Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 48, NWS Des Moines, IA

June 22, 2021Polk County, Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jun 22, 2021, 5:30 PM CDT for Polk County, Iowa. It was in force for 45 min. 11 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, 5:30 PM CDT (22:30 UTC)
Expired: Jun 22, 2021, 6:15 PM CDT
In force: 45 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

County Polk County, IA

The radar

The Des Moines radar (KDMX), 16 km from the middle of the area, began a volume at 22:32 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

Time	Report	Where	Remark
Jun 22, 5:30 PM CDT	HAIL 1	1 Se Grimes, IA	REPORT FROM MPING: QUARTER (1.00 IN.).
Jun 22, 5:30 PM CDT	HAIL 1	1 S Johnston, IA
Jun 22, 5:33 PM CDT	HAIL 1	1 Nnw Grimes, IA	TIME ESTIMATED BY RADAR.
Jun 22, 5:35 PM CDT	HAIL 1	2 W Johnston, IA	REPORT FROM MPING: QUARTER (1.00 IN.).
Jun 22, 5:38 PM CDT	HAIL 1	1 Ssw Johnston, IA	REPORT VIA SOCIAL MEDIA.
Jun 22, 5:39 PM CDT	HAIL 1	1 Wnw Urbandale, IA
Jun 22, 5:42 PM CDT	HAIL 1	2 E Urbandale, IA	REPORT FROM MPING: QUARTER (1.00 IN.).
Jun 22, 5:45 PM CDT	HAIL 1	1 Nw Clive, IA	LOTS OF QUARTER SIZED HAIL.
Jun 22, 5:46 PM CDT	HAIL 1	1 Ssw Windsor Heights, IA
Jun 22, 5:48 PM CDT	HAIL 1.5	2 E Johnston, IA	REPORT FROM MPING: PING PONG BALL (1.50 IN.).
Jun 22, 5:49 PM CDT	HAIL 0.75	1 Ne West Des Moines, IA	REPORT FROM MPING: DIME (0.75 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, 10.5 hours before the alert went out and 223 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-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

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.

600 
WUUS53 KDMX 222230
SVRDMX
IAC153-222315-
/O.NEW.KDMX.SV.W.0048.210622T2230Z-210622T2315Z/

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

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Southwestern Polk County in central Iowa...

* Until 615 PM CDT.

* At 530 PM CDT, a severe thunderstorm was located over Urbandale,
  moving southeast at 25 mph.

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

  SOURCE...Radar indicated. Trained spotters have already reported 
           at least quarter size hail with this storm.

  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 be near...
  Valley West Mall around 535 PM CDT.
  Windsor Heights, Saylorville and Merle Hay Mall around 540 PM CDT.
  Drake Stadium And Knapp Center around 545 PM CDT.
  Des Moines, Ankeny, Iowa Events Center, Principal Park and Des 
  Moines Int'l Airport around 550 PM CDT.

Other locations in the path of this severe thunderstorm include
Norwalk, Southridge Mall, Iowa State Fairgrounds, Pleasant Hill and
Carlisle.

This includes the following highways...
 Interstate 35 between mile markers 70 and 72, and between mile
markers 87 and 88.
 Interstate 80 between mile markers 122 and 139.
 Interstate 235 between mile markers 1 and 14.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4151 9373 4156 9379 4160 9379 4160 9381
      4167 9381 4173 9379 4162 9344 4151 9353
TIME...MOT...LOC 2230Z 298DEG 21KT 4164 9377 

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

Krull

2 follow-up statements

008 
WWUS53 KDMX 222246
SVSDMX

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

IAC153-222315-
/O.CON.KDMX.SV.W.0048.000000T0000Z-210622T2315Z/
Polk IA-
546 PM CDT Tue Jun 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR SOUTHWESTERN POLK COUNTY...

At 546 PM CDT, a severe thunderstorm was located over Iowa Events
Center, or over Des Moines, moving southeast at 25 mph.

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

SOURCE...Radar indicated. Multiple reports of quarter size hail have 
         come in from trained spotters.

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

This severe storm will be near...
  Des Moines around 550 PM CDT.

Other locations in the path of this severe thunderstorm include
Southridge Mall, Iowa State Fairgrounds, Pleasant Hill and Carlisle.

This includes the following highways...
 Interstate 35 between mile markers 70 and 72.
 Interstate 80 between mile markers 122 and 137.
 Interstate 235 between mile markers 1 and 14.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4151 9373 4156 9379 4160 9379 4160 9381
      4167 9381 4171 9378 4161 9345 4151 9353
TIME...MOT...LOC 2246Z 297DEG 22KT 4158 9364 

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

Krull

628 
WWUS53 KDMX 222301
SVSDMX

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

IAC153-222315-
/O.CON.KDMX.SV.W.0048.000000T0000Z-210622T2315Z/
Polk IA-
601 PM CDT Tue Jun 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 615 PM CDT
FOR SOUTH CENTRAL POLK COUNTY...

At 601 PM CDT, a severe thunderstorm was located over Carlisle, or
near Pleasant Hill, moving southeast at 25 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 storm will be near...
  Carlisle around 605 PM CDT.

This includes the following highways...
 Interstate 80 near mile marker 134.
 Interstate 235 between mile markers 5 and 12.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4151 9373 4153 9370 4158 9369 4165 9365
      4163 9360 4160 9346 4151 9353
TIME...MOT...LOC 2301Z 298DEG 21KT 4154 9353 

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

Krull

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 22, 4:59 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Polk	46 min
Jun 22, 5:22 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun, Sac	38 min
Jun 22, 5:50 PM CDT	Severe Thunderstorm Warning	DMX	Calhoun	40 min
Jun 22, 5:52 PM CDT	Special Weather Statement	DMX	Poweshiek	23 min
Jun 22, 5:58 PM CDT	Severe Thunderstorm Warning	DMX	Polk, Warren	47 min
Jun 22, 6:09 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Calhoun, Carroll, Greene, Webster	51 min
Jun 22, 6:30 PM CDT	Severe Thunderstorm Warning	DMX	Lucas, Marion, Warren	45 min
Jun 22, 6:33 PM CDT	Severe Thunderstorm Warning	DMX	Carroll, Greene	42 min
Jun 22, 6:42 PM CDT	Special Weather Statement	DMX	Tama	63 min
Jun 22, 6:49 PM CDT	Severe Thunderstorm Warning	DMX	Dallas, Guthrie	41 min

Nearby

Severe Thunderstorm Warnings in Iowa, 2021 Every 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.