Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 110, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 30, 2021, 10:58 PM CDT for 5 counties in Iowa. It was in force for 62 min. 1 report 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
- Aug 30, 2021, 10:58 PM CDT (03:58 UTC)
- Expired
- Aug 31, 2021, 12:00 AM CDT
- In force
- 62 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Audubon County, IA, Carroll County, IA, Crawford County, IA, Greene County, IA, Guthrie County, IA
The radar
The Des Moines radar (KDMX), 106 km from the middle of the area, began a volume at 03:59 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 |
|---|---|---|---|
| Aug 30, 11:04 PM CDT | TSTM WND GST 59 | 7 Wsw Gray, IA | MEASURED BY PERSONAL WEATHER STATION. |
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 00:00Z, 4.0 hours before the alert went out and 137 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
- 1443 J/kg
- Mixed-layer CIN
- -31 J/kg
- Mixed-layer LCL
- 1305 m above ground
- 0-6 km bulk shear
- 35 kt
- 0-1 km storm-relative helicity
- 4 m²/s²
- 0-3 km storm-relative helicity
- 143 m²/s²
- Significant tornado parameter
- 0.3
- Supercell composite
- 3.5
The text
As transmitted.
968
WUUS53 KDMX 310358
SVRDMX
IAC009-027-047-073-077-310500-
/O.NEW.KDMX.SV.W.0110.210831T0358Z-210831T0500Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
1058 PM CDT Mon Aug 30 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Southwestern Greene County in west central Iowa...
Northwestern Guthrie County in west central Iowa...
Northern Audubon County in west central Iowa...
Southeastern Crawford County in west central Iowa...
Carroll County in west central Iowa...
* Until midnight CDT.
* At 1058 PM CDT, a severe thunderstorm was located near Manning, or
9 miles southwest of Carroll, 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.
* Locations impacted include...
Coon Rapids.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4221 9508 4221 9505 4206 9444 4157 9467
4176 9510 4186 9510 4186 9522
TIME...MOT...LOC 0358Z 294DEG 23KT 4195 9495
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
REV3 follow-up statements
744
WWUS53 KDMX 310423
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
1123 PM CDT Mon Aug 30 2021
IAC009-027-047-073-077-310500-
/O.CON.KDMX.SV.W.0110.000000T0000Z-210831T0500Z/
Greene IA-Guthrie IA-Audubon IA-Crawford IA-Carroll IA-
1123 PM CDT Mon Aug 30 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT
FOR SOUTHWESTERN GREENE...NORTHWESTERN GUTHRIE...NORTHERN AUDUBON...
SOUTHEASTERN CRAWFORD AND CARROLL COUNTIES...
At 1122 PM CDT, a severe thunderstorm was located near Coon Rapids,
or 13 miles southeast of Carroll, moving southeast at 25 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Carroll, Audubon, Manning, Coon Rapids, Glidden, Scranton, Arcadia,
Breda, Bayard, Templeton, Westside, Dedham, Halbur, Lidderdale,
Willey, Ralston, Gray, Aspinwall, Arthur N Neu Airport and Manning
Municipal Airport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4221 9508 4221 9505 4206 9444 4157 9467
4176 9510 4186 9510 4186 9522
TIME...MOT...LOC 0422Z 294DEG 23KT 4189 9476
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
REV652
WWUS53 KDMX 310442
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
1142 PM CDT Mon Aug 30 2021
IAC009-027-047-073-077-310500-
/O.CON.KDMX.SV.W.0110.000000T0000Z-210831T0500Z/
Greene IA-Guthrie IA-Audubon IA-Crawford IA-Carroll IA-
1142 PM CDT Mon Aug 30 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL MIDNIGHT CDT
FOR SOUTHWESTERN GREENE...NORTHWESTERN GUTHRIE...NORTHERN AUDUBON...
SOUTHEASTERN CRAWFORD AND SOUTHERN CARROLL COUNTIES...
At 1142 PM CDT, a severe thunderstorm was located near Lake Panorama,
or near Guthrie Center, moving east 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.
Locations impacted include...
Audubon, Manning, Coon Rapids, Bayard, Templeton, Dedham, Gray,
Audubon County Airport and Manning Municipal Airport.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4157 9467 4176 9510 4186 9510 4200 9502
4192 9451
TIME...MOT...LOC 0442Z 291DEG 32KT 4174 9452
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
REV339
WWUS53 KDMX 310500
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
1200 AM CDT Tue Aug 31 2021
IAC009-027-047-073-077-310510-
/O.EXP.KDMX.SV.W.0110.000000T0000Z-210831T0500Z/
Greene IA-Guthrie IA-Audubon IA-Crawford IA-Carroll IA-
1200 AM CDT Tue Aug 31 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN GREENE...
NORTHWESTERN GUTHRIE...NORTHERN AUDUBON...SOUTHEASTERN CRAWFORD AND
SOUTHERN CARROLL COUNTIES HAS EXPIRED...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been allowed to expire. However gusty
winds and heavy rain are still possible with this thunderstorm.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
Des Moines .
LAT...LON 4157 9467 4176 9510 4186 9510 4200 9502
4192 9451
TIME...MOT...LOC 0500Z 294DEG 23KT 4170 9439
$$
REVThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 9:58 PM CDT | Severe Thunderstorm Warning | DMX | Carroll, Crawford, Sac | 62 min |
| Aug 30, 10:50 PM CDT | Severe Thunderstorm Warning | DMX | Carroll, Crawford | 55 min |
| Aug 30, 11:29 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Marshall, Polk, Story | 46 min |
| Aug 30, 11:50 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Marshall | 40 min |
| Aug 30, 11:54 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Madison, Marion, Polk, Warren | 36 min |
| Aug 31, 12:07 AM CDT | Severe Thunderstorm Warning | DMX | Adair, Audubon, Cass, Guthrie | 38 min |
| Aug 31, 12:35 AM CDT | Special Weather Statement | DMX | Clarke, Lucas, Madison, Marion, Union, Warren | 70 min |
| Aug 31, 9:16 AM CDT | Areal Flood Warning | DMX | Black Hawk | 2 hr |
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.