Weather alerts in Illinois, 2009

2,592 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: 2,592
Warnings: 1,432
Watches: 214
Advisories: 602
Busiest month: June526 alerts
Busiest day: June 19, 2009108 alerts

Over time

By month

The alerts

2,592 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	505
Tornado Warning	108
Severe Thunderstorm Watch	45
Tornado Watch	23
Mesoscale Discussion	190
Special Weather Statement	148
Flooding
Areal Flood Warning	61
Flash Flood Warning	151
River Flood Warning	490
Flash Flood Watch	45
Flood Watch	13
River Flood Watch	32
Areal Flood Advisory	178
River Flood Advisory	93
Winter
Blizzard Warning	3
Ice Storm Warning	1
Winter Storm Warning	15
Blizzard Watch	4
Winter Storm Watch	17
Freezing Rain Advisory	4
Lake Effect Snow Advisory	3
Winter Weather Advisory	47
Heat
Excessive Heat Warning	1
Excessive Heat Watch	1
Heat Advisory	20
Cold
Freeze Warning	12
Wind Chill Warning	4
Freeze Watch	5
Wind Chill Watch	1
Frost Advisory	15
Wind Chill Advisory	18
Wind and dust
High Wind Warning	4
High Wind Watch	1
Lake Wind Advisory	7
Wind Advisory	34
Fog and smoke
Dense Fog Advisory	60
Freezing Fog Advisory	3
Coast and beach
Lakeshore Flood Advisory	2
Lakeshore Flood Statement	3
Marine
Gale Warning	38
Heavy Freezing Spray Warning	4
Special Marine Warning	31
Storm Warning	4
Gale Watch	25
Heavy Freezing Spray Watch	1
Storm Watch	1
Marine Dense Fog Advisory	7
Small Craft Advisory	111
Marine Weather Statement	3

By county

Every county with at least one alert. A county page lists each alert that covered it.

62 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.