Logo
Alert Archives for All California Counties
If there's no Alerts for the day, there's no log file
Select a date:  
47 total alerts issued on this day

Updates Every 15 Minutes
Spacer GifLast Update:August 21, 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 20 11:06 pm Expired: Aug 21 3:00 pm Duration: 15 hrs   54 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 21 12:15 pm Expired: Aug 22 3:00 am Duration: 14 hrs   45 mins  
Riverside County   2 alerts
SVW.gif   EXTREME HEAT WARNING   (5 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 20 11:06 pm Expired: Aug 21 3:00 pm Duration: 15 hrs   54 mins  
  Areas affected: Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
Effective: Aug 20 7:39 pm Expired: Aug 21 6:15 am Duration: 10 hrs   36 mins  
  Areas affected: Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
Effective: Aug 21 1:42 am Expired: Aug 21 3:30 pm Duration: 13 hrs   48 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 21 12:15 pm Expired: Aug 22 3:00 am Duration: 14 hrs   45 mins  
  Areas affected: Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
Effective: Aug 21 12:23 pm Expired: Aug 21 10:00 pm Duration: 9 hrs   37 mins  
HTY.gif   HEAT ADVISORY  
  Areas affected: San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; Riverside County Mountains; Santa Ana Mountains and Foothills; San Diego County Mountains; Orange County Inland
Effective: Aug 21 12:23 pm Expired: Aug 21 10:00 pm Duration: 9 hrs   37 mins  
Inyo County
SVW.gif   EXTREME HEAT WARNING   (3 updates)
  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 20 4:57 am Expired: Aug 21 5:00 am Duration: 1 day   0 hrs   03 mins  
  Areas affected: Lake Havasu and Fort Mohave; Lake Mead - AZ side; Lake Mohave - AZ side; Northwest Deserts; Death Valley National Park; San Bernardino County-Upper Colorado River Valley; Las Vegas Valley; Lake Mead - NV side; Lake Mohave - NV side
Effective: Aug 21 3:55 am Expired: Aug 21 8:00 pm Duration: 16 hrs   05 mins  
  Areas affected: Lake Havasu and Fort Mohave; Lake Mead - AZ side; Lake Mohave - AZ side; Northwest Deserts; Death Valley National Park; San Bernardino County-Upper Colorado River Valley; Las Vegas Valley; Lake Mead - NV side; Lake Mohave - NV side
Effective: Aug 21 4:05 am Expired: Aug 21 8:00 pm Duration: 15 hrs   55 mins  
San Bernardino County   2 alerts
SVW.gif   EXTREME HEAT WARNING   (5 updates)
  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 20 4:57 am Expired: Aug 21 5:00 am Duration: 1 day   0 hrs   03 mins  
  Areas affected: Lake Havasu and Fort Mohave; Lake Mead - AZ side; Lake Mohave - AZ side; Northwest Deserts; Death Valley National Park; San Bernardino County-Upper Colorado River Valley; Las Vegas Valley; Lake Mead - NV side; Lake Mohave - NV side
Effective: Aug 21 3:55 am Expired: Aug 21 8:00 pm Duration: 16 hrs   05 mins  
  Areas affected: Hualapai Mountains; Eastern Mojave Desert, Including the Mojave National Preserve; Morongo Basin; Cadiz Basin; Northeast Clark County; Western Clark and Southern Nye County; Southern Clark County
Effective: Aug 21 3:55 am Expired: Aug 21 8:00 pm Duration: 16 hrs   05 mins  
  Areas affected: Lake Havasu and Fort Mohave; Lake Mead - AZ side; Lake Mohave - AZ side; Northwest Deserts; Death Valley National Park; San Bernardino County-Upper Colorado River Valley; Las Vegas Valley; Lake Mead - NV side; Lake Mohave - NV side
Effective: Aug 21 4:05 am Expired: Aug 21 8:00 pm Duration: 15 hrs   55 mins  
  Areas affected: Hualapai Mountains; Eastern Mojave Desert, Including the Mojave National Preserve; Morongo Basin; Cadiz Basin; Northeast Clark County; Western Clark and Southern Nye County; Southern Clark County
Effective: Aug 21 4:05 am Expired: Aug 21 8:00 pm Duration: 15 hrs   55 mins  
HTY.gif   HEAT ADVISORY   (2 updates)
  Areas affected: San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; Riverside County Mountains; Santa Ana Mountains and Foothills; San Diego County Mountains; Orange County Inland
Effective: Aug 21 12:23 pm Expired: Aug 21 10:00 pm Duration: 9 hrs   37 mins  
  Areas affected: San Bernardino County Mountains; Apple and Lucerne Valleys
Effective: Aug 21 12:23 pm Expired: Aug 21 10:00 pm Duration: 9 hrs   37 mins  
Lassen County   3 alerts
FWA.gif   FIRE WEATHER WATCH  
The National Weather Service in Reno has issued a Fire Weather
  Areas affected: Surprise Valley California; Eastern Lassen County; Northern Washoe County
Effective: Aug 20 10:52 am Expired: Aug 21 11:00 am Duration: 1 day   0 hrs   08 mins  
FWW.gif   RED FLAG WARNING   (2 updates)
The National Weather Service in Reno has issued a Red Flag
  Areas affected: Surprise Valley California; Eastern Lassen County; Northern Washoe County
Effective: Aug 21 7:37 am Expired: Aug 22 7:45 am Duration: 1 day   0 hrs   08 mins  
The National Weather Service in Reno has issued a Red Flag Warning
  Areas affected: Northern Sierra Front - Carson City/Douglas/Storey/Southern Washoe/Eastern Lyon/Far Southern Lassen Counties
Effective: Aug 21 7:37 am Expired: Aug 22 7:45 am Duration: 1 day   0 hrs   08 mins  
LWY.gif   LAKE WIND ADVISORY  
  Areas affected: Lassen-Eastern Plumas-Eastern Sierra Counties
Effective: Aug 21 11:22 am Expired: Aug 22 11:00 pm Duration: 1 day   11 hrs   38 mins  
Modoc County   2 alerts
FWA.gif   FIRE WEATHER WATCH   (3 updates)
The National Weather Service in Reno has issued a Fire Weather
  Areas affected: Surprise Valley California; Eastern Lassen County; Northern Washoe County
Effective: Aug 20 10:52 am Expired: Aug 21 11:00 am Duration: 1 day   0 hrs   08 mins  
The National Weather Service in Medford has issued a Red Flag
  Areas affected: Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 20 9:02 pm Expired: Aug 21 6:00 am Duration: 8 hrs   58 mins  
  Areas affected: Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 21 4:09 am Expired: Aug 21 8:00 pm Duration: 15 hrs   51 mins  
FWW.gif   RED FLAG WARNING   (5 updates)
The National Weather Service in Medford has issued a Red Flag
  Areas affected: Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 20 9:02 pm Expired: Aug 21 6:00 am Duration: 8 hrs   58 mins  
  Areas affected: Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 21 4:09 am Expired: Aug 21 8:00 pm Duration: 15 hrs   51 mins  
The National Weather Service in Reno has issued a Red Flag
  Areas affected: Surprise Valley California; Eastern Lassen County; Northern Washoe County
Effective: Aug 21 7:37 am Expired: Aug 22 7:45 am Duration: 1 day   0 hrs   08 mins  
RED FLAG WARNING IN EFFECT FROM 2 PM TO 9 PM PDT SATURDAY FOR STRONG GUSTY WIND AND LOW RH FOR FIRE WEATHER ZONES 284 AND 285
  Areas affected: Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 21 9:30 am Expired: Aug 21 9:30 pm Duration: 12 hrs   00 mins  
RED FLAG WARNING IN EFFECT FROM 2 PM TO 9 PM PDT SATURDAY FOR STRONG GUSTY WIND AND LOW RH FOR FIRE WEATHER ZONES 284 AND 285
  Areas affected: Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 21 9:30 am Expired: Aug 21 9:30 pm Duration: 12 hrs   00 mins  
Siskiyou County   2 alerts
FWW.gif   RED FLAG WARNING   (7 updates)
The National Weather Service in Medford has issued a Red Flag
  Areas affected: Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 20 9:02 pm Expired: Aug 21 6:00 am Duration: 8 hrs   58 mins  
A Red Flag Warning has also been issued from 2 PM to 9 PM PDT
  Areas affected: Central Siskiyou County Including Shasta Valley
Effective: Aug 20 9:02 pm Expired: Aug 21 6:00 am Duration: 8 hrs   58 mins  
  Areas affected: Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 21 4:09 am Expired: Aug 21 8:00 pm Duration: 15 hrs   51 mins  
A Red Flag Warning has also been issued from 2 PM to 9 PM PDT
  Areas affected: Central Siskiyou County Including Shasta Valley
Effective: Aug 21 4:09 am Expired: Aug 21 8:00 pm Duration: 15 hrs   51 mins  
RED FLAG WARNING IN EFFECT FROM 2 PM TO 9 PM PDT SATURDAY FOR STRONG GUSTY WIND AND LOW RH FOR FIRE WEATHER ZONES 284 AND 285
  Areas affected: Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 21 9:30 am Expired: Aug 21 9:30 pm Duration: 12 hrs   00 mins  
RED FLAG WARNING IN EFFECT FROM 2 PM TO 9 PM PDT SATURDAY FOR STRONG GUSTY WIND AND LOW RH FOR FIRE WEATHER ZONES 284 AND 285
  Areas affected: Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 21 9:30 am Expired: Aug 21 9:30 pm Duration: 12 hrs   00 mins  
  Areas affected: Central Siskiyou County Including Shasta Valley
Effective: Aug 21 9:30 am Expired: Aug 21 9:00 pm Duration: 11 hrs   30 mins  
FWA.gif   FIRE WEATHER WATCH   (2 updates)
The National Weather Service in Medford has issued a Red Flag
  Areas affected: Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 20 9:02 pm Expired: Aug 21 6:00 am Duration: 8 hrs   58 mins  
  Areas affected: Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 21 4:09 am Expired: Aug 21 8:00 pm Duration: 15 hrs   51 mins  
San Diego County   2 alerts
SVW.gif   EXTREME HEAT WARNING   (3 updates)
  Areas affected: Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
Effective: Aug 20 7:39 pm Expired: Aug 21 6:15 am Duration: 10 hrs   36 mins  
  Areas affected: Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
Effective: Aug 21 1:42 am Expired: Aug 21 3:30 pm Duration: 13 hrs   48 mins  
  Areas affected: Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
Effective: Aug 21 12:23 pm Expired: Aug 21 10:00 pm Duration: 9 hrs   37 mins  
HTY.gif   HEAT ADVISORY  
  Areas affected: San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; Riverside County Mountains; Santa Ana Mountains and Foothills; San Diego County Mountains; Orange County Inland
Effective: Aug 21 12:23 pm Expired: Aug 21 10:00 pm Duration: 9 hrs   37 mins  
Sierra County   2 alerts
FWW.gif   RED FLAG WARNING  
The National Weather Service in Reno has issued a Red Flag Warning
  Areas affected: Northern Sierra Front - Carson City/Douglas/Storey/Southern Washoe/Eastern Lyon/Far Southern Lassen Counties
Effective: Aug 21 7:37 am Expired: Aug 22 7:45 am Duration: 1 day   0 hrs   08 mins  
LWY.gif   LAKE WIND ADVISORY  
  Areas affected: Lassen-Eastern Plumas-Eastern Sierra Counties
Effective: Aug 21 11:22 am Expired: Aug 22 11:00 pm Duration: 1 day   11 hrs   38 mins  
Plumas County
LWY.gif   LAKE WIND ADVISORY  
  Areas affected: Lassen-Eastern Plumas-Eastern Sierra Counties
Effective: Aug 21 11:22 am Expired: Aug 22 11:00 pm Duration: 1 day   11 hrs   38 mins  
Orange County
HTY.gif   HEAT ADVISORY  
  Areas affected: San Bernardino and Riverside County Valleys-The Inland Empire; San Diego County Inland Valleys; Riverside County Mountains; Santa Ana Mountains and Foothills; San Diego County Mountains; Orange County Inland
Effective: Aug 21 12:23 pm Expired: Aug 21 10:00 pm Duration: 9 hrs   37 mins  


Contact Us Contact Us Thumbnail | Home Mobile Phone Thumbnail | Private Policy
Terms & Conds | Consent Preferences | Cookie Policy
Never base life decisions on weather info over Internet.
Site dedicated to Jesus Christ | Random Quotes
Copyright © 2026 El Dorado Weather, Inc.