Alert archive / Iowa / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 27, NWS Des Moines, IA

April 30, 2024Adair County, Cass County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 30, 2024, 12:05 PM CDT for Adair County, Cass County, Iowa. It was in force for 40 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 30, 2024, 12:05 PM CDT (17:05 UTC)
Expired
Apr 30, 2024, 12:45 PM CDT
In force
40 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

Counties Adair County, IA, Cass County, IA

The radar

The Des Moines radar (KDMX), 93 km from the middle of the area, began a volume at 17:04 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 nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 5.1 hours before the alert went out and 139 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, Omaha, NE at 12:00Z on 2024-04-30Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2 joules per kilogram.LCLLFCEL10008507005003002001001 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, Omaha, NE at 12:00Z on 2024-04-30The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 164 square meters per square second.19395878Sfc1 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
2 J/kg
Mixed-layer CIN
-289 J/kg
Mixed-layer LCL
1819 m above ground
0-6 km bulk shear
44 kt
0-1 km storm-relative helicity
164 m²/s²
0-3 km storm-relative helicity
119 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

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 Apr 30, 6:18 AM CDT, 5 hours 47 minutes earlier.

Area forecast discussion, Apr 30, 6:18 AM CDT, 5 hours 47 minutes before
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Hazardous weather outlook, Apr 30, 4:04 AM CDT, 8 hours 1 minute before
Hazardous Weather Outlook
National Weather Service Des Moines IA
404 AM CDT Tue Apr 30 2024

IAZ004>007-015>017-023>028-033>039-044>050-057>062-070>075-
081>086-092>097-010915-
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-
404 AM CDT Tue Apr 30 2024

This Hazardous Weather Outlook is for portions of central Iowa.

.DAY ONE...Today and tonight

Thunderstorm chances increase by late afternoon and through the
evening hours. Some of the storms will likely be strong to severe
and capable of producing large hail and damaging winds. A few
tornadoes are possible as well.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Showers and thunderstorms are likely late Wednesday through
Thursday, followed by lower end chances late in the week and
into the weekend. The severe weather threat looks low at this
time, but will continue to be evaluated in the coming days.
Moderate to locally heavy rains are anticipated which may lead to
standing water on fields and roads, as well as within bank rises
on rivers and streams.

.SPOTTER INFORMATION STATEMENT...

Spotters may be needed late this afternoon and evening.

The office that day

Everything else NWS Des Moines, IA issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Apr 30, 12:46 PM CDTSpecial Weather StatementDMXAdair44 min
Apr 30, 3:58 PM CDTSevere Thunderstorm WarningDMXAdams, Cass47 min
Apr 30, 4:00 PM CDTSevere Thunderstorm WarningDMXCrawford45 min
Apr 30, 4:32 PM CDTSevere Thunderstorm WarningDMXCarroll, Crawford, Sac43 min
Apr 30, 4:39 PM CDTSevere Thunderstorm Warning Considerable damage threatDMXAdair, Adams, Cass, Union51 min
Apr 30, 4:55 PM CDTSevere Thunderstorm WarningDMXAudubon, Carroll, Crawford, Greene, Guthrie50 min
Apr 30, 5:07 PM CDTSevere Thunderstorm WarningDMXAdams, Ringgold, Taylor, Union38 min
Apr 30, 5:13 PM CDTSpecial Weather StatementDMXEmmet, Palo Alto32 min
Apr 30, 5:19 PM CDTSevere Thunderstorm Warning Considerable damage threatDMXAdair, Clarke, Madison, Union41 min
Apr 30, 5:39 PM CDTSevere Thunderstorm WarningDMXBoone, Carroll, Dallas, Greene, Guthrie51 min
Apr 30, 5:45 PM CDTSevere Thunderstorm WarningDMXClarke, Decatur, Ringgold, Union45 min
Apr 30, 5:49 PM CDTSevere Thunderstorm Warning Considerable damage threatDMXClarke, Lucas, Madison, Union, Warren41 min
Apr 30, 5:58 PM CDTSevere Thunderstorm WarningDMXAdair, Clarke, Madison, Union32 min
Apr 30, 6:10 PM CDTSpecial Weather StatementDMXKossuth, Palo Alto, Winnebago50 min
Apr 30, 6:17 PM CDTSevere Thunderstorm WarningDMXAdams, Ringgold, Taylor, Union43 min
Apr 30, 6:23 PM CDTSevere Thunderstorm Warning Considerable damage threatDMXClarke, Lucas, Madison, Marion, Warren67 min
Apr 30, 6:24 PM CDTSevere Thunderstorm WarningDMXBoone, Hamilton, Hardin, Marshall, Story51 min
Apr 30, 6:26 PM CDTSevere Thunderstorm WarningDMXClarke, Decatur, Lucas, Wayne64 min
Apr 30, 6:41 PM CDTSevere Thunderstorm WarningDMXAdair, Clarke, Decatur, Madison, Ringgold, Union34 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2024Every severe thunderstorm warning in 2024

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.