Alert archive / Iowa / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 232, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 17, 2026, 4:52 AM CDT for 5 counties in Iowa. It was in force for 53 min. No storm report in the archive falls inside the area while it was in force.
The area
The counties it named.
The facts
- Issued
- Jun 17, 2026, 4:52 AM CDT (09:52 UTC)
- Expired
- Jun 17, 2026, 5:45 AM CDT
- In force
- 53 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Hail
- 1.0 in
- Wind
- 70.0 mph
Counties Boone County, IA, Hamilton County, IA, Hardin County, IA, Marshall County, IA, Story County, IA
The radar
The Des Moines radar (KDMX), 54 km from the middle of the area, began a volume at 09:55 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Jun 17, 3:55 AM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 9.9 hours before the alert went out and 259 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 2278 m above ground
- 0-6 km bulk shear
- 45 kt
- 0-1 km storm-relative helicity
- 55 m²/s²
- 0-3 km storm-relative helicity
- 220 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
What forecasters said that day
The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.
NWS Des Moines, IA wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 17, 1:34 AM CDT, 3 hours 18 minutes earlier.
Area forecast discussion, Jun 17, 1:34 AM CDT, 3 hours 18 minutes before
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</html>Hazardous weather outlook, Jun 16, 3:15 PM CDT, 13 hours 37 minutes before
Hazardous Weather Outlook National Weather Service Des Moines IA 315 PM CDT Tue Jun 16 2026 IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075- 081>086-092>097-172015- Emmet-Kossuth-Winnebago-Worth-Palo Alto-Hancock-Cerro Gordo- Pocahontas-Humboldt-Wright-Franklin-Butler-Bremer-Sac-Calhoun- Webster-Hamilton-Hardin-Grundy-Black Hawk-Crawford-Carroll-Greene- Boone-Story-Marshall-Tama-Audubon-Guthrie-Dallas-Polk-Jasper- Poweshiek-Cass-Adair-Madison-Warren-Marion-Mahaska-Adams-Union- Clarke-Lucas-Monroe-Wapello-Taylor-Ringgold-Decatur-Wayne- Appanoose-Davis- 315 PM CDT Tue Jun 16 2026 This Hazardous Weather Outlook is for portions of central Iowa. .DAY ONE...This afternoon and tonight Thunderstorms are expected late tonight (early Wednesday morning) in north central Iowa moving into eastern Iowa through the morning Wednesday. These storms may become severe with large hail and damaging winds the main threats. .DAYS TWO THROUGH SEVEN...Wednesday through Monday Thunderstorms may redevelop Wednesday afternoon across the eastern half of Iowa. Very large hail, damaging winds, and a few tornadoes are possible. Strong winds are expected on Wednesday ahead of the storms in southern Iowa and behind the storms in northern to portions of central and eastern Iowa with gusts to 30-40 mph or more at times. .SPOTTER INFORMATION STATEMENT... Any storm reports Wednesday are appreciated.
In the hours before
Local storm report, Jun 17, 4:33 AM CDT, 19 minutes before
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</html>The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 17, 12:19 AM CDT | Wind Advisory | DMX | Appanoose, Calhoun, Crawford, Davis, Decatur, Emmet and 6 more | 20 hr |
| Jun 17, 3:53 AM CDT | Severe Thunderstorm Warning | DMX | Calhoun, Pocahontas, Sac | 52 min |
| Jun 17, 4:31 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Calhoun, Greene, Hamilton, Webster | 44 min |
| Jun 17, 5:13 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Greene, Hamilton, Webster | 32 min |
| Jun 17, 5:32 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall, Story, Tama | 43 min |
| Jun 17, 5:34 AM CDT | Severe Thunderstorm Warning | DMX | Boone, Jasper, Marshall, Polk, Story | 41 min |
| Jun 17, 5:43 AM CDT | Severe Thunderstorm Warning | DMX | Grundy, Marshall, Tama | 47 min |
| Jun 17, 5:49 AM CDT | Severe Thunderstorm Warning | DMX | Marshall, Poweshiek, Tama | 56 min |
| Jun 17, 6:08 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Mahaska, Marshall, Poweshiek | 67 min |
| Jun 17, 6:50 AM CDT | Severe Thunderstorm Warning | DMX | Jasper, Mahaska, Marion, Poweshiek | 55 min |
Nearby
Severe Thunderstorm Warnings in Iowa, 2026Every severe thunderstorm warning in 2026
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.