Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 13, NWS Des Moines, IA

June 18, 20215 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 18, 2021, 10:43 PM CDT for 5 counties in Iowa. It was in force for 47 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
Jun 18, 2021, 10:43 PM CDT (03:43 UTC)
Expired
Jun 18, 2021, 11:30 PM CDT
In force
47 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.25 in
Wind
60.0 mph

Counties Clarke County, IA, Lucas County, IA, Madison County, IA, Union County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 74 km from the middle of the area, began a volume at 03:46 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
Jun 18, 11:10 PM CDTHAIL 12 Nne Osceola, IA
Jun 18, 11:30 PM CDTHAIL 1.75Woodburn, IAREPORT VIA SOCIAL MEDIA.

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
Jun 18, 10:08 PM CDTSevere Thunderstorm WatchSPC8 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 3.7 hours before the alert went out and 216 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 00:00Z on 2021-06-19Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2090 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 00:00Z on 2021-06-19The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 46 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
2090 J/kg
Mixed-layer CIN
-169 J/kg
Mixed-layer LCL
1569 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
46 m²/s²
0-3 km storm-relative helicity
307 m²/s²
Significant tornado parameter
-0.0
Supercell composite
-0.3

Open this sounding in Storm Lab

The text

As transmitted.

011 
WUUS53 KDMX 190343
SVRDMX
IAC039-117-121-175-181-190430-
/O.NEW.KDMX.SV.W.0013.210619T0343Z-210619T0430Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
1043 PM CDT Fri Jun 18 2021

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Western Lucas County in south central Iowa...
  Southeastern Madison County in south central Iowa...
  Northeastern Union County in south central Iowa...
  Clarke County in south central Iowa...
  Southern Warren County in south central Iowa...

* Until 1130 PM CDT.

* At 1043 PM CDT, a severe thunderstorm was located 14 miles south 
  of Winterset, moving east at 30 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...
  Osceola and Lakeside Casino.

This includes Interstate 35 between mile markers 30 and 48.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4107 9414 4125 9407 4125 9341 4090 9355
      4090 9357
TIME...MOT...LOC 0343Z 280DEG 26KT 4114 9402 

HAIL...1.25IN
WIND...60MPH
 
$$

Martin
1 follow-up statement
365 
WWUS53 KDMX 190402
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1102 PM CDT Fri Jun 18 2021

IAC175-190411-
/O.CAN.KDMX.SV.W.0013.000000T0000Z-210619T0430Z/
Union IA-
1102 PM CDT Fri Jun 18 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN UNION COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 500 AM CDT for
south central Iowa.

LAT...LON 4102 9398 4125 9379 4125 9341 4090 9355
      4090 9357
TIME...MOT...LOC 0401Z 280DEG 26KT 4112 9384 

$$

IAC039-117-121-181-190430-
/O.CON.KDMX.SV.W.0013.000000T0000Z-210619T0430Z/
Lucas IA-Madison IA-Clarke IA-Warren IA-
1102 PM CDT Fri Jun 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT
FOR WESTERN LUCAS...SOUTHEASTERN MADISON...CLARKE AND SOUTHERN WARREN
COUNTIES...

At 1101 PM CDT, a severe thunderstorm was located near Osceola, 
moving east at 30 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...
Osceola, Lakeside Casino, Murray, New Virginia, Woodburn, Otter Creek
County Park and Murray Roadside Rest Area.

This includes Interstate 35 between mile markers 30 and 48.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4102 9398 4125 9379 4125 9341 4090 9355
      4090 9357
TIME...MOT...LOC 0401Z 280DEG 26KT 4112 9384 

HAIL...1.25IN
WIND...60MPH
 
$$

Martin

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 18, 9:56 PM CDTSevere Thunderstorm WarningDMXClarke, Lucas, Madison, Marion, Warren49 min
Jun 18, 10:06 PM CDTSevere Thunderstorm WarningDMXAdair, Clarke, Madison, Union39 min
Jun 18, 10:39 PM CDTSevere Thunderstorm WarningDMXLucas, Monroe, Wayne51 min
Jun 18, 10:45 PM CDTSevere Thunderstorm WarningDMXMahaska, Marion, Monroe, Wapello45 min
Jun 18, 10:54 PM CDTSevere Thunderstorm WarningDMXAdair, Cass51 min
Jun 18, 11:05 PM CDTSevere Thunderstorm WarningDMXMahaska, Marion25 min
Jun 18, 11:10 PM CDTSevere Thunderstorm WarningDMXAppanoose, Lucas, Monroe, Wayne50 min
Jun 18, 11:14 PM CDTSevere Thunderstorm WarningDMXAdair, Madison46 min
Jun 18, 11:19 PM CDTSevere Thunderstorm WarningDMXMahaska26 min
Jun 18, 11:22 PM CDTSevere Thunderstorm WarningDMXAppanoose, Davis, Monroe, Wapello53 min
Jun 18, 11:25 PM CDTSevere Thunderstorm WarningDMXClarke, Decatur, Lucas, Wayne50 min
Jun 18, 11:32 PM CDTSevere Thunderstorm WarningDMXCass28 min
Jun 18, 11:37 PM CDTSevere Thunderstorm WarningDMXAdair, Adams, Union53 min
Jun 18, 11:54 PM CDTSevere Thunderstorm WarningDMXClarke, Madison, Warren36 min
Jun 18, 11:55 PM CDTSevere Thunderstorm WarningDMXAppanoose, Lucas, Monroe, Wayne50 min
Jun 18, 11:59 PM CDTSevere Thunderstorm WarningDMXAdair, Adams, Clarke, Madison, Ringgold, Union46 min
Jun 19, 12:13 AM CDTSevere Thunderstorm WarningDMXAdams26 min
Jun 19, 12:14 AM CDTSevere Thunderstorm WarningDMXDavis, Wapello31 min
Jun 19, 12:25 AM CDTSevere Thunderstorm WarningDMXClarke, Lucas, Marion, Warren35 min
Jun 19, 12:29 AM CDTSevere Thunderstorm WarningDMXAppanoose, Davis46 min
Jun 19, 12:44 AM CDTSevere Thunderstorm WarningDMXLucas, Marion, Monroe31 min
Jun 19, 3:59 AM CDTSpecial Weather StatementDMXDavis46 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2021Every severe thunderstorm warning in 2021

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.