Southland Overview

...RED FLAG WARNING IN EFFECT THROUGH THIS EVENING FOR ALL MOUNTAINS, ANTELOPE VALLEY AND ADJACENT FOOTHILLS, AS WELL AS SOUTHERN SANTA BARBARA COUNTY FOR EXTREMELY 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, 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. As a result, Red Flag Warnings will remain in place for all mountain and foothill areas through this evening, with the areas of highest concern being those with the stronger winds like southern Santa Barbara County. 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. Any storms that develop today will have the potential for dry lightning strikes and strong/erratic downburst winds, with localized gusts to 50 mph possible this afternoon. * 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 15 percent. Poor overnight recoveries of 15 to 30 percent. * TEMPERATURES...Maximums between 100 and 110 common for lower elevations, with minimums between 82 and 92. Isolated highs near 115 possible. * 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.More

...RED FLAG WARNING IN EFFECT THROUGH THIS EVENING FOR ALL MOUNTAINS, ANTELOPE VALLEY AND ADJACENT FOOTHILLS, AS WELL AS SOUTHERN SANTA BARBARA COUNTY FOR EXTREMELY 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, 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. As a result, Red Flag Warnings will remain in place for all mountain and foothill areas through this evening, with the areas of highest concern being those with the stronger winds like southern Santa Barbara County. 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. Any storms that develop today will have the potential for dry lightning strikes and strong/erratic downburst winds, with localized gusts to 50 mph possible this afternoon. * WINDS...West winds 15 to 20 mph with gusts up to 30 mph, except locally stronger and erratic winds. * 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, especially eastern portions this afternoon and evening, 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.More

* 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.More

* 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.More

* WHAT...Dangerously hot conditions with peak temperatures of 95 to 107 degrees. Warm overnight low temperatures will bring little relief from the heat. * 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.More

* WHAT...Daytime high temperatures will be in the uppers 80s and 90s. Isolated value around 100 degrees are likely, especially away from the coast. * 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.More

* WHAT...For the Excessive Heat Warning, dangerously hot conditions with temperatures up to 107. For the Wind Advisory, northwest winds 15 to 25 mph with gusts up to 45 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, from 4 PM this afternoon to 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.More

* WHAT...For the Excessive Heat Warning, dangerously hot conditions with temperatures up to 107. For the Wind Advisory, northwest winds 15 to 25 mph with gusts up to 45 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, from 4 PM this afternoon to 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.More

* WHAT...Dangerously hot conditions with daytime high temperatures up to 115 degrees. Overnight low temperatures will offer little reprieve from the heat. * 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.More

* 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.More

* WHAT...Hot weather will persist with daytime high temperatures in the upper 80s and 90s. Local daytime values may reach up to 100 degrees. Overnight low temperatures will remain warm and offer little reprieve from the heat. * 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.More

* WHAT...Dangerously conditions with daytime temperatures in the upper 80s and 90s. Local values up to 100 degrees are likely, especially away from the coast. Overnight low temperatures will offer little reprieve from the heat. * 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.More

The South Coast Air Quality Management District has issued an Air Quality Alert due to elevated ozone air pollution. This Air Quality Alert is in effect until 8 PM PDT Monday. 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 forecasted air quality levels, visit the South Coast Air Quality Management District website at aqmd.gov or download the mobile app at www.aqmd.gov/mobileapp. Additional details for this air quality alert may be available at www.aqmd.gov/advisory. For the additional information, call the South Coast Air Quality Management District.More

The South Coast Air Quality Management District has issued an Air Quality Alert due to elevated ozone air pollution. This Air Quality Alert is in effect until 8 PM PDT Monday and is for the Los Angeles County portion of the Santa Susana 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. 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 forecasted air quality levels, visit the South Coast Air Quality Management District website at aqmd.gov or download the mobile app at www.aqmd.gov/mobileapp. Additional details for this air quality alert may be available at www.aqmd.gov/advisory. For the additional information, call the South Coast Air Quality Management District.More