Weather alerts in the United States, December 2009

5,551 weather alerts in December 2009, from the National Weather Service and the Storm Prediction Center. Each alert counts once, however many counties it covered.

Weather alerts by state

Each state shaded by its count. Tap a state for its own archive.

Alerts: 5,551
Warnings: 2,332
Watches: 513
Advisories: 2,395
Busiest day: December 9, 2009454 alerts

Over time

By day

Days in UTC, the clock the archive keeps.

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	224
Tornado Warning	135
Tornado Watch	25
Mesoscale Discussion	124
Special Weather Statement	163
Flooding
Areal Flood Warning	106
Flash Flood Warning	155
River Flood Warning	606
Flash Flood Watch	40
Flood Watch	27
River Flood Watch	12
Areal Flood Advisory	196
River Flood Advisory	49
Winter
Blizzard Warning	47
Ice Storm Warning	10
Lake Effect Snow Warning	20
Winter Storm Warning	183
Blizzard Watch	19
Lake Effect Snow Watch	9
Winter Storm Watch	175
Freezing Rain Advisory	60
Lake Effect Snow Advisory	43
Winter Weather Advisory	515
Cold
Freeze Warning	57
Hard Freeze Warning	8
Wind Chill Warning	14
Freeze Watch	30
Hard Freeze Watch	2
Wind Chill Watch	2
Frost Advisory	23
Wind Chill Advisory	109
Wind and dust
Dust Storm Warning	2
High Wind Warning	84
High Wind Watch	52
Blowing Dust Advisory	1
Lake Wind Advisory	49
Wind Advisory	224
Fire
Red Flag Warning	25
Fire Weather Watch	24
Fog and smoke
Air Stagnation Advisory	8
Dense Fog Advisory	187
Freezing Fog Advisory	44
Coast and beach
Coastal Flood Warning	15
High Surf Warning	6
Lakeshore Flood Warning	1
Coastal Flood Watch	8
Lakeshore Flood Watch	1
Coastal Flood Advisory	44
High Surf Advisory	51
Coastal Flood Statement	20
Lakeshore Flood Statement	1
Marine
Gale Warning	320
Hazardous Seas Warning	6
Heavy Freezing Spray Warning	26
Special Marine Warning	226
Storm Warning	56
Gale Watch	81
Hazardous Seas Watch	4
Storm Watch	2
Brisk Wind Advisory	37
Low Water Advisory	12
Marine Dense Fog Advisory	39
Small Craft Advisory	566
Small Craft Advisory for Hazardous Seas	64
Small Craft Advisory for Rough Bar	26
Small Craft Advisory for Winds	48
Marine Weather Statement	3

By state

Every state and territory, with the alerts that covered any part of it. Each state’s page lists every one of them.

14 more states

Nearby

Alerts in force now The tornado archive 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.