Alameda County Warnings, Watches and Advisories

Do not drive vehicles through flooded areas. The water depth or fast flowing water/mud/debris from a flash flood will make road conditions unsafe. Do not rely soley on data presented here or other third-party websites - always check your official national and local weather service agency website, socials, radio and/or TV stations for making critical decisions related to weather events.

Please carefully read each posted Warning and Alert as it relates to the area(s) being affected. We may provide a wider range of issued severe weather warnings for surrounding cities and counties, so some alerts may not directly impact this location. This is done to help with preparing for severe weather that may overlap or be heading towards Alameda County.

Use the Radar Maps link provided to understand the trajectory of a storm.

High Wind Watch issued January 22 at 2:41AM PST until January 23 at 6:00PM PST by NWS San Diego CA

* WHAT...Northeast winds 30 to 40 mph with gusts to 60 to 70 mph possible. Isolated gusts to 75 to 85 mph for the San Diego County mountains. * WHERE...Orange County Inland Areas, Riverside County Mountains, San Bernardino County Mountains, San Bernardino and Riverside County Valleys-The Inland Empire, San Diego County Mountains, San Diego County Valleys, San Gorgonio Pass Near Banning, and Santa Ana Mountains and Foothills. * WHEN...From Thursday morning through Thursday afternoon. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel could be difficult, especially for high profile vehicles.

Red Flag Warning issued January 22 at 2:25AM PST until January 23 at 8:00PM PST by NWS San Diego CA

* WINDS...Northeast 30 to 40 mph with gusts to 65 mph. Strongest winds are expected during the day on Thursday. * RELATIVE HUMIDITY...As low as 4 percent. * IMPACTS...If fire ignition occurs, conditions are favorable for rapid fire spread and extreme fire behavior. * LOCATION...San Bernardino and Riverside County Valleys -The Inland Empire, San Diego County Inland Valleys, San Bernardino County Mountains-Including The Mountain Top And Front Country Ranger Districts Of The San Bernardino National Forest, Riverside County Mountains-Including The San Jacinto Ranger District Of The San Bernardino National Forest, Santa Ana Mountains-Including The Trabuco Ranger District of the Cleveland National Forest, San Diego County Mountains- Including The Palomar And Descanso Ranger Districts of the Cleveland National Forest, San Gorgonio Pass Near Banning and Orange County Inland Areas.

Wind Advisory issued January 22 at 12:54AM PST until January 22 at 9:00AM PST by NWS Los Angeles/Oxnard CA

* WHAT...Northeast winds 15 to 30 mph with gusts up to 45 mph. * WHERE...Santa Lucia Mountains. * WHEN...Until 9 AM PST this morning. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Freeze Warning issued January 22 at 12:54AM PST until January 22 at 9:00AM PST by NWS Los Angeles/Oxnard CA

* WHAT...Sub-freezing overnight temperatures between 28 and 32 degrees. * WHERE...Ojai Valley. * WHEN...Until 9 AM PST this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Freeze Warning issued January 22 at 12:54AM PST until January 22 at 9:00AM PST by NWS Los Angeles/Oxnard CA

* WHAT...Very cold temperatures between 15 and 20 degrees expected tonight through Wednesday morning. * WHERE...Antelope Valley. * WHEN...Until 9 AM PST this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Wind Advisory issued January 22 at 12:54AM PST until January 22 at 10:00PM PST by NWS Los Angeles/Oxnard CA

* WHAT...For the Wind Advisory, northeast winds 15 to 30 mph with gusts up to 45 mph increasing to 20 to 35 mph with gusts to 55 mph this evening. For the High Wind Warning, northeast winds 35 to 50 mph with gusts up to 65 mph expected. * WHERE...Santa Clarita Valley and Western Santa Monica Mountains Recreational Area. * WHEN...For the Wind Advisory, from 2 PM this afternoon to 10 PM PST this evening. For the High Wind Warning, from 10 PM this evening to 2 PM PST Thursday. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel will be difficult, especially for high profile vehicles. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Wind Advisory issued January 22 at 12:54AM PST until January 22 at 10:00PM PST by NWS Los Angeles/Oxnard CA

* WHAT...For the Wind Advisory, northeast winds 15 to 30 mph with gusts up to 45 mph increasing to 20 to 30 mph with gusts to 55 mph this evening. For the High Wind Warning, northeast winds 35 to 50 mph with gusts up to 65 mph possible. * WHERE...Santa Susana Mountains and Western San Gabriel Mountains and Highway 14 Corridor. * WHEN...For the Wind Advisory, until 10 PM PST this evening. For the High Wind Warning, from 10 PM this evening to 2 PM PST Thursday. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel will be difficult, especially for high profile vehicles. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Wind Advisory issued January 22 at 12:54AM PST until January 22 at 10:00PM PST by NWS Los Angeles/Oxnard CA

* WHAT...For the Wind Advisory, northeast winds 15 to 30 mph with gusts up to 45 mph increasing to 20 to 30 mph with gusts to 55 mph. For the High Wind Warning, northeast winds 20 to 30 mph with gusts up to 50 mph expected. * WHERE...Eastern San Gabriel Mountains, Interstate 5 Corridor, and Southern Ventura County Mountains. * WHEN...For the Wind Advisory, from 2 PM this afternoon to 10 PM PST this evening. For the High Wind Warning, from 10 PM this evening to 2 PM PST Thursday. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel will be difficult, especially for high profile vehicles. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

High Wind Warning issued January 22 at 12:54AM PST until January 23 at 2:00PM PST by NWS Los Angeles/Oxnard CA

* WHAT...For the Wind Advisory, northeast winds 15 to 30 mph with gusts up to 45 mph increasing to 20 to 30 mph with gusts to 55 mph this evening. For the High Wind Warning, northeast winds 35 to 50 mph with gusts up to 65 mph possible. * WHERE...Santa Susana Mountains and Western San Gabriel Mountains and Highway 14 Corridor. * WHEN...For the Wind Advisory, until 10 PM PST this evening. For the High Wind Warning, from 10 PM this evening to 2 PM PST Thursday. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel will be difficult, especially for high profile vehicles. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

High Wind Warning issued January 22 at 12:54AM PST until January 23 at 2:00PM PST by NWS Los Angeles/Oxnard CA

* WHAT...For the Wind Advisory, northeast winds 15 to 30 mph with gusts up to 45 mph increasing to 20 to 30 mph with gusts to 55 mph. For the High Wind Warning, northeast winds 20 to 30 mph with gusts up to 50 mph expected. * WHERE...Eastern San Gabriel Mountains, Interstate 5 Corridor, and Southern Ventura County Mountains. * WHEN...For the Wind Advisory, from 2 PM this afternoon to 10 PM PST this evening. For the High Wind Warning, from 10 PM this evening to 2 PM PST Thursday. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel will be difficult, especially for high profile vehicles. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

High Wind Warning issued January 22 at 12:54AM PST until January 23 at 2:00PM PST by NWS Los Angeles/Oxnard CA

* WHAT...For the Wind Advisory, northeast winds 15 to 30 mph with gusts up to 45 mph increasing to 20 to 35 mph with gusts to 55 mph this evening. For the High Wind Warning, northeast winds 35 to 50 mph with gusts up to 65 mph expected. * WHERE...Santa Clarita Valley and Western Santa Monica Mountains Recreational Area. * WHEN...For the Wind Advisory, from 2 PM this afternoon to 10 PM PST this evening. For the High Wind Warning, from 10 PM this evening to 2 PM PST Thursday. * IMPACTS...Damaging winds could blow down trees and power lines. Widespread power outages are possible. Travel will be difficult, especially for high profile vehicles. Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Wind Advisory issued January 22 at 12:54AM PST until January 23 at 2:00PM PST by NWS Los Angeles/Oxnard CA

* WHAT...East winds 20 to 30 mph with gusts up to 50 mph expected. * WHERE...Northern Ventura County Mountains. * WHEN...From 2 PM this afternoon to 2 PM PST Thursday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Wind Advisory issued January 22 at 12:54AM PST until January 23 at 2:00PM PST by NWS Los Angeles/Oxnard CA

* WHAT...Northeast winds 20 to 30 mph with gusts up to 50 mph expected. Isolated gusts to 60 mph possible in the foothills. * WHERE...Calabasas and Agoura Hills, Central Ventura County Valleys, Eastern Santa Monica Mountains Recreational Area, Malibu Coast, Southeastern Ventura County Valleys, Ventura County Beaches, Ventura County Inland Coast, and Western San Fernando Valley. * WHEN...From 2 PM this afternoon to 2 PM PST Thursday. * IMPACTS...Gusty winds will blow around unsecured objects. Tree limbs could be blown down and a few power outages may result.

Freeze Warning issued January 22 at 12:31AM PST until January 22 at 9:00AM PST by NWS Hanford CA

* WHAT...Sub-freezing temperatures as low as 29 possible. * WHERE...San Joaquin Valley. * WHEN...Until 9 AM PST this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Freeze Warning issued January 22 at 1:07AM MST until January 22 at 9:00AM MST by NWS Phoenix AZ

* WHAT...Sub-freezing temperatures around 30 degrees. * WHERE...In Arizona, Parker Valley. In California, Palo Verde Valley. * WHEN...Until 9 AM MST /8 AM PST/ this morning. * IMPACTS...Frost and freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.

Cold Weather Advisory issued January 21 at 9:30PM PST until January 22 at 9:00AM PST by NWS Eureka CA

* WHAT...Very cold wind chills as low as 25 expected. * WHERE...Southeastern Mendocino Interior and Southern Lake. * WHEN...From 1 AM to 9 AM PST Wednesday. * IMPACTS...Frostbite and hypothermia will occur if unprotected skin is exposed to these temperatures. Wind chill values can lead to hypothermia with prolonged exposure.

Red Flag Warning issued January 21 at 2:35PM PST until January 23 at 8:00PM PST by NWS Los Angeles/Oxnard CA

...RED FLAG WARNING IN EFFECT THROUGH THURSDAY 8 PM PST FOR MOST OF LOS ANGELES AND VENTURA COUNTIES FOR EXTREMELY LOW RELATIVE HUMIDITY AND PERIODS OF GUSTY OFFSHORE WINDS... .The Particularly Dangerous Situation (PDS) Red Flag Warning has ended, but dangerous fire weather conditions will persist through Thursday or Friday. Northeast winds will weaken and shrink in coverage tonight into Wednesday, but will remain locally gusty in the favored hills and mountains. Winds will strengthen and expand once again Wednesday afternoon through Thursday morning, then lower and shrink in coverage again Thursday Night into Friday. Meanwhile, extremely low humidities will persist with minimums under 10 percent over much of the area and poor overnight recoveries. While many areas will see a lull in the winds tonight into Wednesday, the extremely dry conditions will persist and winds will increase again later Wednesday. As result, the Red Flag Warning has been extended over most of Los Angeles and Ventura Counties through 8pm Thursday. Some of the windiest areas may need to be extended into Friday as well. The National Weather Service in Los Angeles/Oxnard has cancelled the Fire Weather Watch, and replaced it with this Red Flag Warning. * WINDS...Northeast will peak at 20 to 30 mph with gusts to 50 mph Wednesday afternoon through Thursday, after a lull later tonight into Wednesday. * RELATIVE HUMIDITY...Daily minimums of 2 to 10 percent common with very poor to minimal overnight recoveries. * IMPACTS...If fire ignition occurs, conditions are favorable for extreme fire behavior and rapid fire growth, which would threaten life and property.

Red Flag Warning issued January 21 at 2:35PM PST until January 23 at 8:00PM PST by NWS Los Angeles/Oxnard CA

...RED FLAG WARNING IN EFFECT THROUGH THURSDAY 8 PM PST FOR MOST OF LOS ANGELES AND VENTURA COUNTIES FOR EXTREMELY LOW RELATIVE HUMIDITY AND PERIODS OF GUSTY OFFSHORE WINDS... .The Particularly Dangerous Situation (PDS) Red Flag Warning has ended, but dangerous fire weather conditions will persist through Thursday or Friday. Northeast winds will weaken and shrink in coverage tonight into Wednesday, but will remain locally gusty in the favored hills and mountains. Winds will strengthen and expand once again Wednesday afternoon through Thursday morning, then lower and shrink in coverage again Thursday Night into Friday. Meanwhile, extremely low humidities will persist with minimums under 10 percent over much of the area and poor overnight recoveries. While many areas will see a lull in the winds tonight into Wednesday, the extremely dry conditions will persist and winds will increase again later Wednesday. As result, the Red Flag Warning has been extended over most of Los Angeles and Ventura Counties through 8pm Thursday. Some of the windiest areas may need to be extended into Friday as well. The National Weather Service in Los Angeles/Oxnard has cancelled the Fire Weather Watch, and replaced it with this Red Flag Warning. * WINDS...Northeast 15 to 25 mph with gusts to 40 mph will increase to 20 to 30 mph with gusts to 50 mph by Wednesday afternoon and continue through Thursday. Isolated gusts of 50 to 65 mph in the favored locations. * RELATIVE HUMIDITY...Daily minimums of 2 to 10 percent common with very poor to minimal overnight recoveries. * IMPACTS...If fire ignition occurs, conditions are favorable for extreme fire behavior and rapid fire growth, which would threaten life and property. * ADDITIONAL DETAILS...Lingering winds and very dry conditions may require an extension of this Red Flag Warning into Friday.

Frost Advisory issued January 21 at 11:26AM PST until January 22 at 10:00AM PST by NWS San Francisco CA

* WHAT...Temperatures as low as 32 will result in frost formation. * WHERE...The East Bay and San Francisco Bay Shoreline, The Central Coast, The Santa Clara Valley and Eastern Hills, The Marin Hills, The Santa Cruz Mountains, North Bay Interior Mountains, Coastal North Bay Including Point Reyes National Seashore, and Northern Salinas Valley/Hollister Valley and Carmel Valley. * WHEN...From midnight tonight to 10 AM PST Wednesday. * IMPACTS...Cold conditions will be hazardous to sensitive populations such as unhoused individuals. Cold Conditions can lead to hypothermia with prolonged exposure.

Freeze Warning issued January 21 at 11:26AM PST until January 22 at 10:00AM PST by NWS San Francisco CA

* WHAT...Sub-freezing temperatures as low as 28 expected. * WHERE...Southern Salinas Valley/Arroyo Seco and Lake San Antonio and North Bay Interior Valleys. * WHEN...From midnight tonight to 10 AM PST Wednesday. * IMPACTS...Cold conditions will be hazardous to sensitive populations such as unhoused individuals. Cold Conditions can lead to hypothermia with prolonged exposure. Freeze conditions could kill crops, other sensitive vegetation and possibly damage unprotected outdoor plumbing.