Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 15, NWS Des Moines, IA

June 18, 2021Adair County, Cass County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 18, 2021, 10:54 PM CDT for Adair County, Cass County, Iowa. It was in force for 51 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, 10:54 PM CDT (03:54 UTC)
Expired
Jun 18, 2021, 11:45 PM CDT
In force
51 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.5 in
Wind
60.0 mph

Counties Adair County, IA, Cass County, IA

The radar

The Des Moines radar (KDMX), 104 km from the middle of the area, began a volume at 03:55 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, 11:32 PM CDTHAIL 1.251 Nne Atlantic, IAQUARTER TO HALF DOLLAR SIZED HAIL AT KJAN STUDIOS.
Jun 18, 11:33 PM CDTHAIL 4Bridgewater, IAIRREGULAR SHAPED HAIL; SOME UP TO 4 INCHES IN DIAMETER. DELAYED REPORT.

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, 3.9 hours before the alert went out and 127 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.

195 
WUUS53 KDMX 190354
SVRDMX
IAC001-029-190445-
/O.NEW.KDMX.SV.W.0015.210619T0354Z-210619T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
1054 PM CDT Fri Jun 18 2021

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Southeastern Cass County in southwestern Iowa...
  Western Adair County in southwestern Iowa...

* Until 1145 PM CDT.

* At 1054 PM CDT, a severe thunderstorm was located near Atlantic,
  moving east at 30 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.

* This severe thunderstorm will remain over mainly rural areas of
  southeastern Cass and western Adair Counties, including the
  following locations... Wiota, Bridgewater, Cumberland, Lake Anita
  State Park, Massena and Fontanelle.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4131 9506 4142 9503 4144 9450 4116 9458
TIME...MOT...LOC 0354Z 269DEG 25KT 4136 9494 

HAIL...1.50IN
WIND...60MPH
 
$$

Martin
3 follow-up statements
888 
WWUS53 KDMX 190411
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1111 PM CDT Fri Jun 18 2021

IAC001-029-190445-
/O.CON.KDMX.SV.W.0015.000000T0000Z-210619T0445Z/
Cass IA-Adair IA-
1111 PM CDT Fri Jun 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT
FOR EAST CENTRAL CASS AND WESTERN ADAIR COUNTIES...

At 1111 PM CDT, a severe thunderstorm was located 12 miles east of
Atlantic, moving east at 30 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...
Fontanelle, Massena, Cumberland, Bridgewater, Wiota and Lake Anita
State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4129 9493 4142 9494 4144 9450 4116 9458
TIME...MOT...LOC 0411Z 269DEG 25KT 4136 9478 

HAIL...1.50IN
WIND...60MPH
 
$$

Curtis
918 
WWUS53 KDMX 190427
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1127 PM CDT Fri Jun 18 2021

IAC001-029-190445-
/O.CON.KDMX.SV.W.0015.000000T0000Z-210619T0445Z/
Cass IA-Adair IA-
1127 PM CDT Fri Jun 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT
FOR EAST CENTRAL CASS AND SOUTHWESTERN ADAIR COUNTIES...

At 1127 PM CDT, a severe thunderstorm was located 9 miles northwest
of Greenfield, moving east at 30 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...
Fontanelle, Massena, Cumberland and Bridgewater. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4127 9487 4140 9483 4140 9451 4116 9458
TIME...MOT...LOC 0427Z 269DEG 25KT 4136 9463 

HAIL...1.50IN
WIND...60MPH
 
$$

Curtis
339 
WWUS53 KDMX 190434
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
1134 PM CDT Fri Jun 18 2021

IAC001-029-190445-
/O.CON.KDMX.SV.W.0015.000000T0000Z-210619T0445Z/
Cass IA-Adair IA-
1134 PM CDT Fri Jun 18 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 PM CDT
FOR EAST CENTRAL CASS AND SOUTHWESTERN ADAIR COUNTIES...

At 1134 PM CDT, a severe thunderstorm was located near Greenfield,
moving east at 30 mph.

HAZARD...Two inch 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...
Fontanelle, Massena and Bridgewater. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4125 9482 4138 9477 4137 9452 4116 9458
TIME...MOT...LOC 0434Z 269DEG 25KT 4136 9456 

HAIL...2.00IN
WIND...60MPH
 
$$

Curtis

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, 10:43 PM CDTSevere Thunderstorm WarningDMXClarke, Lucas, Madison, Union, Warren47 min
Jun 18, 10:45 PM CDTSevere Thunderstorm WarningDMXMahaska, Marion, Monroe, Wapello45 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.