Weather alerts in California, 2012
3,401 weather alerts in 2012, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered any part of the state, so the counties below add up to more than the state.
Weather alerts by county
Each county as a circle sized by its count in 2012. Tap one for its archive.
- Alerts
- 3,401
- Warnings
- 955
- Watches
- 421
- Advisories
- 1,696
- Busiest month
- December471 alerts
- Busiest day
- October 11, 201244 alerts
Over time
By month
The alerts
3,401 alerts are too many to list on one page. Narrow it to a product above, to a month in the chart, or to a county.
By product
Every kind of product issued here, grouped by hazard. Each opens the same place narrowed to that product.
By county
Every county with at least one alert. A county page lists each alert that covered it.
- San Bernardino County446
- Riverside County296
- San Diego County264
- Siskiyou County202
- Modoc County156
- Nevada County146
- Placer County142
- El Dorado County133
- Inyo County116
- Alpine County112
- Los Angeles County102
- Sierra County83
- Lassen County82
- Plumas County71
- Imperial County70
- Orange County69
- Monterey County68
- Santa Cruz County63
- Sonoma County56
- Mono County56
- Marin County51
- San Mateo County49
- Mendocino County39
- Kings County38
- Humboldt County36
- Santa Clara County35
- Kern County35
- Santa Barbara County35
- Napa County33
- Fresno County31
- City and County of San Francisco30
- Tulare County30
- Del Norte County28
- Alameda County23
- San Benito County23
- Shasta County23
- Merced County22
- Tehama County22
- Contra Costa County21
- Yuba County20
18 more counties
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20112013
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.