Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 61, NWS Des Moines, IA

July 9, 20215 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 9, 2021, 2:06 PM CDT for 5 counties in Iowa. It was in force for 54 min. 6 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: Jul 9, 2021, 2:06 PM CDT (19:06 UTC)
Expired: Jul 9, 2021, 3:00 PM CDT
In force: 54 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Tornado: Possible
Hail: 2.75 in
Wind: 60.0 mph

Counties Jasper County, IA, Madison County, IA, Marion County, IA, Polk County, IA, Warren County, IA

The radar

The Des Moines radar (KDMX), 33 km from the middle of the area, began a volume at 19:10 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
Jul 9, 2:16 PM CDT	HAIL 1.25	1 Ne Des Moines, IA	AT THE STATE CAPITOL.
Jul 9, 2:21 PM CDT	HAIL 1.75	1 Ne Des Moines, IA	INCREASED HAIL SIZE AT THE STATE CAPITOL.
Jul 9, 2:21 PM CDT	HAIL 1.75	1 Ne Des Moines, IA	CORRECTS PREVIOUS HAIL REPORT FROM 1 NE DES MOINES TO CORRECT SOURCE. INCREASED HAIL SIZE AT THE STATE CAPITOL.
Jul 9, 2:23 PM CDT	HAIL 1.75	1 E Des Moines Int Airp, IA	ONGOING AT TIME OF REPORT.
Jul 9, 2:36 PM CDT	HAIL 1	Carlisle, IA	HAIL ONGOING AT TIME OF REPORT.
Jul 9, 2:49 PM CDT	HAIL 1.5	2 E Indianola, IA	AT PICKARD PARK EAST OF INDIANOLA.

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, 7.1 hours before the alert went out and 225 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: 428 J/kg
Mixed-layer CIN: -350 J/kg
Mixed-layer LCL: 881 m above ground
0-6 km bulk shear: 63 kt
0-1 km storm-relative helicity: 404 m²/s²
0-3 km storm-relative helicity: 551 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.9

Open this sounding in Storm Lab

The text

As transmitted.

271 
WUUS53 KDMX 091906
SVRDMX
IAC099-121-125-153-181-092000-
/O.NEW.KDMX.SV.W.0061.210709T1906Z-210709T2000Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
206 PM CDT Fri Jul 9 2021

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Southern Polk County in central Iowa...
  Northeastern Madison County in south central Iowa...
  Northwestern Marion County in south central Iowa...
  Southwestern Jasper County in central Iowa...
  Warren County in south central Iowa...

* Until 300 PM CDT.

* At 204 PM CDT, a severe thunderstorm was located over Windsor
  Heights, or near Urbandale, moving southeast at 30 mph.

  This is a very dangerous storm.

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

  SOURCE...Trained weather spotters. This storm has a history of 
           producing hail up to 3 inches in diameter.  This is a 
           very dangerous situation. 

  IMPACT...People and animals outdoors will be severely injured. 
           Expect shattered windows, extensive damage to roofs, 
           siding, and vehicles.

* This severe thunderstorm will be near...
  Des Moines around 210 PM CDT.
  Principal Park around 215 PM CDT.
  Norwalk, Des Moines Int'l Airport and Iowa State Fairgrounds 
  around 220 PM CDT.

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

This includes the following highways...
 Interstate 35 between mile markers 45 and 68.
 Interstate 235 between mile markers 10 and 11.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly 
from severe thunderstorms. If you spot a tornado go at once into the 
basement or small central room in a sturdy structure.

This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to shelter inside a strong building,  and stay away from
windows.

To report severe weather, contact your nearest law enforcement
agency. They will send your report to the National Weather Service
office in Des Moines .

&&

LAT...LON 4118 9380 4148 9391 4151 9383 4151 9380
      4152 9379 4167 9339 4147 9308
TIME...MOT...LOC 1904Z 326DEG 25KT 4162 9372 

TORNADO...POSSIBLE
HAIL...2.75IN
WIND...60MPH
 
$$

Fowle

4 follow-up statements

674 
WWUS53 KDMX 091927
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
227 PM CDT Fri Jul 9 2021

IAC121-091936-
/O.CAN.KDMX.SV.W.0061.000000T0000Z-210709T2000Z/
Madison IA-
227 PM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN MADISON 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 4122 9371 4146 9375 4153 9377 4167 9339
      4147 9308
TIME...MOT...LOC 1926Z 326DEG 25KT 4149 9360 

$$

IAC099-125-153-181-092000-
/O.CON.KDMX.SV.W.0061.000000T0000Z-210709T2000Z/
Polk IA-Marion IA-Jasper IA-Warren IA-
227 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR SOUTHERN POLK...NORTHWESTERN MARION...SOUTHWESTERN JASPER AND
NORTHWESTERN WARREN COUNTIES...

At 226 PM CDT, a severe thunderstorm was located over Southridge
Mall, or near Norwalk, moving southeast at 30 mph.

HAZARD...Two inch hail and 60 mph wind gusts.

SOURCE...Trained weather spotters. This storm has a history of 
         golfball to 3 inch hail.  

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...
  Carlisle and Indianola.

This includes Interstate 235 between mile markers 10 and 11.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to a shelter, inside a strong building and away from windows.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Des Moines .

&&

LAT...LON 4122 9371 4146 9375 4153 9377 4167 9339
      4147 9308
TIME...MOT...LOC 1926Z 326DEG 25KT 4149 9360 

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

Fowle

937 
WWUS53 KDMX 091938
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
238 PM CDT Fri Jul 9 2021

IAC099-125-153-181-092000-
/O.CON.KDMX.SV.W.0061.000000T0000Z-210709T2000Z/
Polk IA-Marion IA-Jasper IA-Warren IA-
238 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR SOUTHEASTERN POLK...NORTHWESTERN MARION...SOUTHWESTERN JASPER AND
NORTHEASTERN WARREN COUNTIES...

At 237 PM CDT, a severe thunderstorm was located near Indianola,
moving southeast at 30 mph.

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

SOURCE...Trained weather spotters. Quarter sized hail was recently 
         reported in Carlisle, and larger hail to ping pong ball is 
         still possible. 

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...
Des Moines, Indianola, Norwalk, Pleasant Hill, Carlisle,
Pleasantville, Southridge Mall, Des Moines Int'l Airport, Hartford,
Runnells, Ackworth, Swan, Spring Hill, Sandyville and Lake Ahquabi
State Park.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Des Moines .

&&

LAT...LON 4125 9363 4145 9368 4153 9368 4161 9348
      4144 9316
TIME...MOT...LOC 1937Z 326DEG 25KT 4142 9354 

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

Fowle

590 
WWUS53 KDMX 091952
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
252 PM CDT Fri Jul 9 2021

IAC099-092001-
/O.CAN.KDMX.SV.W.0061.000000T0000Z-210709T2000Z/
Jasper IA-
252 PM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN JASPER 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 4127 9358 4146 9360 4154 9343 4142 9321
      4134 9340
TIME...MOT...LOC 1951Z 322DEG 21KT 4136 9347 

$$

IAC125-153-181-092000-
/O.CON.KDMX.SV.W.0061.000000T0000Z-210709T2000Z/
Polk IA-Marion IA-Warren IA-
252 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR SOUTHEASTERN POLK...WEST CENTRAL MARION AND NORTHEASTERN WARREN
COUNTIES...

At 251 PM CDT, a severe thunderstorm was located near Indianola,
moving southeast at 25 mph.

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

SOURCE...Trained weather spotters. At 249pm, ping pong ball sized 
         hail was reported east 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.

Locations impacted include...
Indianola, Carlisle, Pleasantville, Hartford, Ackworth, Swan and
Sandyville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Des Moines .

&&

LAT...LON 4127 9358 4146 9360 4154 9343 4142 9321
      4134 9340
TIME...MOT...LOC 1951Z 322DEG 21KT 4136 9347 

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

Fowle

936 
WWUS53 KDMX 092001
SVSDMX

Severe Weather Statement
National Weather Service Des Moines IA
301 PM CDT Fri Jul 9 2021

IAC125-153-181-092010-
/O.EXP.KDMX.SV.W.0061.000000T0000Z-210709T2000Z/
Polk IA-Marion IA-Warren IA-
301 PM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN POLK...WEST
CENTRAL MARION AND NORTHEASTERN WARREN COUNTIES HAS EXPIRED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been allowed to expire.  However heavy rain is still possible with
this thunderstorm.

LAT...LON 4127 9358 4146 9360 4154 9343 4142 9321
      4134 9340
TIME...MOT...LOC 2000Z 326DEG 25KT 4132 9343 

$$

Fowle

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 9, 2:59 AM CDT	Flood Watch	DMX	Appanoose, Davis, Monroe, Wapello, Wayne	13 min
Jul 9, 3:12 AM CDT	Flash Flood Watch	DMX	Appanoose, Clarke, Davis, Decatur, Lucas, Madison and 4 more	30 hr
Jul 9, 8:09 AM CDT	Severe Thunderstorm Warning	DMX	Adair, Adams, Union	28 min
Jul 9, 9:24 AM CDT	Special Weather Statement	DMX	Wayne	21 min
Jul 9, 12:04 PM CDT	Special Weather Statement	DMX	Webster	26 min
Jul 9, 12:28 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Greene, Hamilton, Webster	47 min
Jul 9, 1:01 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Greene, Polk, Story	44 min
Jul 9, 1:27 PM CDT	Severe Thunderstorm Warning	DMX	Boone, Dallas, Madison, Polk, Story	63 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.