Weather alerts in McHenry County, Illinois

3,210 weather alerts since 1986, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

McHenry County and its neighbors

Each county as a circle sized by its count since 1986. Tap one for its archive.

Alerts: 3,210
Warnings: 814
Watches: 561
Advisories: 918
Busiest year: 2008191 alerts
Average year: 78over 41 years on file

Over time

By year

Before late 2005 the archive holds only tornado, severe thunderstorm, flash flood and marine warnings, and from 1997 SPC's watches, so the jump that year is the archive widening, not the weather.

By month of the year

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	427
Tornado Warning	52
Severe Thunderstorm Watch	257
Tornado Watch	84
Mesoscale Discussion	726
Special Weather Statement	191
Flooding
Areal Flood Warning	34
Flash Flood Warning	76
River Flood Warning	49
Flash Flood Watch	61
Flood Watch	39
River Flood Watch	14
Areal Flood Advisory	145
River Flood Advisory	40
Winter
Blizzard Warning	7
Heavy Snow Warning	3
Ice Storm Warning	4
Snow Squall Warning	2
Winter Storm Warning	55
Blizzard Watch	3
Winter Storm Watch	57
Blowing Snow Advisory	2
Freezing Rain Advisory	16
Snow Advisory	17
Snow and Blowing Snow Advisory	3
Winter Weather Advisory	153
Heat
Excessive Heat Warning	7
Extreme Heat Warning	2
Excessive Heat Watch	6
Extreme Heat Watch	1
Heat Advisory	35
Cold
Extreme Cold Warning	2
Freeze Warning	44
Wind Chill Warning	13
Extreme Cold Watch	1
Freeze Watch	15
Wind Chill Watch	6
Cold Weather Advisory	9
Frost Advisory	67
Wind Chill Advisory	76
Wind and dust
High Wind Warning	19
High Wind Watch	8
Blowing Dust Advisory	1
Wind Advisory	119
Fire
Red Flag Warning	18
Fire Weather Watch	9
Fog and smoke
Dense Fog Advisory	227
Freezing Fog Advisory	8

The latest warnings

The most recent on file, newest first.

Issued	Product	Office	Lasted
Aug 21, 2:17 PM CDT	Severe Thunderstorm Warning	LOT	43 min
Aug 11, 9:38 AM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	67 min
Aug 11, 3:49 AM CDT	Severe Thunderstorm Warning	LOT	27 min
Aug 11, 3:11 AM CDT	Severe Thunderstorm Warning	LOT	51 min
Jul 27, 11:25 AM CDT	Severe Thunderstorm Warning Considerable damage threat	LOT	80 min
Jul 27, 10:57 AM CDT	Severe Thunderstorm Warning	LOT	78 min
Jul 27, 2:10 AM CDT	Extreme Heat Warning	LOT	19 hr
Jul 4, 1:53 PM CDT	Severe Thunderstorm Warning	LOT	40 min
Jul 3, 7:33 PM CDT	Severe Thunderstorm Warning	LOT	30 min
Jun 28, 11:18 AM CDT	Extreme Heat Warning	LOT	5 days
Jun 24, 5:35 PM CDT	Severe Thunderstorm Warning	LOT	55 min
Jun 24, 4:54 PM CDT	Severe Thunderstorm Warning	LOT	51 min

Nearby

Alerts in force now Tornadoes on record Forecast The radar archive

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.