Alert archive / Iowa / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 60, NWS Des Moines, IA

July 9, 20215 counties in Iowa

NWS Des Moines, IA issued this severe thunderstorm warning at Jul 9, 2021, 1:27 PM CDT for 5 counties in Iowa. It was in force for 63 min. 29 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, 1:27 PM CDT (18:27 UTC)
Expired: Jul 9, 2021, 2:30 PM CDT
In force: 63 min
Issued by: NWS Des Moines, IA
Area: Storm-based polygon
Hail: 2.5 in
Wind: 60.0 mph

Counties Boone County, IA, Dallas County, IA, Madison County, IA, Polk County, IA, Story County, IA

The radar

The Des Moines radar (KDMX), 14 km from the middle of the area, began a volume at 18:29 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, 1:28 PM CDT	HAIL 2.75	Woodward, IA
Jul 9, 1:29 PM CDT	HAIL 2.75	1 Nne Woodward, IA	TIME ESTIMATED.
Jul 9, 1:29 PM CDT	HAIL 3	Woodward, IA	REPORT VIA SOCIAL MEDIA.
Jul 9, 1:38 PM CDT	HAIL 1.75	3 S Woodward, IA
Jul 9, 1:55 PM CDT	HAIL 1.75	Grimes, IA	REPORT FROM MPING: GOLF BALL (1.75 IN.).
Jul 9, 1:56 PM CDT	HAIL 1.75	2 Ne Johnston, IA	REPORT FROM MPING: GOLF BALL (1.75 IN.).
Jul 9, 1:58 PM CDT	HAIL 1	1 Ne Johnston, IA	REPORT FROM MPING: QUARTER (1.00 IN.).
Jul 9, 1:59 PM CDT	HAIL 1.75	1 W Johnston, IA
Jul 9, 2:00 PM CDT	HAIL 1.75	1 S Johnston, IA
Jul 9, 2:01 PM CDT	HAIL 1.25	2 E Urbandale, IA	REPORT FROM MPING: HALF DOLLAR (1.25 IN.).
Jul 9, 2:01 PM CDT	HAIL 1.5	1 Ne Johnston, IA	REPORT FROM MPING: PING PONG BALL (1.50 IN.).
Jul 9, 2:01 PM CDT	HAIL 1.5	1 Se Granger, IA	REPORT FROM MPING: PING PONG BALL (1.50 IN.).
Jul 9, 2:01 PM CDT	HAIL 2	2 Ene Urbandale, IA
Jul 9, 2:01 PM CDT	HAIL 2	3 S Polk City, IA	GOLF BALL TO EGG SIZE AT THE NWS OFFICE IN JOHNSTON.
Jul 9, 2:01 PM CDT	HAIL 2.75	1 Se Urbandale, IA	REPORT FROM MPING: BASEBALL (2.75 IN.).
Jul 9, 2:02 PM CDT	HAIL 1	2 Ne Windsor Heights, IA	REPORT FROM MPING: QUARTER (1.00 IN.).
Jul 9, 2:02 PM CDT	HAIL 1	2 Nw Clive, IA	REPORT FROM MPING: QUARTER (1.00 IN.).
Jul 9, 2:03 PM CDT	HAIL 2.75	Johnston, IA	COURTESY WHOTV.
Jul 9, 2:05 PM CDT	HAIL 1.75	1 Nne Windsor Heights, IA
Jul 9, 2:06 PM CDT	HAIL 1.75	1 Se Windsor Heights, IA	LARGEST HAIL WAS GOLF BALL SIZED AROUND 206PM.
Jul 9, 2:08 PM CDT	HAIL 1.75	3 W Ankeny, IA	HALF DOLLAR TO GOLF BALL SIZED HAIL.
Jul 9, 2:11 PM CDT	HAIL 1.75	1 Ese Urbandale, IA
Jul 9, 2:14 PM CDT	HAIL 1.5	3 Ene Windsor Heights, IA	THREE-QUARTERS TO AS LARGE AS PING PONG SIZED HAIL.
Jul 9, 2:15 PM CDT	HAIL 1.5	2 Wnw Des Moines, IA	MOST HAIL WAS BETWEEN DIME AND NICKEL SIZE AT 31ST AND INGERSOLL AVENUE, BUT LARGEST ESTIMATED WAS 1.5 INCHES. HAIL AT TIME OF REPORT.
Jul 9, 2:15 PM CDT	HAIL 3.25	2 Ene Windsor Heights, IA	PICTURE VIA SOCIAL MEDIA OF 3.25 INCH HAIL IN BEAVERDALE. TIME ESTIMATED VIA RADAR.
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, 2:24 PM CDT	HAIL 1	1 Nne Des Moines, IA	AT THE CAPITAL COMPLEX.

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, 6.5 hours before the alert went out and 220 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.

442 
WUUS53 KDMX 091827
SVRDMX
IAC015-049-121-153-169-091930-
/O.NEW.KDMX.SV.W.0060.210709T1827Z-210709T1930Z/

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

The National Weather Service in Des Moines  has issued a

* Severe Thunderstorm Warning for...
  Polk County in central Iowa...
  Southwestern Story County in central Iowa...
  Northeastern Madison County in south central Iowa...
  Southeastern Boone County in central Iowa...
  Eastern Dallas County in central Iowa...

* Until 230 PM CDT.

* At 126 PM CDT, a severe thunderstorm was located over Woodward, or
  9 miles east of Perry, moving southeast at 30 mph.

  HAZARD...Tennis ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated. This storm has a history of producing 
           large hail to golf ball sized hail with larger hail to 
           tennis ball sized 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.

* This severe thunderstorm will be near...
  Madrid around 130 PM CDT.
  Granger, Saylorville Lake and Big Creek Lake around 140 PM CDT.
  Polk City around 145 PM CDT.

Other locations in the path of this severe thunderstorm include
Waukee, Urbandale, Grimes, Saylorville, West Des Moines, Johnston,
Clive, Windsor Heights, Merle Hay Mall, Valley West Mall, Des Moines,
Ankeny and Drake Stadium And Knapp Center.

This includes the following highways...
 Interstate 35 between mile markers 68 and 72, and between mile
markers 87 and 103.
 Interstate 80 between mile markers 109 and 149.
 Interstate 235 between mile markers 1 and 14.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4142 9399 4180 9413 4195 9366 4171 9335
      4167 9335 4151 9375 4151 9379 4150 9379
TIME...MOT...LOC 1826Z 317DEG 26KT 4186 9392 

HAIL...2.50IN
WIND...60MPH
 
$$

Fowle

5 follow-up statements

199 
WWUS53 KDMX 091832
SVSDMX

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

IAC015-049-121-153-169-091930-
/O.CON.KDMX.SV.W.0060.000000T0000Z-210709T1930Z/
Polk IA-Story IA-Madison IA-Boone IA-Dallas IA-
132 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM CDT
FOR POLK...SOUTHWESTERN STORY...NORTHEASTERN MADISON...SOUTHEASTERN
BOONE AND EASTERN DALLAS COUNTIES...

At 131 PM CDT, a severe thunderstorm was located over Woodward, or 11
miles east of Perry, moving southeast at 30 mph.

This is a very dangerous storm.

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

SOURCE...Trained weather spotters. At 128 pm, baseball sized hail 
         was reported near Woodward with this storm. 

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

This severe storm will be near...
  Granger, Saylorville Lake and Big Creek Lake around 140 PM CDT.
  Polk City around 145 PM CDT.

Other locations in the path of this severe thunderstorm include
Urbandale, Grimes, Saylorville, West Des Moines, Johnston, Clive,
Windsor Heights, Merle Hay Mall, Valley West Mall, Des Moines,
Ankeny, Drake Stadium And Knapp Center, Altoona, Bondurant, Iowa
Events Center, Principal Park, Des Moines Int'l Airport, Prairie
Meadows, Adventureland Amusement Park and Iowa State Fairgrounds.

This includes the following highways...
 Interstate 35 between mile markers 68 and 72, and between mile
markers 87 and 103.
 Interstate 80 between mile markers 109 and 149.
 Interstate 235 between mile markers 1 and 14.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4142 9399 4180 9413 4195 9366 4171 9335
      4167 9335 4151 9375 4151 9379 4150 9379
TIME...MOT...LOC 1831Z 317DEG 26KT 4183 9388 

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

Fowle

074 
WWUS53 KDMX 091840
SVSDMX

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

IAC015-049-121-153-169-091930-
/O.CON.KDMX.SV.W.0060.000000T0000Z-210709T1930Z/
Polk IA-Story IA-Madison IA-Boone IA-Dallas IA-
140 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM CDT
FOR POLK...SOUTHWESTERN STORY...NORTHEASTERN MADISON...SOUTHEASTERN
BOONE AND EASTERN DALLAS COUNTIES...

At 138 PM CDT, a severe thunderstorm was located over Granger, or 7
miles northwest of Grimes, moving southeast at 30 mph.

This is a very rare and dangerous storm!!

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

SOURCE...Trained weather spotters reported baseball sized hail. Hail 
         to softball sized is possible. This is a rare and very 
         dangerouns situation.  Take cover now! 

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

This severe storm will be near...
  Polk City and Saylorville Lake around 145 PM CDT.
  Waukee and Grimes around 150 PM CDT.

Other locations in the path of this severe thunderstorm include
Urbandale, Johnston, Saylorville, Des Moines, West Des Moines,
Ankeny, Clive, Windsor Heights, Merle Hay Mall, Valley West Mall,
Jordan Creek Town Center, Drake Stadium And Knapp Center, Iowa Events
Center, Des Moines Int'l Airport, Principal Park, Iowa State
Fairgrounds and Pleasant Hill.

This includes the following highways...
 Interstate 35 between mile markers 68 and 72, and between mile
markers 87 and 103.
 Interstate 80 between mile markers 109 and 149.
 Interstate 235 between mile markers 1 and 14.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4142 9399 4180 9413 4195 9366 4171 9335
      4167 9335 4151 9375 4151 9379 4150 9379
TIME...MOT...LOC 1838Z 323DEG 26KT 4177 9385 

HAIL...4.00IN
WIND...60MPH
 
$$

Fowle

206 
WWUS53 KDMX 091854
SVSDMX

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

IAC015-049-121-153-169-091930-
/O.CON.KDMX.SV.W.0060.000000T0000Z-210709T1930Z/
Polk IA-Story IA-Madison IA-Boone IA-Dallas IA-
154 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM CDT
FOR POLK...SOUTHWESTERN STORY...NORTHEASTERN MADISON...SOUTHEASTERN
BOONE AND SOUTHEASTERN DALLAS COUNTIES...

At 153 PM CDT, a severe thunderstorm was located over Grimes, moving
southeast at 25 mph.

This is a very dangerous storm.

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

SOURCE...Trained weather spotters. Three inch hail was reported with 
         this storm in Woodward. 

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

This severe storm will be near...
  Saylorville around 200 PM CDT.

Other locations in the path of this severe thunderstorm include
Clive, Merle Hay Mall, Valley West Mall, Jordan Creek Town Center,
Des Moines, West Des Moines, Ankeny, Windsor Heights, Drake Stadium
And Knapp Center, Iowa Events Center, Des Moines Int'l Airport,
Principal Park, Iowa State Fairgrounds and Pleasant Hill.

This includes the following highways...
 Interstate 35 between mile markers 68 and 72, and between mile
markers 87 and 97.
 Interstate 80 between mile markers 112 and 148.
 Interstate 235 between mile markers 1 and 14.

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 4143 9396 4172 9402 4187 9370 4170 9341
      4167 9335 4151 9375 4151 9379 4150 9379
TIME...MOT...LOC 1853Z 322DEG 24KT 4169 9378 

TORNADO...POSSIBLE
HAIL...3.00IN
WIND...60MPH
 
$$

Fowle

491 
WWUS53 KDMX 091908
SVSDMX

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

IAC015-169-091917-
/O.CAN.KDMX.SV.W.0060.000000T0000Z-210709T1930Z/
Story IA-Boone IA-
208 PM CDT Fri Jul 9 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN STORY AND
SOUTHEASTERN BOONE COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

LAT...LON 4146 9390 4170 9395 4184 9365 4166 9338
      4151 9375 4151 9379 4150 9379
TIME...MOT...LOC 1907Z 317DEG 26KT 4161 9369 

$$

IAC049-121-153-091930-
/O.CON.KDMX.SV.W.0060.000000T0000Z-210709T1930Z/
Polk IA-Madison IA-Dallas IA-
208 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM CDT
FOR POLK...NORTHEASTERN MADISON AND SOUTHEASTERN DALLAS COUNTIES...

At 207 PM CDT, a severe thunderstorm was located over Merle Hay Mall,
or near Des Moines, 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 storm will be near...
  Des Moines and Drake Stadium And Knapp Center around 210 PM CDT.

Other locations in the path of this severe thunderstorm include
Principal Park, Iowa Events Center, Des Moines Int'l Airport, Iowa
State Fairgrounds and Pleasant Hill.

This includes the following highways...
 Interstate 35 between mile markers 68 and 72, and between mile
markers 87 and 96.
 Interstate 80 between mile markers 116 and 147.
 Interstate 235 between mile markers 1 and 14.

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 4146 9390 4170 9395 4184 9365 4166 9338
      4151 9375 4151 9379 4150 9379
TIME...MOT...LOC 1907Z 317DEG 26KT 4161 9369 

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

Fowle

677 
WWUS53 KDMX 091918
SVSDMX

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

IAC049-121-153-091930-
/O.CON.KDMX.SV.W.0060.000000T0000Z-210709T1930Z/
Polk IA-Madison IA-Dallas IA-
218 PM CDT Fri Jul 9 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 230 PM CDT
FOR CENTRAL POLK...NORTHEASTERN MADISON AND SOUTHEASTERN DALLAS
COUNTIES...

At 217 PM CDT, a severe thunderstorm was located over Des Moines,
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 golfball to 3 inch diameter hail.  

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

This severe storm will be near...
  Pleasant Hill around 225 PM CDT.

This includes the following highways...
 Interstate 35 between mile markers 68 and 72, and between mile
markers 87 and 96.
 Interstate 80 between mile markers 118 and 147.
 Interstate 235 between mile markers 1 and 14.

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 4147 9388 4166 9384 4178 9356 4166 9338
      4151 9375 4151 9379 4150 9379
TIME...MOT...LOC 1917Z 317DEG 26KT 4156 9362 

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

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, 2:06 PM CDT	Severe Thunderstorm Warning	DMX	Jasper, Madison, Marion, Polk, Warren	54 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.