Weather alerts in California, 2011

3,086 weather alerts in 2011, 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 2011. Tap one for its archive.

Alerts: 3,086
Warnings: 715
Watches: 362
Advisories: 1,602
Busiest month: March480 alerts
Busiest day: September 13, 201164 alerts

Over time

By month

The alerts

3,086 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	118
Tornado Warning	11
Severe Thunderstorm Watch	1
Mesoscale Discussion	19
Special Weather Statement	372
Flooding
Areal Flood Warning	5
Flash Flood Warning	122
River Flood Warning	25
Flash Flood Watch	35
Flood Watch	8
River Flood Watch	6
Areal Flood Advisory	176
River Flood Advisory	3
Winter
Winter Storm Warning	63
Winter Storm Watch	65
Winter Weather Advisory	168
Heat
Excessive Heat Warning	13
Excessive Heat Watch	10
Heat Advisory	3
Cold
Freeze Warning	46
Hard Freeze Warning	7
Freeze Watch	21
Hard Freeze Watch	4
Frost Advisory	69
Wind and dust
Dust Storm Warning	8
High Wind Warning	80
High Wind Watch	74
Blowing Dust Advisory	2
Lake Wind Advisory	90
Wind Advisory	332
Fire
Red Flag Warning	60
Fire Weather Watch	51
Fog and smoke
Air Stagnation Advisory	1
Dense Fog Advisory	126
Freezing Fog Advisory	2
Coast and beach
High Surf Warning	1
Coastal Flood Advisory	5
High Surf Advisory	51
Tsunami Advisory	1
Coastal Flood Statement	16
Marine
Gale Warning	91
Hazardous Seas Warning	15
Special Marine Warning	47
Storm Warning	3
Gale Watch	79
Hazardous Seas Watch	4
Storm Watch	4
Marine Dense Fog Advisory	14
Small Craft Advisory	459
Small Craft Advisory for Hazardous Seas	51
Small Craft Advisory for Rough Bar	41
Small Craft Advisory for Winds	8

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 2010 2012

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.