corridor and Antelope Valley foothills during that time. * WINDS...Northwest to north 15 to 30 mph with gusts up to 40 mph, strongest in the evening. Isolated gusts to 45 mph near Gaviota/Refugio this evening. Gusty and erratic winds possible with any new fires. * RELATIVE HUMIDITY...Minimums 10 to 20 percent, driest in the foothills. Poor minimal overnight recoveries of 15 to 25 percent in the foothills and mountains. * TEMPERATURES...Maximums between 92 and 102 common in the foothills and mountains, with minimums between 72 and 82. * 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 9 at 3:00PM PDT until September 11 at 12:00PM PDT by NWS Los Angeles/Oxnard CA

...RED FLAG WARNING IN EFFECT UNTIL 11 PM MONDAY EVENING FOR THE WESTERN SANTA YNEZ RANGE AND SOUTHWEST SANTA BARBARA COUNTY COAST... ...RED FLAG WARNING IN EFFECT UNTIL NOON PDT WEDNESDAY DUE TO HOT, DRY, AND UNSTABLE CONDITIONS TODAY TRANSITIONING TO GUSTY ONSHORE WINDS AND LOW HUMIDITIES TUESDAY INTO EARLY WEDNESDAY OVER THE SAN GABRIEL MOUNTAINS AND HIGHWAY 14 CORRIDOR... ...RED FLAG WARNING IN EFFECT FROM NOON TUESDAY TO NOON PDT WEDNESDAY FOR GUSTY ONSHORE WINDS AND LOW RELATIVE HUMIDITY FOR THE INTERSTATE 5 CORRIDOR AND ANTELOPE VALLEY FOOTHILLS... .The long duration heat wave continues today away from the immediate coast. Another round of gusty sundowner winds are expected for the western Santa Ynez range and southwest Santa Barbara coast through this evening, with gusts of 25 to 45 mph common, strongest from Gaviota to San Marcos Pass. These sundowner winds will bring temperatures of 90 to 100 degrees along with humidities lowering to around 15 percent. The heat combined with lingering instability has brought deep mixing heights up to 16,000 feet today, leading to an elevated risk for erratic plume-dominated fire behavior. The greatest concern today continues over the San Gabriel mountains, where there is the best instability, and the active Bridge Fire which will continue to exhibit erratic plume dominated fire behavior today. As the onshore winds increase, and humidities lower, Red Flag fire weather conditions will likely continue in the San Gabriel mountains Tuesday into early Wednesday, and expand into the Interstate 5 corridor and Antelope Valley foothills during that time. * WINDS...Southwest winds 10 to 20 mph with gusts to 25 mph this afternoon and evening, shirting to the northwest 8 to 15 mph overnight. Southwest winds 10 to 20 mph with gusts to 25 mph redeveloping Tuesday morning, increasing to 15 to 25 mph with gusts to 35 mph by Tuesday afternoon and night. Isolated gusts to 40 mph across favored ridgetops. * RELATIVE HUMIDITY...Daytime minimums 8 to 18 percent today, Tuesday, and early Wednesday, falling as low as 5 to 10 percent Tuesday night. Humidities expected to moderate some by Wednesday afternoon. * TEMPERATURES...Maximums between 95 and 103 common in the foothills and mountains today, lowering to 88 to 98 on Tuesday. Minimum temperatures tonight between 75 and 85. * 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 9 at 3:00PM PDT until September 11 at 12:00PM PDT by NWS Los Angeles/Oxnard CA

...RED FLAG WARNING IN EFFECT UNTIL 11 PM MONDAY EVENING FOR THE WESTERN SANTA YNEZ RANGE AND SOUTHWEST SANTA BARBARA COUNTY COAST... ...RED FLAG WARNING IN EFFECT UNTIL NOON PDT WEDNESDAY DUE TO HOT, DRY, AND UNSTABLE CONDITIONS TODAY TRANSITIONING TO GUSTY ONSHORE WINDS AND LOW HUMIDITIES TUESDAY INTO EARLY WEDNESDAY OVER THE SAN GABRIEL MOUNTAINS AND HIGHWAY 14 CORRIDOR... ...RED FLAG WARNING IN EFFECT FROM NOON TUESDAY TO NOON PDT WEDNESDAY FOR GUSTY ONSHORE WINDS AND LOW RELATIVE HUMIDITY FOR THE INTERSTATE 5 CORRIDOR AND ANTELOPE VALLEY FOOTHILLS... .The long duration heat wave continues today away from the immediate coast. Another round of gusty sundowner winds are expected for the western Santa Ynez range and southwest Santa Barbara coast through this evening, with gusts of 25 to 45 mph common, strongest from Gaviota to San Marcos Pass. These sundowner winds will bring temperatures of 90 to 100 degrees along with humidities lowering to around 15 percent. The heat combined with lingering instability has brought deep mixing heights up to 16,000 feet today, leading to an elevated risk for erratic plume-dominated fire behavior. The greatest concern today continues over the San Gabriel mountains, where there is the best instability, and the active Bridge Fire which will continue to exhibit erratic plume dominated fire behavior today. As the onshore winds increase, and humidities lower, Red Flag fire weather conditions will likely continue in the San Gabriel mountains Tuesday into early Wednesday, and expand into the Interstate 5 corridor and Antelope Valley foothills during that time. The National Weather Service in Los Angeles/Oxnard has issued a Red Flag Warning for gusty onshore winds and low relative humidity, which is in effect from noon Tuesday to noon PDT Wednesday. * WINDS...South to southwest winds increasing to 15 to 25 mph with gusts to 35 mph Tuesday afternoon and evening, except 20 to 30 mph with gusts to 45 mph in the Antelope Valley foothills. Winds becoming west to northwest by Wednesday. * RELATIVE HUMIDITY...Daytime minimums 8 to 18 percent Tuesday and early Wednesday, falling as low as 5 to 10 percent Tuesday night. Humidities expected to moderate some by Wednesday afternoon. * TEMPERATURES...Maximums 88 to 98 on Tuesday, with cooling on Wednesday. * 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 9 at 1:31PM PDT until September 9 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Dangerously hot conditions with high temperatures between 98 and 108 common, and very warm overnight conditions. * WHERE...For many interior mountains of southwest California, as well as the Santa Ynez Range, the northern Ventura Valleys, and the Los Angeles County Beaches. * 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. * ADDITIONAL DETAILS...Some foothill areas will remain very warm tonight, but after several days of dangerous heat, significant cooling remains on track for Tuesday through Thursday.

Heat Advisory issued September 9 at 1:31PM PDT until September 9 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Hot conditions with high temperatures between 90 and 100 common. * WHERE...The southern Santa Barbara County coasts and the Ventura County Inland 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. * ADDITIONAL DETAILS...After several days of dangerous heat, significant cooling remains on track for Tuesday through Thursday.

Excessive Heat Warning issued September 9 at 1:31PM PDT until September 10 at 8:00PM PDT by NWS Los Angeles/Oxnard CA

* WHAT...Dangerously hot conditions, with high temperatures between 100 and 110 common on Monday and 93 to 103 common on Tuesday. Temperatures tonight will remain very warm. * WHERE...The Los Angeles County coastal valleys and inland coasts (including Downtown Los Angeles), the eastern Ventura Valleys, the Palos Verdes Hills, the Santa Monica Mountains, and the Santa Susana Mountains. * WHEN...Until 8 PM PDT Tuesday. * 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. * ADDITIONAL DETAILS...While daytime temperatures will lower on Tuesday, they will not lower as much as previously expected. Temperatures tonight will also remain very warm. As such, the warning was extended through Tuesday for these specific locations. High confidennce that this will be the last extension and that all Heat Warnings or Advisories will end Tuesday evening.

Heat Advisory issued September 9 at 1:05PM PDT until September 9 at 8:00PM PDT by NWS San Diego CA

* WHAT...High temperatures in the upper 80s near the coast to the 90s a few miles inland. * WHERE...Orange County Coastal Areas. * WHEN...Until 8 PM PDT this evening. * IMPACTS...Hot temperatures may cause heat illnesses.

Heat Advisory issued September 9 at 1:05PM PDT until September 9 at 8:00PM PDT by NWS San Diego CA

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

Excessive Heat Warning issued September 9 at 1:05PM PDT until September 10 at 8:00PM PDT by NWS San Diego CA

* WHAT...Hot conditions with high temperatures 100 to 105 degrees on Tuesday. Low temperatures Tuesday morning will remain in the mid-70s. * WHERE...San Bernardino and Riverside County Valleys-The Inland Empire. * WHEN...Until 8 PM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...High temperatures on Tuesday are expected to be 5 to 10 degrees cooler than Monday, but elevated low temperatures Tuesday morning will prevent overnight recovery from the heat. Moderate to locally major HeatRisk is expected Tuesday. Further cooling of both the high and low temperatures is expected for Wednesday.

Excessive Heat Warning issued September 9 at 1:05PM PDT until September 10 at 8:00PM PDT by NWS San Diego CA

* WHAT...Hot conditions with high temperatures 95 to 100 degrees expected. Low temperatures will be in the low to mid-70s. * WHERE...Santa Ana Mountains and Foothills. * WHEN...Until 8 PM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...High temperatures on Tuesday are expected to be 5 degrees cooler than Monday, but elevated low temperatures Tuesday morning will prevent overnight recovery from the heat. Moderate to locally major HeatRisk is expected Tuesday. Further cooling of both the high and low temperatures is expected for Wednesday.

Excessive Heat Warning issued September 9 at 1:05PM PDT until September 10 at 8:00PM PDT by NWS San Diego CA

* WHAT...Hot conditions with high temperatures in the upper 90s. Low temperatures will be in the low 70s. * WHERE...Orange County Inland Areas. * WHEN...Until 8 PM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...High temperatures on Tuesday are expected to be 5 to 10 degrees cooler than Monday, but elevated low temperatures Tuesday morning will prevent overnight recovery from the heat. Moderate to locally major HeatRisk is expected Tuesday. Further cooling of both the high and low temperatures is expected for Wednesday.

Excessive Heat Warning issued September 9 at 1:05PM PDT until September 10 at 8:00PM PDT by NWS San Diego CA

* WHAT...Hot conditions with high temperatures of 97 to 102 degrees. Low temperatures will be in the upper 60s to mid-70s. Warmest low temperatures will be in the eastern portions of the valleys. * WHERE...San Diego County Valleys. * WHEN...Until 8 PM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events. * ADDITIONAL DETAILS...High temperatures on Tuesday are expected to be 5 to 10 degrees cooler than Monday, but elevated low temperatures Tuesday morning will prevent overnight recovery from the heat. Moderate to locally major HeatRisk is expected Tuesday. Further cooling of both the high and low temperatures is expected for Wednesday.

Excessive Heat Warning issued September 9 at 12:12PM MST until September 10 at 8:00PM MST by NWS Phoenix AZ

* WHAT...Dangerously hot conditions. Afternoon temperatures 108 to 115. 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, Imperial Valley, and Chuckwalla Valley. * WHEN...Until 8 PM PDT Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Excessive Heat Warning issued September 9 at 12:12PM MST until September 10 at 8:00PM MST by NWS Phoenix AZ

* WHAT...Dangerously hot conditions. Afternoon temperatures 109 to 113. Major Heat Risk. Overexposure can cause heat cramps and heat exhaustion to develop and, without intervention, can lead to heat stroke. * WHERE...In Arizona, Parker Valley and Yuma. In California, Palo Verde Valley. * WHEN...Until 8 PM MST /8 PM PDT/ Tuesday. * IMPACTS...Heat related illnesses increase significantly during extreme heat events.

Air Quality Alert issued September 9 at 9:44AM MST by NWS Phoenix AZ

The Imperial County APCD has issued an air quality alert for the Imperial Valley due to high levels of ozone (smog). The air quality alert is in effect Tuesday, September 10, 2024 from 7 AM until 8 PM. 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. 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 September 8 at 10:14PM PDT by NWS San Diego CA

The South Coast AQMD has extended an air quality alert due to increased fine particle pollution from wildfire smoke in the region and due to high levels of ozone (smog). The air quality alert is in effect until 11 PM on Monday for wildfire smoke and until 8 PM on Monday for ozone. 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. 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. To view current and forecasted air quality levels in the South Coast Air Basin, 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 in the Mojave Desert, 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.

Air Quality Alert issued September 8 at 9:07PM PDT by NWS San Diego CA

The South Coast AQMD has extended an air quality alert due to increased fine particle pollution from wildfire smoke in the region and due to high levels of ozone (smog). The air quality alert is in effect until 11 PM on Monday for wildfire smoke and until 8 PM on Monday for ozone. 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. 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. To view current and forecasted air quality levels in the South Coast Air Basin, 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 in the Mojave Desert, 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.

Air Quality Alert issued September 8 at 8:34PM 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. 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

Air Quality Alert issued September 7 at 8:40PM PDT by NWS San Diego 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 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. 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

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