Alert archive / Iowa / Severe Thunderstorm Warnings in 2024

Severe Thunderstorm Warning 21, NWS Des Moines, IA

April 27, 20244 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Apr 27, 2024, 3:44 PM CDT for 4 counties in Iowa. It was in force for 46 min. 2 reports 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 27, 2024, 3:44 PM CDT (20:44 UTC)
Expired
Apr 27, 2024, 4:30 PM CDT
In force
46 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

Counties Jasper County, IA, Mahaska County, IA, Marion County, IA, Poweshiek County, IA

The radar

The Des Moines radar (KDMX), 78 km from the middle of the area, began a volume at 20:47 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

TimeReportWhereRemark
Apr 27, 3:57 PM CDTHAIL 1Sully, IAQuarter sized hail near Sully.
Apr 27, 4:00 PM CDTHAIL 1.5Sully, IADelayed Report. Exact location not provided, only town was given.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Apr 27, 1:40 PM CDTTornado WatchSPC7 hr

The nearest sounding before it

Davenport, (KDVN), launched 12:00Z, 8.7 hours before the alert went out and 195 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, Davenport, at 12:00Z on 2024-04-27Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 392 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, Davenport, at 12:00Z on 2024-04-27The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 288 square meters per square second.1939587897Sfc1 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
392 J/kg
Mixed-layer CIN
-132 J/kg
Mixed-layer LCL
673 m above ground
0-6 km bulk shear
37 kt
0-1 km storm-relative helicity
288 m²/s²
0-3 km storm-relative helicity
385 m²/s²
Significant tornado parameter
0.2
Supercell composite
1.5

Open this sounding in Storm Lab

The text

As transmitted.

101 
WUUS53 KDMX 272044
SVRDMX
IAC099-123-125-157-272130-
/O.NEW.KDMX.SV.W.0021.240427T2044Z-240427T2130Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
344 PM CDT Sat Apr 27 2024

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Southwestern Poweshiek County in central Iowa...
  Northeastern Marion County in south central Iowa...
  Northwestern Mahaska County in south central Iowa...
  Southeastern Jasper County in central Iowa...

* Until 430 PM CDT.

* At 344 PM CDT, a severe thunderstorm was located 6 miles north of
  Pella Municipal Airport, or 6 miles north of Pella, moving
  northeast at 25 mph.

  HAZARD...60 mph wind gusts and half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* Locations impacted include...
  Pella, Grinnell, New Sharon, Sully, Lynnville, Reasnor, Searsboro,
  Pella Municipal Airport, and Grinnell Regional Airport.

This includes Interstate 80 between mile markers 179 and 185.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

A Tornado Watch remains in effect until 900 PM CDT for south central
Iowa.

&&

LAT...LON 4138 9295 4154 9308 4174 9271 4144 9252
TIME...MOT...LOC 2044Z 237DEG 20KT 4149 9296 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Dodson
2 follow-up statements
594 
WWUS53 KDMX 272101
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
401 PM CDT Sat Apr 27 2024

IAC099-123-125-157-272130-
/O.CON.KDMX.SV.W.0021.000000T0000Z-240427T2130Z/
Poweshiek IA-Marion IA-Mahaska IA-Jasper IA-
401 PM CDT Sat Apr 27 2024

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR SOUTHWESTERN POWESHIEK...NORTHEASTERN MARION...NORTHWESTERN
MAHASKA AND SOUTHEASTERN JASPER COUNTIES...

At 400 PM CDT, a severe thunderstorm was located near Sully, or 8
miles northeast of Pella, moving northeast at 25 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Public reported quarter sized hail 6 miles north of Pella.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
New Sharon, Sully, Lynnville, and Searsboro.

This includes Interstate 80 between mile markers 183 and 185.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for south central
Iowa.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4144 9285 4156 9292 4171 9269 4145 9252
      4144 9252
TIME...MOT...LOC 2100Z 244DEG 24KT 4151 9283 

HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Dodson
431 
WWUS53 KDMX 272120
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
420 PM CDT Sat Apr 27 2024

IAC125-272130-
/O.CAN.KDMX.SV.W.0021.000000T0000Z-240427T2130Z/
Marion IA-
420 PM CDT Sat Apr 27 2024

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MARION COUNTY IS
CANCELLED...

The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 900 PM CDT for south central
Iowa.

LAT...LON 4147 9274 4160 9276 4160 9277 4166 9277
      4171 9269 4147 9253
TIME...MOT...LOC 2120Z 237DEG 20KT 4157 9271 

$$

IAC099-123-157-272130-
/O.CON.KDMX.SV.W.0021.000000T0000Z-240427T2130Z/
Poweshiek IA-Mahaska IA-Jasper IA-
420 PM CDT Sat Apr 27 2024

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 430 PM CDT
FOR SOUTHWESTERN POWESHIEK...NORTH CENTRAL MAHASKA AND EAST CENTRAL
JASPER COUNTIES...

At 420 PM CDT, a severe thunderstorm was located over Searsboro, or 9
miles west of Montezuma, moving northeast at 25 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

Locations impacted include...
New Sharon and Searsboro.

This includes Interstate 80 between mile markers 183 and 185.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for south central
Iowa.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4147 9274 4160 9276 4160 9277 4166 9277
      4171 9269 4147 9253
TIME...MOT...LOC 2120Z 237DEG 20KT 4157 9271 

HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Dodson

The office that day

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

IssuedProductOfficeCountiesLasted
Apr 26, 7:13 PM CDTSevere Thunderstorm WarningDMXAdair, Cass47 min
Apr 26, 7:13 PM CDTSevere Thunderstorm WarningDMXAdair, Cass47 min
Apr 26, 7:16 PM CDTTornado WarningDMXAdair, Madison, Union44 min
Apr 26, 7:21 PM CDTTornado WarningDMXRinggold39 min
Apr 26, 7:25 PM CDTSevere Thunderstorm WarningDMXAudubon, Calhoun, Carroll, Crawford, Greene, Pocahontas and 2 more50 min
Apr 26, 7:29 PM CDTSevere Thunderstorm WarningDMXAdams, Ringgold, Taylor, Union46 min
Apr 26, 7:43 PM CDTTornado Warning Tornado observedDMXAdair, Clarke, Madison, Union47 min
Apr 26, 7:56 PM CDTTornado WarningDMXMadison, Warren49 min
Apr 26, 7:58 PM CDTTornado WarningDMXClarke, Decatur, Ringgold, Union47 min
Apr 26, 8:10 PM CDTTornado WarningDMXClarke, Madison, Union35 min
Apr 26, 8:20 PM CDTTornado WarningDMXDallas, Madison, Polk, Warren25 min
Apr 26, 8:38 PM CDTTornado WarningDMXClarke, Ringgold, Union29 min
Apr 26, 8:40 PM CDTTornado WarningDMXClarke, Lucas, Marion, Warren50 min
Apr 26, 8:49 PM CDTTornado WarningDMXJasper, Marion, Polk, Warren41 min
Apr 26, 9:09 PM CDTSevere Thunderstorm WarningDMXCalhoun, Humboldt, Webster17 min
Apr 26, 9:14 PM CDTTornado WarningDMXJasper, Marion, Warren46 min
Apr 26, 9:47 PM CDTTornado WarningDMXJasper28 min
Apr 26, 10:00 PM CDTSpecial Weather StatementDMXDallas45 min
Apr 26, 11:02 PM CDTTornado WarningDMXPolk21 min
Apr 27, 1:17 PM CDTFlood WatchDMXAdams, Appanoose, Cass, Clarke, Davis, Decatur and 7 more12 hr
Apr 27, 2:40 PM CDTSevere Thunderstorm WarningDMXClarke, Ringgold, Union50 min
Apr 27, 4:13 PM CDTSevere Thunderstorm WarningDMXClarke, Lucas, Madison, Warren20 min
Apr 27, 4:24 PM CDTSevere Thunderstorm WarningDMXMahaska, Poweshiek51 min
Apr 27, 5:53 PM CDTSevere Thunderstorm WarningDMXAppanoose, Davis, Lucas, Mahaska, Marion, Monroe and 2 more52 min
Apr 27, 6:26 PM CDTSevere Thunderstorm WarningDMXDavis, Mahaska, Poweshiek, Wapello49 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.