Alert archive / Iowa / Severe Thunderstorm Warnings in 2025

Severe Thunderstorm Warning 28, NWS Omaha, NE

April 1, 2025Washington County, Nebraska; 4 counties in Iowa

NWS Omaha, NE issued this severe thunderstorm warning at Apr 1, 2025, 10:40 PM CDT for Washington County, Nebraska; 4 counties in Iowa. It was in force for 50 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
Apr 1, 2025, 10:40 PM CDT (03:40 UTC)
Expired
Apr 1, 2025, 11:30 PM CDT
In force
50 min
Issued by
NWS Omaha, NE
Area
Storm-based polygon
Damage threat
Considerable
Hail
1.0 in
Wind
70.0 mph

Counties Harrison County, IA, Monona County, IA, Pottawattamie County, IA, Shelby County, IA, Washington County, NE

The radar

The Omaha radar (KOAX), 62 km from the middle of the area, began a volume at 03:42 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.

IssuedProductOfficeLasted
Apr 1, 7:25 PM CDTSevere Thunderstorm WatchSPC10 hr

The nearest sounding before it

Topeka, KS (KTOP), launched 00:00Z, 3.7 hours before the alert went out and 296 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.

Skew-T log-pSkew-T log-p diagram, Topeka, KS at 00:00Z on 2025-04-02Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 0 joules per kilogram.LCL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Topeka, KS at 00:00Z on 2025-04-02The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 356 square meters per square second.1939587897117Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
0 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1178 m above ground
0-6 km bulk shear
69 kt
0-1 km storm-relative helicity
356 m²/s²
0-3 km storm-relative helicity
559 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The office that day

Everything else NWS Omaha, NE issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 1, 8:56 PM CDTSevere Thunderstorm WarningOAXButler, Colfax49 min
Apr 1, 9:21 PM CDTSevere Thunderstorm WarningOAXGage, Jefferson39 min
Apr 1, 9:40 PM CDTSevere Thunderstorm WarningOAXDodge, Saunders36 min
Apr 1, 10:06 PM CDTSevere Thunderstorm WarningOAXBurt, Dodge, Washington39 min
Apr 1, 10:08 PM CDTSevere Thunderstorm WarningOAXGage, Johnson, Nemaha, Otoe14 min
Apr 1, 10:22 PM CDTSevere Thunderstorm WarningOAXColfax, Madison, Platte, Stanton38 min
Apr 1, 11:09 PM CDTSevere Thunderstorm WarningOAXCass, Sarpy51 min
Apr 1, 11:37 PM CDTAreal Flood AdvisoryOAXNemaha, Richardson6 hr
Apr 2, 12:05 AM CDTSevere Thunderstorm WarningOAXMills, Montgomery, Pottawattamie, Shelby27 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2025Severe Thunderstorm Warnings in Nebraska, 2025Every severe thunderstorm warning in 2025

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.