Alert archive / Iowa / Severe Thunderstorm Warnings in 2026
Severe Thunderstorm Warning 21, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Apr 12, 2026, 2:55 AM CDT for Winnebago County, Worth County, Iowa. It was in force for 26 min. 1 report came from inside the area while it was in force.
The area
The outline as issued, with what was reported inside it.
The facts
- Issued
- Apr 12, 2026, 2:55 AM CDT (07:55 UTC)
- Expired
- Apr 12, 2026, 3:21 AM CDT
- In force
- 26 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.25 in
- Wind
- 50.0 mph
Counties Winnebago County, IA, Worth County, IA
The radar
The Minneapolis radar (KMPX), 157 km from the middle of the area, began a volume at 07:54 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.
What was reported inside it
| Time | Report | Where | Remark |
|---|---|---|---|
| Apr 12, 2:55 AM CDT | HAIL 1.25 | 1 N Thompson, IA | Picture of hail north of Thompson. Relayed by KIOW radio. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 7.9 hours before the alert went out and 157 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
- 528 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 652 m²/s²
- 0-3 km storm-relative helicity
- 891 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
671
WUUS53 KDMX 120755
SVRDMX
IAC189-195-120845-
/O.NEW.KDMX.SV.W.0021.260412T0755Z-260412T0845Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
255 AM CDT Sun Apr 12 2026
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Northwestern Worth County in north central Iowa...
Eastern Winnebago County in north central Iowa...
* Until 345 AM CDT.
* At 254 AM CDT, a severe thunderstorm was located over Thompson, or
9 miles northwest of Forest City, moving northeast at 40 mph.
HAZARD...Half dollar size hail.
SOURCE...Radar indicated.
IMPACT...Damage to vehicles is expected.
* Locations impacted include...
Lake Mills, Emmons, Rice Lake, Thompson, Scarville, Lake Mills
Municipal Airport, Hogsback Wildlife Area, and Rice Lake State
Park.
This includes Interstate 35 between mile markers 216 and 218.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4347 9330 4330 9376 4340 9385 4350 9372
4350 9332
TIME...MOT...LOC 0754Z 243DEG 34KT 4337 9375
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
Fowle3 follow-up statements
699
WWUS53 KDMX 120801
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
301 AM CDT Sun Apr 12 2026
IAC189-195-120845-
/O.CON.KDMX.SV.W.0021.000000T0000Z-260412T0845Z/
Worth IA-Winnebago IA-
301 AM CDT Sun Apr 12 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 AM CDT
FOR NORTHWESTERN WORTH AND NORTHEASTERN WINNEBAGO COUNTIES...
At 301 AM CDT, a severe thunderstorm was located 5 miles southwest of
Scarville, or 11 miles north of Forest City, moving northeast at 40
mph.
HAZARD...Ping pong ball size hail.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect damage
to roofs, siding, windows, and vehicles.
Locations impacted include...
Lake Mills, Emmons, Rice Lake, Leland, Scarville, Lake Mills
Municipal Airport, Hogsback Wildlife Area, and Rice Lake State Park.
This includes Interstate 35 between mile markers 216 and 218.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
&&
LAT...LON 4333 9367 4343 9381 4350 9372 4350 9332
4347 9330
TIME...MOT...LOC 0801Z 239DEG 34KT 4341 9368
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
Fowle807
WWUS53 KDMX 120808
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
308 AM CDT Sun Apr 12 2026
IAC189-195-120845-
/O.CON.KDMX.SV.W.0021.000000T0000Z-260412T0845Z/
Worth IA-Winnebago IA-
308 AM CDT Sun Apr 12 2026
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 AM CDT
FOR NORTHWESTERN WORTH AND NORTHEASTERN WINNEBAGO COUNTIES...
At 308 AM CDT, a severe thunderstorm was located over Scarville, or
14 miles north of Forest City, moving northeast at 40 mph.
HAZARD...Ping pong ball size hail.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect damage
to roofs, siding, windows, and vehicles.
Locations impacted include...
Lake Mills, Emmons, Scarville, and Hogsback Wildlife Area.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Prepare immediately for large hail and deadly cloud to ground
lightning. Seek shelter inside a well-built structure. Stay away from
windows.
&&
LAT...LON 4337 9362 4347 9376 4350 9372 4350 9336
TIME...MOT...LOC 0808Z 235DEG 33KT 4347 9363
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH
$$
Fowle220 WWUS53 KDMX 120821 SVSDMX Severe Weather Statement National Weather Service Des Moines IA 321 AM CDT Sun Apr 12 2026 IAC189-195-120830- /O.CAN.KDMX.SV.W.0021.000000T0000Z-260412T0845Z/ Worth IA-Winnebago IA- 321 AM CDT Sun Apr 12 2026 ...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN WORTH AND NORTHEASTERN WINNEBAGO COUNTIES IS CANCELLED... The storm which prompted the warning has moved out of the area. Therefore, the warning has been cancelled. LAT...LON 4337 9362 4347 9376 4350 9372 4350 9336 TIME...MOT...LOC 0818Z 243DEG 34KT 4352 9348 $$ Fowle
The office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Apr 12, 1:56 AM CDT | Special Weather Statement | DMX | Hancock, Humboldt, Kossuth, Winnebago | 64 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.