Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 59, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jul 9, 2021, 1:01 PM CDT for 5 counties in Iowa. It was in force for 44 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
- Jul 9, 2021, 1:01 PM CDT (18:01 UTC)
- Expired
- Jul 9, 2021, 1:45 PM CDT
- In force
- 44 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, Greene County, IA, Polk County, IA, Story County, IA
The radar
The Des Moines radar (KDMX), 34 km from the middle of the area, began a volume at 18:04 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, 1:02 PM CDT | HAIL 1.75 | Ogden, IA | CORRECTS PREVIOUS HAIL REPORT FROM OGDEN. |
| Jul 9, 1:05 PM CDT | HAIL 1.75 | Ogden, IA | LASTED ABOUT 2 MIN. |
| Jul 9, 1:14 PM CDT | HAIL 1.75 | 4 E Berkley, IA | |
| Jul 9, 1:15 PM CDT | HAIL 0.88 | 2 N Boone, IA | |
| Jul 9, 1:21 PM CDT | HAIL 1.75 | 3 Sse Berkley, IA | |
| Jul 9, 1:23 PM CDT | HAIL 1 | 3 W Luther, IA | |
| Jul 9, 1:27 PM CDT | HAIL 1.75 | 2 Nnw Woodward, IA | |
| 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 |
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, 6.0 hours before the alert went out and 207 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.
- 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
The text
As transmitted.
610
WUUS53 KDMX 091801
SVRDMX
IAC015-049-073-153-169-091845-
/O.NEW.KDMX.SV.W.0059.210709T1801Z-210709T1845Z/
BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
101 PM CDT Fri Jul 9 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Northwestern Polk County in central Iowa...
Southeastern Greene County in west central Iowa...
Southwestern Story County in central Iowa...
Boone County in central Iowa...
Northeastern Dallas County in central Iowa...
* Until 145 PM CDT.
* At 100 PM CDT, a severe thunderstorm was located over Ogden, or 10
miles west of Boone, 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 and the storm is intensifying.
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...
Woodward, Madrid, Granger, Saylorville Lake and Big Creek Lake.
This includes Interstate 35 between mile markers 106 and 109.
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.
&&
LAT...LON 4200 9427 4214 9399 4194 9352 4166 9405
TIME...MOT...LOC 1800Z 318DEG 27KT 4201 9406
HAIL...2.50IN
WIND...60MPH
$$
Fowle3 follow-up statements
248
WWUS53 KDMX 091818
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
118 PM CDT Fri Jul 9 2021
IAC015-049-073-153-169-091845-
/O.CON.KDMX.SV.W.0059.000000T0000Z-210709T1845Z/
Polk IA-Greene IA-Story IA-Boone IA-Dallas IA-
118 PM CDT Fri Jul 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 PM CDT
FOR NORTHWESTERN POLK...SOUTHEASTERN GREENE...SOUTHWESTERN STORY...
SOUTHERN BOONE AND NORTHEASTERN DALLAS COUNTIES...
At 116 PM CDT, a severe thunderstorm was located near Woodward, or 9
miles northeast of Perry, moving southeast at 30 mph.
HAZARD...Tennis ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated. This storm has a history of producing golf
ball sized hail and even larger hail is possible.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
Locations impacted include...
Ames, Boone, Perry, Huxley, Madrid, Ogden, Dallas Center, Slater,
Granger, Woodward, Boone Speedway, Big Creek Lake, Saylorville Lake,
Minburn, Sheldahl, Kelley, Rippey, Bouton, Luther and Berkley.
This includes Interstate 35 between mile markers 106 and 109.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to a shelter, inside a strong building and away from windows.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Des Moines .
&&
LAT...LON 4196 9424 4211 9392 4194 9352 4166 9405
TIME...MOT...LOC 1816Z 317DEG 27KT 4192 9395
HAIL...2.50IN
WIND...60MPH
$$
Fowle169
WWUS53 KDMX 091829
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
129 PM CDT Fri Jul 9 2021
IAC015-049-073-153-169-091845-
/O.CON.KDMX.SV.W.0059.000000T0000Z-210709T1845Z/
Polk IA-Greene IA-Story IA-Boone IA-Dallas IA-
129 PM CDT Fri Jul 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 PM CDT
FOR NORTHWESTERN POLK...SOUTHEASTERN GREENE...SOUTHWESTERN STORY...
SOUTHERN BOONE AND NORTHEASTERN DALLAS COUNTIES...
At 128 PM CDT, a severe thunderstorm was located over Madrid, or 12
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.
Locations impacted include...
Perry, Huxley, Madrid, Dallas Center, Slater, Granger, Woodward, Big
Creek Lake, Saylorville Lake, Minburn, Sheldahl, Kelley, Bouton,
Luther, Perry Municipal Airport, Big Creek State Park and Ledges
State Park.
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 4188 9419 4202 9375 4190 9359 4166 9405
TIME...MOT...LOC 1828Z 318DEG 27KT 4185 9386
HAIL...2.50IN
WIND...60MPH
$$
Fowle265
WWUS53 KDMX 091836 CCA
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
136 PM CDT Fri Jul 9 2021
IAC015-049-073-153-169-091845-
/O.COR.KDMX.SV.W.0059.000000T0000Z-210709T1845Z/
Polk IA-Greene IA-Story IA-Boone IA-Dallas IA-
136 PM CDT Fri Jul 9 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 145 PM CDT
FOR NORTHWESTERN POLK...SOUTHEASTERN GREENE...SOUTHWESTERN STORY...
SOUTHERN BOONE AND NORTHEASTERN DALLAS COUNTIES...
At 135 PM CDT, a severe thunderstorm was located near Woodward, or 10
miles north of Grimes, moving southeast at 30 mph.
This is a very dangerous storm.
HAZARD...Baseball size hail and 60 mph wind gusts.
SOURCE...Radar indicated. At 128 pm, baseball sized hail was
reported near Woodward with this storm.
IMPACT...People and animals outdoors will be severely injured.
Expect shattered windows, extensive damage to roofs,
siding, and vehicles.
Locations impacted include...
Perry, Huxley, Madrid, Dallas Center, Slater, Granger, Woodward, Big
Creek Lake, Saylorville Lake, Minburn, Sheldahl, Kelley, Bouton,
Luther, Perry Municipal Airport, Big Creek State Park and Ledges
State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
This is a dangerous storm. Prepare immediately for large destructive
hail capable of producing significant damage. People outside should
move to a shelter, inside a strong building and away from windows.
To report severe weather contact your nearest law enforcement agency.
They will send your report to the National Weather Service office in
Des Moines .
&&
LAT...LON 4188 9419 4202 9375 4190 9359 4166 9405
TIME...MOT...LOC 1829Z 325DEG 25KT 4185 9386
HAIL...2.75IN
WIND...60MPH
$$
FowleThe 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, 1:27 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Madison, Polk, Story | 63 min |
| Jul 9, 2:06 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Madison, Marion, Polk, Warren | 54 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.