Winter Storm Warnings in California
1,335 winter storm warnings since 1986. An alert counts here when it covered any part of the state, so the counties below add up to more than the state. The archive of winter storm warnings reaches back to 2005.
Winter Storm Warnings by county
Each county as a circle sized by its count since 1986. Tap one for its archive.
- Winter Storm Warnings
- 1,335
- Busiest year
- 2010116 winter storm warnings
- Average year
- 61over 22 years on file
Over time
By year
Before late 2005 the archive holds only tornado, severe thunderstorm, flash flood and marine warnings, and from 1997 SPC's watches, so the jump that year is the archive widening, not the weather.
By month of the year
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Siskiyou County206
- Alpine County164
- Nevada County164
- El Dorado County164
- Placer County164
- Mono County135
- San Bernardino County127
- Plumas County111
- Sierra County111
- Lassen County111
- Inyo County101
- Riverside County94
- Modoc County76
- Fresno County54
- Tuolumne County53
- Madera County53
- Mariposa County53
- Tulare County51
- San Diego County49
- Trinity County47
- Kern County39
- Humboldt County31
- Del Norte County29
- Mendocino County27
- Los Angeles County13
- Lake County10
- Santa Barbara County9
- Ventura County9
- Orange County4
- Monterey County2
- San Mateo County1
- Santa Clara County1
- San Benito County1
- San Luis Obispo County1
- Santa Cruz County1
- Alameda County1
- Contra Costa County1
- Marin County1
- Napa County1
- Sonoma County1
The latest winter storm warnings
The most recent on file, newest first.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 20, 9:10 AM PDT | Winter Storm Warning | HNX | Fresno, Madera, Mariposa, Tulare, Tuolumne | 48 hr |
| Apr 20, 8:56 AM PDT | Winter Storm Warning | STO | Alpine, Amador, Butte, Calaveras, El Dorado, Lassen and 7 more | 51 hr |
| Apr 10, 8:21 AM PDT | Winter Storm Warning | REV | Alpine, El Dorado, Mono, Nevada, Placer | 63 hr |
| Apr 9, 11:46 AM PDT | Winter Storm Warning | STO | 3 days | |
| Apr 9, 10:52 AM PDT | Winter Storm Warning | HNX | Fresno, Kern, Madera, Mariposa, Tulare, Tuolumne | 4 days |
| Feb 20, 11:47 AM PST | Winter Storm Warning | MFR | Siskiyou | 25 hr |
| Feb 20, 11:11 AM PST | Winter Storm Warning | EKA | 52 hr | |
| Feb 15, 9:57 AM PST | Winter Storm Warning | SGX | Riverside, San Bernardino | 5 days |
| Feb 15, 8:59 AM PST | Winter Storm Warning | LOX | Los Angeles, Santa Barbara, Ventura | 5 days |
| Feb 14, 1:08 PM PST | Winter Storm Warning | MFR | Siskiyou | 5 days |
| Feb 14, 12:37 PM PST | Winter Storm Warning | VEF | Inyo | 4 days |
| Feb 14, 12:28 PM PST | Winter Storm Warning | EKA | Del Norte, Humboldt, Lake, Mendocino, Trinity | 5 days |
Nearby
Sources
National Weather Service watches, warnings, advisories and statements from the Iowa Environmental Mesonet's VTEC archive, which reconstructs tornado, severe thunderstorm, flash flood and marine warnings back to 1986 from the NWS text archive. Storm Prediction Center watches and mesoscale discussions from SPC's archive through the Mesonet. County centers from the US Census Bureau. Rebuilt daily.