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Alert Archives for All California Counties
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24 total alerts issued on this day

Updates Every 15 Minutes
Spacer GifLast Update:August 20, 2026 - 7:00 am PDT
Imperial County
SVW.gif   EXTREME HEAT WARNING   (2 updates)
  Areas affected: Parker Valley; Kofa; Yuma; Central La Paz; Southeast Yuma County; Gila River Valley; Imperial County Southwest; Imperial County Southeast; Imperial County West; Imperial Valley; Palo Verde Valley; Chuckwalla Valley
Effective: Aug 19 10:49 am Expired: Aug 20 5:00 am Duration: 18 hrs   11 mins  
  Areas affected: Parker Valley; Kofa; Yuma; Central La Paz; Southeast Yuma County; Gila River Valley; Imperial County Southwest; Imperial County Southeast; Imperial County West; Imperial Valley; Palo Verde Valley; Chuckwalla Valley
Effective: Aug 20 2:30 am Expired: Aug 20 3:30 pm Duration: 13 hrs   00 mins  
Riverside County   2 alerts
SVW.gif   EXTREME HEAT WARNING   (4 updates)
  Areas affected: Parker Valley; Kofa; Yuma; Central La Paz; Southeast Yuma County; Gila River Valley; Imperial County Southwest; Imperial County Southeast; Imperial County West; Imperial Valley; Palo Verde Valley; Chuckwalla Valley
Effective: Aug 19 10:49 am Expired: Aug 20 5:00 am Duration: 18 hrs   11 mins  
  Areas affected: Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
Effective: Aug 19 8:39 pm Expired: Aug 20 6:15 am Duration: 9 hrs   36 mins  
  Areas affected: Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
Effective: Aug 20 1:31 am Expired: Aug 20 3:30 pm Duration: 13 hrs   59 mins  
  Areas affected: Parker Valley; Kofa; Yuma; Central La Paz; Southeast Yuma County; Gila River Valley; Imperial County Southwest; Imperial County Southeast; Imperial County West; Imperial Valley; Palo Verde Valley; Chuckwalla Valley
Effective: Aug 20 2:30 am Expired: Aug 20 3:30 pm Duration: 13 hrs   00 mins  
HTY.gif   HEAT ADVISORY   (2 updates)
  Areas affected: San Bernardino and Riverside County Valleys-The Inland Empire
Effective: Aug 19 8:39 pm Expired: Aug 20 6:15 am Duration: 9 hrs   36 mins  
  Areas affected: San Bernardino and Riverside County Valleys-The Inland Empire
Effective: Aug 20 1:31 am Expired: Aug 20 3:30 pm Duration: 13 hrs   59 mins  
Inyo County
SVW.gif   EXTREME HEAT WARNING  
  Areas affected: Lake Havasu and Fort Mohave; Lake Mead - AZ side; Lake Mohave - AZ side; Hualapai Mountains; Northwest Deserts; Death Valley National Park; Eastern Mojave Desert, Including the Mojave National Preserve; Morongo Basin; Cadiz Basin; San Bernardino County-Upper Colorado River Valley; Northeast Clark County; Western Clark and Southern Nye County; Las Vegas Valley; Southern Clark County; Lake Mead - NV side; Lake Mohave - NV side
Effective: Aug 19 4:11 am Expired: Aug 20 5:00 am Duration: 1 day   0 hrs   49 mins  
San Bernardino County   2 alerts
SVW.gif   EXTREME HEAT WARNING  
  Areas affected: Lake Havasu and Fort Mohave; Lake Mead - AZ side; Lake Mohave - AZ side; Hualapai Mountains; Northwest Deserts; Death Valley National Park; Eastern Mojave Desert, Including the Mojave National Preserve; Morongo Basin; Cadiz Basin; San Bernardino County-Upper Colorado River Valley; Northeast Clark County; Western Clark and Southern Nye County; Las Vegas Valley; Southern Clark County; Lake Mead - NV side; Lake Mohave - NV side
Effective: Aug 19 4:11 am Expired: Aug 20 5:00 am Duration: 1 day   0 hrs   49 mins  
HTY.gif   HEAT ADVISORY   (2 updates)
  Areas affected: San Bernardino and Riverside County Valleys-The Inland Empire
Effective: Aug 19 8:39 pm Expired: Aug 20 6:15 am Duration: 9 hrs   36 mins  
  Areas affected: San Bernardino and Riverside County Valleys-The Inland Empire
Effective: Aug 20 1:31 am Expired: Aug 20 3:30 pm Duration: 13 hrs   59 mins  
Modoc County
FWA.gif   FIRE WEATHER WATCH   (2 updates)
The National Weather Service in Medford has issued a Fire Weather
  Areas affected: Central Siskiyou County Including Shasta Valley; Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 19 11:53 am Expired: Aug 20 12:00 am Duration: 12 hrs   07 mins  
  Areas affected: Central Siskiyou County Including Shasta Valley; Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 20 1:40 am Expired: Aug 20 5:00 pm Duration: 15 hrs   20 mins  
Siskiyou County
FWA.gif   FIRE WEATHER WATCH   (2 updates)
The National Weather Service in Medford has issued a Fire Weather
  Areas affected: Central Siskiyou County Including Shasta Valley; Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 19 11:53 am Expired: Aug 20 12:00 am Duration: 12 hrs   07 mins  
  Areas affected: Central Siskiyou County Including Shasta Valley; Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 20 1:40 am Expired: Aug 20 5:00 pm Duration: 15 hrs   20 mins  
San Diego County
SVW.gif   EXTREME HEAT WARNING   (2 updates)
  Areas affected: Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
Effective: Aug 19 8:39 pm Expired: Aug 20 6:15 am Duration: 9 hrs   36 mins  
  Areas affected: Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
Effective: Aug 20 1:31 am Expired: Aug 20 3:30 pm Duration: 13 hrs   59 mins  
San Luis Obispo County
HTY.gif   HEAT ADVISORY   (2 updates)
  Areas affected: Cuyama Valley; Santa Clarita Valley; Southern Salinas Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; Santa Ynez Mountains Western Range; Santa Barbara County Interior Mountains; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Santa Susana Mountains; Southern Ventura County Mountains; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Los Angeles County San Gabriel Valley
Effective: Aug 19 2:48 am Expired: Aug 20 4:00 pm Duration: 1 day   13 hrs   12 mins  
  Areas affected: Cuyama Valley; Santa Clarita Valley; Southern Salinas Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; Santa Ynez Mountains Western Range; Santa Barbara County Interior Mountains; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Santa Susana Mountains; Southern Ventura County Mountains; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Los Angeles County San Gabriel Valley
Effective: Aug 20 1:31 am Expired: Aug 20 8:00 pm Duration: 18 hrs   29 mins  
Santa Barbara County
HTY.gif   HEAT ADVISORY   (2 updates)
  Areas affected: Cuyama Valley; Santa Clarita Valley; Southern Salinas Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; Santa Ynez Mountains Western Range; Santa Barbara County Interior Mountains; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Santa Susana Mountains; Southern Ventura County Mountains; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Los Angeles County San Gabriel Valley
Effective: Aug 19 2:48 am Expired: Aug 20 4:00 pm Duration: 1 day   13 hrs   12 mins  
  Areas affected: Cuyama Valley; Santa Clarita Valley; Southern Salinas Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; Santa Ynez Mountains Western Range; Santa Barbara County Interior Mountains; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Santa Susana Mountains; Southern Ventura County Mountains; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Los Angeles County San Gabriel Valley
Effective: Aug 20 1:31 am Expired: Aug 20 8:00 pm Duration: 18 hrs   29 mins  
Ventura County
HTY.gif   HEAT ADVISORY   (2 updates)
  Areas affected: Cuyama Valley; Santa Clarita Valley; Southern Salinas Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; Santa Ynez Mountains Western Range; Santa Barbara County Interior Mountains; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Santa Susana Mountains; Southern Ventura County Mountains; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Los Angeles County San Gabriel Valley
Effective: Aug 19 2:48 am Expired: Aug 20 4:00 pm Duration: 1 day   13 hrs   12 mins  
  Areas affected: Cuyama Valley; Santa Clarita Valley; Southern Salinas Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; Santa Ynez Mountains Western Range; Santa Barbara County Interior Mountains; Calabasas and Agoura Hills; Western San Fernando Valley; Eastern San Fernando Valley; Santa Susana Mountains; Southern Ventura County Mountains; Western San Gabriel Mountains and Highway 14 Corridor; Eastern San Gabriel Mountains; Los Angeles County San Gabriel Valley
Effective: Aug 20 1:31 am Expired: Aug 20 8:00 pm Duration: 18 hrs   29 mins  


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