Weather alerts in Iowa, 2018
2,912 weather alerts in 2018, 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 2018. Tap one for its archive.
- Alerts
- 2,912
- Warnings
- 1,364
- Watches
- 281
- Advisories
- 346
- Busiest month
- June735 alerts
- Busiest day
- September 20, 201884 alerts
Over time
By month
The alerts
2,912 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 | 597 |
| Tornado Warning | 124 |
| Severe Thunderstorm Watch | 27 |
| Tornado Watch | 14 |
| Mesoscale Discussion | 158 |
| Special Weather Statement | 763 |
| Flooding | |
| Areal Flood Warning | 57 |
| Flash Flood Warning | 84 |
| River Flood Warning | 436 |
| Flash Flood Watch | 46 |
| Flood Watch | 7 |
| River Flood Watch | 144 |
| Areal Flood Advisory | 19 |
| River Flood Advisory | 20 |
| Winter | |
| Blizzard Warning | 9 |
| Winter Storm Warning | 33 |
| Winter Storm Watch | 40 |
| Winter Weather Advisory | 132 |
| Heat | |
| Excessive Heat Warning | 4 |
| Heat Advisory | 32 |
| Cold | |
| Freeze Warning | 9 |
| Wind Chill Warning | 2 |
| Freeze Watch | 2 |
| Frost Advisory | 8 |
| Wind Chill Advisory | 23 |
| Wind and dust | |
| High Wind Warning | 3 |
| Wind Advisory | 36 |
| Fire | |
| Red Flag Warning | 6 |
| Fire Weather Watch | 1 |
| Fog and smoke | |
| Dense Fog Advisory | 76 |
By county
Every county with at least one alert. A county page lists each alert that covered it.
- Louisa County203
- Polk County202
- Johnson County199
- Scott County197
- Linn County196
- Pottawattamie County188
- Cedar County186
- Muscatine County182
- Clinton County181
- Iowa County180
- Story County179
- Benton County178
- Washington County177
- Delaware County174
- Clay County170
- Dallas County169
- Mills County168
- Boone County167
- Webster County167
- Jones County166
- Buchanan County164
- Humboldt County164
- Wright County164
- Jackson County163
- Keokuk County161
- Black Hawk County161
- Pocahontas County159
- Des Moines County158
- Greene County157
- Jasper County157
- Dubuque County156
- Cerro Gordo County155
- Kossuth County155
- Harrison County155
- Franklin County153
- Hamilton County153
- Hancock County152
- Fremont County152
- Marshall County150
- Floyd County149
59 more counties
- Calhoun County149
- Dickinson County147
- Tama County147
- Winneshiek County145
- Butler County145
- Hardin County144
- Worth County144
- Montgomery County144
- Guthrie County142
- Palo Alto County142
- Clayton County141
- Lee County141
- Carroll County141
- Mahaska County140
- Madison County139
- Winnebago County139
- Shelby County139
- Henry County138
- Poweshiek County137
- Warren County137
- Plymouth County136
- Mitchell County136
- Marion County135
- Lyon County134
- Adair County134
- Howard County133
- Sioux County132
- Grundy County132
- Bremer County130
- Emmet County130
- Cass County129
- Chickasaw County128
- Audubon County127
- O'Brien County125
- Fayette County125
- Allamakee County124
- Jefferson County124
- Union County122
- Page County122
- Buena Vista County121
- Ringgold County117
- Sac County116
- Crawford County116
- Osceola County115
- Clarke County115
- Adams County115
- Lucas County113
- Monona County113
- Decatur County111
- Cherokee County109
- Van Buren County108
- Wapello County107
- Taylor County106
- Monroe County105
- Wayne County104
- Woodbury County97
- Appanoose County94
- Davis County93
- Ida County89
The busiest days
Days with the most alerts issued, by UTC date.
Nearby
Alerts in force nowTornadoes on recordThe radar archive20172019
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.