Weather alerts in California, 2017

4,447 weather alerts in 2017, 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 2017. Tap one for its archive.

Alerts: 4,447
Warnings: 1,299
Watches: 449
Advisories: 1,853
Busiest month: January858 alerts
Busiest day: January 9, 201787 alerts

Over time

By month

The alerts

4,447 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	160
Tornado Warning	7
Mesoscale Discussion	11
Special Weather Statement	768
Flooding
Areal Flood Warning	97
Flash Flood Warning	258
River Flood Warning	118
Flash Flood Watch	50
Flood Watch	36
River Flood Watch	19
Areal Flood Advisory	360
River Flood Advisory	9
Winter
Blizzard Warning	2
Winter Storm Warning	75
Winter Storm Watch	54
Freezing Rain Advisory	2
Winter Weather Advisory	114
Heat
Excessive Heat Warning	35
Excessive Heat Watch	28
Heat Advisory	48
Cold
Freeze Warning	54
Hard Freeze Warning	13
Freeze Watch	13
Hard Freeze Watch	9
Frost Advisory	78
Wind and dust
Dust Storm Warning	3
High Wind Warning	81
High Wind Watch	58
Blowing Dust Advisory	10
Lake Wind Advisory	55
Wind Advisory	371
Fire
Red Flag Warning	128
Fire Weather Watch	93
Fog and smoke
Air Stagnation Advisory	1
Dense Fog Advisory	75
Dense Smoke Advisory	4
Freezing Fog Advisory	2
Coast and beach
Coastal Flood Warning	5
High Surf Warning	5
Coastal Flood Watch	3
Coastal Flood Advisory	17
High Surf Advisory	43
Beach Hazards Statement	67
Marine
Gale Warning	130
Hazardous Seas Warning	30
Special Marine Warning	91
Storm Warning	7
Gale Watch	78
Hazardous Seas Watch	4
Storm Watch	4
Marine Dense Fog Advisory	3
Small Craft Advisory	606
Small Craft Advisory for Hazardous Seas	24
Small Craft Advisory for Rough Bar	23
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 2016 2018

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.