Weather alerts in California, 2009

2,513 weather alerts in 2009, 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 2009. Tap one for its archive.

Alerts: 2,513
Warnings: 616
Watches: 305
Advisories: 1,434
Busiest month: February316 alerts
Busiest day: June 3, 200938 alerts

Over time

By month

The alerts

2,513 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	148
Severe Thunderstorm Watch	2
Mesoscale Discussion	18
Special Weather Statement	100
Flooding
Areal Flood Warning	2
Flash Flood Warning	52
River Flood Warning	1
Flash Flood Watch	24
Flood Watch	3
Areal Flood Advisory	96
Winter
Winter Storm Warning	53
Winter Storm Watch	52
Freezing Rain Advisory	1
Winter Weather Advisory	126
Heat
Excessive Heat Warning	16
Excessive Heat Watch	6
Heat Advisory	6
Cold
Freeze Warning	32
Hard Freeze Warning	5
Freeze Watch	17
Hard Freeze Watch	2
Frost Advisory	70
Wind and dust
Dust Storm Warning	4
High Wind Warning	66
High Wind Watch	53
Blowing Dust Advisory	4
Lake Wind Advisory	62
Wind Advisory	262
Fire
Red Flag Warning	60
Fire Weather Watch	45
Fog and smoke
Dense Fog Advisory	67
Dense Smoke Advisory	1
Freezing Fog Advisory	4
Coast and beach
High Surf Warning	1
Coastal Flood Advisory	1
High Surf Advisory	46
Coastal Flood Statement	17
Marine
Gale Warning	113
Hazardous Seas Warning	40
Special Marine Warning	21
Storm Warning	2
Gale Watch	71
Hazardous Seas Watch	29
Storm Watch	1
Marine Dense Fog Advisory	1
Small Craft Advisory	435
Small Craft Advisory for Hazardous Seas	117
Small Craft Advisory for Rough Bar	42
Small Craft Advisory for Winds	93
Marine Weather Statement	23

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 2008 2010

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.