Weather alerts in California, 2021

3,564 weather alerts in 2021, 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 2021. Tap one for its archive.

Alerts: 3,564
Warnings: 902
Watches: 495
Advisories: 1,850
Busiest month: December456 alerts
Busiest day: December 14, 202146 alerts

Over time

By month

The alerts

3,564 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.

Product	Alerts
Severe storms
Severe Thunderstorm Warning	51
Tornado Warning	3
Mesoscale Discussion	8
Special Weather Statement	265
Flooding
Areal Flood Warning	16
Flash Flood Warning	154
River Flood Warning	4
Flash Flood Watch	41
Flood Watch	14
River Flood Watch	1
Areal Flood Advisory	242
Winter
Blizzard Warning	3
Winter Storm Warning	71
Winter Storm Watch	79
Winter Weather Advisory	146
Heat
Excessive Heat Warning	61
Excessive Heat Watch	54
Heat Advisory	55
Cold
Freeze Warning	45
Hard Freeze Warning	13
Freeze Watch	30
Hard Freeze Watch	10
Frost Advisory	89
Wind and dust
Blowing Dust Warning	1
Dust Storm Warning	9
High Wind Warning	71
High Wind Watch	49
Blowing Dust Advisory	14
Dust Storm Advisory	11
Lake Wind Advisory	53
Wind Advisory	389
Fire
Red Flag Warning	117
Fire Weather Watch	91
Fog and smoke
Dense Fog Advisory	141
Freezing Fog Advisory	3
Coast and beach
High Surf Warning	7
Coastal Flood Watch	1
Coastal Flood Advisory	20
High Surf Advisory	45
Beach Hazards Statement	44
Marine
Gale Warning	166
Hazardous Seas Warning	68
Special Marine Warning	35
Storm Warning	7
Gale Watch	108
Hazardous Seas Watch	13
Storm Watch	4
Marine Dense Fog Advisory	6
Small Craft Advisory	636

By county

Every county with at least one alert. A county page lists each alert that covered it.

18 more counties

The busiest days

Days with the most alerts issued, by UTC date.

Nearby

Alerts in force now Tornadoes on record The radar archive 2020 2022

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.