California County Alert Archives from the National Weather Service

Alert Archives for All California Counties

If there's no Alerts for the day, there's no log file

Select a date: 20 total alerts issued on this day Updates Every 15 Minutes
Alert Summary \| Alert RSS Feed \| Alert Archives \| Icon key Last Update:August 22, 2026 - 7:00 am PDT

Plumas County

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

Lassen County 2 alerts

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

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

Sierra County 2 alerts

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

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

Imperial County

EXTREME HEAT WARNING
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

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 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 9:35 pm	Expired: Aug 22 6:30 am	Duration: 8 hrs 55 mins

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 9:35 pm	Expired: Aug 22 6:30 am	Duration: 8 hrs 55 mins

Inyo County

EXTREME HEAT WARNING
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 7:31 pm	Expired: Aug 22 4:00 pm	Duration: 20 hrs 29 mins

San Bernardino County 2 alerts

EXTREME HEAT WARNING
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 7:31 pm	Expired: Aug 22 4:00 pm	Duration: 20 hrs 29 mins

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 9:35 pm	Expired: Aug 22 6:30 am	Duration: 8 hrs 55 mins
Areas affected: San Bernardino County Mountains
Effective: Aug 21 9:35 pm	Expired: Aug 22 6:30 am	Duration: 8 hrs 55 mins

Modoc County

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
Areas affected: Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 21 8:34 pm	Expired: Aug 22 5:00 am	Duration: 8 hrs 26 mins

Siskiyou County

RED FLAG WARNING
Areas affected: Siskiyou County from the Cascade Mountains East and South to Mt Shasta; Modoc County Except for the Surprise Valley
Effective: Aug 21 8:34 pm	Expired: Aug 22 5:00 am	Duration: 8 hrs 26 mins

Orange County

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 9:35 pm	Expired: Aug 22 6:30 am	Duration: 8 hrs 55 mins

San Diego County 2 alerts

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 9:35 pm	Expired: Aug 22 6:30 am	Duration: 8 hrs 55 mins

EXTREME HEAT WARNING
Areas affected: Coachella Valley; San Diego County Deserts; San Gorgonio Pass Near Banning
Effective: Aug 21 9:35 pm	Expired: Aug 22 6:30 am	Duration: 8 hrs 55 mins

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