Weather alerts in California, 2020

3,070 weather alerts in 2020, 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 2020. Tap one for its archive.

Alerts: 3,070
Warnings: 676
Watches: 401
Advisories: 1,465
Busiest month: August391 alerts
Busiest day: August 16, 202051 alerts

Over time

By month

The alerts

3,070 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	67
Tornado Warning	4
Mesoscale Discussion	5
Special Weather Statement	468
Flooding
Areal Flood Warning	6
Flash Flood Warning	68
River Flood Warning	2
Flash Flood Watch	21
Flood Watch	2
Areal Flood Advisory	138
Winter
Snow Squall Warning	1
Winter Storm Warning	43
Winter Storm Watch	40
Winter Weather Advisory	113
Heat
Excessive Heat Warning	51
Excessive Heat Watch	48
Heat Advisory	55
Cold
Freeze Warning	65
Hard Freeze Warning	15
Freeze Watch	35
Hard Freeze Watch	10
Frost Advisory	78
Wind and dust
High Wind Warning	47
High Wind Watch	44
Blowing Dust Advisory	7
Dust Storm Advisory	6
Lake Wind Advisory	47
Wind Advisory	309
Fire
Red Flag Warning	138
Fire Weather Watch	114
Fog and smoke
Dense Fog Advisory	117
Dense Smoke Advisory	12
Freezing Fog Advisory	7
Coast and beach
Coastal Flood Warning	2
High Surf Warning	2
Coastal Flood Advisory	10
High Surf Advisory	40
Beach Hazards Statement	55
Marine
Gale Warning	109
Hazardous Seas Warning	28
Special Marine Warning	25
Storm Warning	3
Gale Watch	75
Hazardous Seas Watch	10
Storm Watch	2
Marine Dense Fog Advisory	1
Small Craft Advisory	525

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 2019 2021

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.