Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 50, NWS Des Moines, IA

June 22, 2021Polk County, Warren County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 22, 2021, 5:58 PM CDT for Polk County, Warren County, Iowa. It was in force for 47 min. 9 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 22, 2021, 5:58 PM CDT (22:58 UTC)
Expired
Jun 22, 2021, 6:45 PM CDT
In force
47 min
Issued by
NWS Des Moines, IA
Area
Storm-based polygon
Hail
1.0 in
Wind
60.0 mph

Counties Polk County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 48 km from the middle of the area, began a volume at 23:00 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 22, 5:58 PM CDTHAIL 11 S Norwalk, IAREPORT FROM MPING: QUARTER (1.00 IN.).
Jun 22, 6:00 PM CDTHAIL 0.88Norwalk, IAREPORT VIA SOCIAL MEDIA. TIME ESTIMATED BY RADAR.
Jun 22, 6:05 PM CDTHAIL 15 Ene Spring Hill, IAROAD IS COMPLETELY COVERED WITH DIME TO QUARTER SIZE HAIL ALONG G24 HIGHWAY NEAR HIGHWAY 65/69 INTERSECTION NORTH OF INDIANOLA. TIME ESTIMATED BY RADAR.
Jun 22, 6:21 PM CDTHAIL 0.751 Ne Indianola, IAREPORT FROM MPING: DIME (0.75 IN.).
Jun 22, 6:22 PM CDTHAIL 1.5Indianola, IAQUARTER TO PING PONG BALL SIZED HAIL IN INDIANOLA.
Jun 22, 6:25 PM CDTHAIL 1.51 Wsw Ackworth, IA1.5 INCH HAIL STILL ALONG HIGHWAY 92 EAST OF INDIANOLA. OCCURRENCE TIME ESTIMATED BY RADAR.
Jun 22, 6:30 PM CDTHAIL 0.75Milo, IAREPORT FROM MPING: DIME (0.75 IN.).
Jun 22, 6:30 PM CDTHAIL 13 Ese Indianola, IAREPORT FROM MPING: QUARTER (1.00 IN.).
Jun 22, 6:31 PM CDTHAIL 1.53 Ese Indianola, IAREPORT FROM MPING: PING PONG BALL (1.50 IN.).

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

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.0 hours before the alert went out and 236 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 2021-06-22Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 1 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 2021-06-22The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 259 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
1 J/kg
Mixed-layer CIN
No buoyant parcel
Mixed-layer LCL
1910 m above ground
0-6 km bulk shear
59 kt
0-1 km storm-relative helicity
259 m²/s²
0-3 km storm-relative helicity
324 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.0

Open this sounding in Storm Lab

The text

As transmitted.

544 
WUUS53 KDMX 222258
SVRDMX
IAC153-181-222345-
/O.NEW.KDMX.SV.W.0050.210622T2258Z-210622T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
558 PM CDT Tue Jun 22 2021

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  South central Polk County in central Iowa...
  Warren County in south central Iowa...

* Until 645 PM CDT.

* At 558 PM CDT, a severe thunderstorm was located over Norwalk,
  moving southeast at 35 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

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

* This severe thunderstorm will be near...
  Indianola around 610 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4116 9361 4151 9375 4155 9361 4140 9333
      4128 9333 4116 9358
TIME...MOT...LOC 2258Z 321DEG 30KT 4147 9366 

HAIL...1.00IN
WIND...60MPH
 
$$

Krull
3 follow-up statements
421 
WWUS53 KDMX 222311
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
611 PM CDT Tue Jun 22 2021

IAC153-181-222345-
/O.CON.KDMX.SV.W.0050.000000T0000Z-210622T2345Z/
Polk IA-Warren IA-
611 PM CDT Tue Jun 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR SOUTH CENTRAL POLK AND CENTRAL WARREN COUNTIES...

At 611 PM CDT, a severe thunderstorm was located near Indianola,
moving southeast at 35 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated. The public has reported quarter size hail 
         south of Norwalk.

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

This severe storm will be near...
  Indianola around 615 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4122 9360 4147 9366 4154 9359 4140 9333
      4128 9333 4117 9357
TIME...MOT...LOC 2311Z 320DEG 29KT 4141 9360 

HAIL...1.00IN
WIND...60MPH
 
$$

Krull
251 
WWUS53 KDMX 222323
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
623 PM CDT Tue Jun 22 2021

IAC153-222332-
/O.CAN.KDMX.SV.W.0050.000000T0000Z-210622T2345Z/
Polk IA-
623 PM CDT Tue Jun 22 2021

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

LAT...LON 4123 9359 4147 9360 4151 9354 4140 9333
      4128 9333 4117 9357
TIME...MOT...LOC 2322Z 336DEG 40KT 4130 9353 

$$

IAC181-222345-
/O.CON.KDMX.SV.W.0050.000000T0000Z-210622T2345Z/
Warren IA-
623 PM CDT Tue Jun 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR EASTERN WARREN COUNTY...

At 622 PM CDT, a severe thunderstorm was located near Indianola,
moving southeast at 45 mph.

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

SOURCE...At 620 PM, emergency management reported ping pong ball 
         size hail in Indianola. 

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
eastern Warren County, including the following locations... Otter
Creek County Park, Ackworth, Milo, Lake Ahquabi State Park and
Sandyville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4123 9359 4147 9360 4151 9354 4140 9333
      4128 9333 4117 9357
TIME...MOT...LOC 2322Z 336DEG 40KT 4130 9353 

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

Krull
398 
WWUS53 KDMX 222336
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
636 PM CDT Tue Jun 22 2021

IAC181-222345-
/O.CON.KDMX.SV.W.0050.000000T0000Z-210622T2345Z/
Warren IA-
636 PM CDT Tue Jun 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR SOUTHEASTERN WARREN COUNTY...

At 635 PM CDT, a severe thunderstorm was located 9 miles southeast of
Indianola, moving southeast at 30 mph.

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

SOURCE...Emergency management.

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...
Milo, Ackworth, Sandyville, Otter Creek County Park and Lake Ahquabi
State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4132 9359 4141 9336 4128 9333 4117 9357
      4123 9359
TIME...MOT...LOC 2335Z 320DEG 28KT 4125 9346 

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

Krull

The office that day

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

IssuedProductOfficeCountiesLasted
Jun 22, 4:59 PM CDTSevere Thunderstorm WarningDMXDallas, Polk46 min
Jun 22, 5:22 PM CDTSevere Thunderstorm WarningDMXCalhoun, Sac38 min
Jun 22, 5:30 PM CDTSevere Thunderstorm WarningDMXPolk45 min
Jun 22, 5:50 PM CDTSevere Thunderstorm WarningDMXCalhoun40 min
Jun 22, 5:52 PM CDTSpecial Weather StatementDMXPoweshiek23 min
Jun 22, 6:09 PM CDTSevere Thunderstorm WarningDMXBoone, Calhoun, Carroll, Greene, Webster51 min
Jun 22, 6:30 PM CDTSevere Thunderstorm WarningDMXLucas, Marion, Warren45 min
Jun 22, 6:33 PM CDTSevere Thunderstorm WarningDMXCarroll, Greene42 min
Jun 22, 6:42 PM CDTSpecial Weather StatementDMXTama63 min
Jun 22, 6:49 PM CDTSevere Thunderstorm WarningDMXDallas, Guthrie41 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.