Weather alerts in California, 2010

3,393 weather alerts in 2010, 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 2010. Tap one for its archive.

Alerts: 3,393
Warnings: 824
Watches: 398
Advisories: 1,815
Busiest month: January537 alerts
Busiest day: January 20, 201083 alerts

Over time

By month

The alerts

3,393 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	101
Tornado Warning	10
Severe Thunderstorm Watch	1
Tornado Watch	1
Mesoscale Discussion	30
Special Weather Statement	292
Flooding
Areal Flood Warning	7
Flash Flood Warning	126
River Flood Warning	12
Flash Flood Watch	26
Flood Watch	6
River Flood Watch	3
Areal Flood Advisory	233
River Flood Advisory	5
Winter
Winter Storm Warning	116
Blizzard Watch	1
Winter Storm Watch	108
Winter Weather Advisory	208
Heat
Excessive Heat Warning	12
Excessive Heat Watch	15
Heat Advisory	1
Cold
Freeze Warning	35
Freeze Watch	28
Frost Advisory	70
Wind and dust
Dust Storm Warning	2
High Wind Warning	70
High Wind Watch	57
Lake Wind Advisory	70
Wind Advisory	349
Fire
Red Flag Warning	45
Fire Weather Watch	36
Fog and smoke
Dense Fog Advisory	91
Freezing Fog Advisory	6
Coast and beach
Coastal Flood Warning	5
High Surf Warning	6
Coastal Flood Watch	6
Coastal Flood Advisory	8
High Surf Advisory	74
Coastal Flood Statement	34
Marine
Gale Warning	153
Hazardous Seas Warning	43
Special Marine Warning	75
Storm Warning	6
Gale Watch	81
Hazardous Seas Watch	26
Storm Watch	3
Marine Dense Fog Advisory	11
Small Craft Advisory	472
Small Craft Advisory for Hazardous Seas	117
Small Craft Advisory for Rough Bar	61
Small Craft Advisory for Winds	39

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 2009 2011

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.