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: 36 total alerts issued on this day Updates Every 15 Minutes
Alert Summary \| Alert RSS Feed \| Alert Archives \| Icon key Last Update:August 18, 2026 - 7:00 am PDT

Imperial County 2 alerts

EXTREME HEAT WARNING (3 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 17 11:47 am	Expired: Aug 18 3:00 am	Duration: 15 hrs 13 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 18 12:28 am	Expired: Aug 18 3:30 pm	Duration: 15 hrs 02 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 18 11:47 am	Expired: Aug 19 3:00 am	Duration: 15 hrs 13 mins

AIR QUALITY ALERT
Areas affected: Imperial Valley
Effective: Aug 18 10:48 am	Expired: Aug 18 8:00 pm	Duration: 9 hrs 12 mins

Riverside County 2 alerts

EXTREME HEAT WARNING (3 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 17 11:47 am	Expired: Aug 18 3:00 am	Duration: 15 hrs 13 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 18 12:28 am	Expired: Aug 18 3:30 pm	Duration: 15 hrs 02 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 18 11:47 am	Expired: Aug 19 3:00 am	Duration: 15 hrs 13 mins

HEAT ADVISORY (2 updates)
Areas affected: San Bernardino and Riverside County Valleys-The Inland Empire
Effective: Aug 18 11:56 am	Expired: Aug 18 10:00 pm	Duration: 10 hrs 04 mins
Areas affected: San Bernardino and Riverside County Valleys-The Inland Empire
Effective: Aug 18 8:47 pm	Expired: Aug 19 6:15 am	Duration: 9 hrs 28 mins

Inyo County

EXTREME HEAT WARNING (2 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 17 1:32 pm	Expired: Aug 18 5:00 am	Duration: 15 hrs 28 mins
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 18 4:16 am	Expired: Aug 19 5:00 am	Duration: 1 day 0 hrs 44 mins

San Bernardino County 2 alerts

EXTREME HEAT WARNING (2 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 17 1:32 pm	Expired: Aug 18 5:00 am	Duration: 15 hrs 28 mins
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 18 4:16 am	Expired: Aug 19 5:00 am	Duration: 1 day 0 hrs 44 mins

HEAT ADVISORY (2 updates)
Areas affected: San Bernardino and Riverside County Valleys-The Inland Empire
Effective: Aug 18 11:56 am	Expired: Aug 18 10:00 pm	Duration: 10 hrs 04 mins
Areas affected: San Bernardino and Riverside County Valleys-The Inland Empire
Effective: Aug 18 8:47 pm	Expired: Aug 19 6:15 am	Duration: 9 hrs 28 mins

San Luis Obispo County

HEAT ADVISORY (4 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 17 6:13 am	Expired: Aug 20 8:00 pm	Duration: 3 days 13 hrs 47 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 18 1:46 am	Expired: Aug 18 2:00 pm	Duration: 12 hrs 14 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 18 1:02 pm	Expired: Aug 20 8:00 pm	Duration: 2 days 6 hrs 58 mins
Areas affected: Cuyama Valley; Santa Clarita Valley; Southern Salinas Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; 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 18 7:33 pm	Expired: Aug 19 2:00 am	Duration: 6 hrs 27 mins

Santa Barbara County 2 alerts

HEAT ADVISORY (5 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 17 6:13 am	Expired: Aug 20 8:00 pm	Duration: 3 days 13 hrs 47 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 18 1:46 am	Expired: Aug 18 2:00 pm	Duration: 12 hrs 14 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 18 1:02 pm	Expired: Aug 20 8:00 pm	Duration: 2 days 6 hrs 58 mins
Areas affected: Cuyama Valley; Santa Clarita Valley; Southern Salinas Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; 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 18 7:33 pm	Expired: Aug 19 2:00 am	Duration: 6 hrs 27 mins
Areas affected: Santa Ynez Mountains Western Range
Effective: Aug 18 7:33 pm	Expired: Aug 19 2:00 am	Duration: 6 hrs 27 mins

WIND ADVISORY (2 updates)
Areas affected: Santa Ynez Mountains Western Range
Effective: Aug 18 7:33 pm	Expired: Aug 19 2:00 am	Duration: 6 hrs 27 mins
Areas affected: Santa Barbara County Southwestern Coast
Effective: Aug 18 7:33 pm	Expired: Aug 19 2:00 am	Duration: 6 hrs 27 mins

Ventura County

HEAT ADVISORY (4 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 17 6:13 am	Expired: Aug 20 8:00 pm	Duration: 3 days 13 hrs 47 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 18 1:46 am	Expired: Aug 18 2:00 pm	Duration: 12 hrs 14 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 18 1:02 pm	Expired: Aug 20 8:00 pm	Duration: 2 days 6 hrs 58 mins
Areas affected: Cuyama Valley; Santa Clarita Valley; Southern Salinas Valley; San Luis Obispo County Interior Valleys; San Luis Obispo County Mountains; 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 18 7:33 pm	Expired: Aug 19 2:00 am	Duration: 6 hrs 27 mins

Kern County

LAKE WIND ADVISORY (3 updates)
Areas affected: Kern River Valley
Effective: Aug 18 2:25 pm	Expired: Aug 18 10:30 pm	Duration: 8 hrs 05 mins
Areas affected: Kern River Valley
Effective: Aug 18 5:00 pm	Expired: Aug 18 11:00 pm	Duration: 6 hrs 00 mins
The gusty winds prompting the advisory have weakened and are not
Areas affected: Kern River Valley
Effective: Aug 18 10:36 pm	Expired: Aug 18 11:45 pm	Duration: 1 hr 09 mins

Tulare County

LAKE WIND ADVISORY (3 updates)
Areas affected: Kern River Valley
Effective: Aug 18 2:25 pm	Expired: Aug 18 10:30 pm	Duration: 8 hrs 05 mins
Areas affected: Kern River Valley
Effective: Aug 18 5:00 pm	Expired: Aug 18 11:00 pm	Duration: 6 hrs 00 mins
The gusty winds prompting the advisory have weakened and are not
Areas affected: Kern River Valley
Effective: Aug 18 10:36 pm	Expired: Aug 18 11:45 pm	Duration: 1 hr 09 mins

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