Weather alerts in Johnson County, Iowa

3,761 weather alerts since 1986, from the National Weather Service and the Storm Prediction Center. An alert counts here when it covered this county.

Johnson County and its neighbors

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

Alerts: 3,761
Warnings: 1,084
Watches: 717
Advisories: 773
Busiest year: 2008273 alerts
Average year: 92over 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	464
Tornado Warning	85
Severe Thunderstorm Watch	298
Tornado Watch	132
Mesoscale Discussion	803
Special Weather Statement	384
Flooding
Areal Flood Warning	17
Flash Flood Warning	85
River Flood Warning	246
Flash Flood Watch	100
Flood Watch	33
River Flood Watch	45
River Flood Advisory	8
Winter
Blizzard Warning	10
Ice Storm Warning	6
Snow Squall Warning	3
Winter Storm Warning	50
Blizzard Watch	3
Winter Storm Watch	62
Blowing Snow Advisory	6
Freezing Rain Advisory	9
Snow Advisory	15
Snow and Blowing Snow Advisory	4
Winter Weather Advisory	180
Heat
Excessive Heat Warning	16
Extreme Heat Warning	4
Excessive Heat Watch	9
Extreme Heat Watch	4
Heat Advisory	81
Cold
Extreme Cold Warning	3
Freeze Warning	48
Wind Chill Warning	14
Extreme Cold Watch	2
Freeze Watch	12
Wind Chill Watch	4
Cold Weather Advisory	10
Frost Advisory	41
Wind Chill Advisory	94
Wind and dust
High Wind Warning	13
High Wind Watch	7
Wind Advisory	119
Fire
Red Flag Warning	20
Fire Weather Watch	6
Fog and smoke
Air Stagnation Advisory	2
Dense Fog Advisory	202
Freezing Fog Advisory	2

The latest warnings

The most recent on file, newest first.

Issued	Product	Office	Lasted
Sep 20, 8:04 AM CDT	Areal Flood Warning	DVN	6 hr
Sep 20, 7:55 AM CDT	Areal Flood Warning	DVN	6 hr
Sep 20, 5:43 AM CDT	River Flood Warning	DVN	4 days
Sep 20, 5:17 AM CDT	River Flood Warning	DVN	4 days
Sep 20, 2:02 AM CDT	Flash Flood Warning	DVN	6 hr
Sep 20, 1:18 AM CDT	Severe Thunderstorm Warning	DVN	57 min
Sep 20, 12:16 AM CDT	Flash Flood Warning	DVN	8 hr
Sep 8, 9:07 PM CDT	Severe Thunderstorm Warning Considerable damage threat	DVN	46 min
Sep 8, 8:50 PM CDT	Tornado Warning	DVN	25 min
Sep 8, 8:18 PM CDT	Severe Thunderstorm Warning	DVN	57 min
Sep 2, 2:02 AM CDT	Extreme Heat Warning	DVN	4 days
Aug 14, 3:24 PM CDT	River Flood Warning	DVN	3 days

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.