Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 97, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 24, 2021, 4:03 PM CDT for 6 counties in Iowa. It was in force for 57 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 24, 2021, 4:03 PM CDT (21:03 UTC)
- Expired
- Aug 24, 2021, 5:00 PM CDT
- In force
- 57 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Black Hawk County, IA, Grundy County, IA, Hardin County, IA, Marshall County, IA, Poweshiek County, IA, Tama County, IA
The radar
The Des Moines radar (KDMX), 92 km from the middle of the area, began a volume at 21:04 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 |
|---|---|---|---|
| Aug 24, 4:28 PM CDT | TSTM WND DMG | 4 Sw Albion, IA | OFFICERS REPORTED DAMAGE TO THEIR HOME INCLUDING SHINGLES OFF AND TREES DOWN. DELAYED REPORT, TIME ESTIMATED VIA RADAR. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 24, 1:52 PM CDT | Severe Thunderstorm Watch | SPC | 5 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 9.1 hours before the alert went out and 192 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
- 1809 J/kg
- Mixed-layer CIN
- -127 J/kg
- Mixed-layer LCL
- 1284 m above ground
- 0-6 km bulk shear
- 15 kt
- 0-1 km storm-relative helicity
- 35 m²/s²
- 0-3 km storm-relative helicity
- 9 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
358
WUUS53 KDMX 242103
SVRDMX
IAC013-075-083-127-157-171-242200-
/O.NEW.KDMX.SV.W.0097.210824T2103Z-210824T2200Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
403 PM CDT Tue Aug 24 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Northeastern Poweshiek County in central Iowa...
Marshall County in central Iowa...
Southeastern Hardin County in central Iowa...
Southwestern Black Hawk County in northeastern Iowa...
Tama County in central Iowa...
Grundy County in central Iowa...
* Until 500 PM CDT.
* At 402 PM CDT, a severe thunderstorm was located near Conrad, or 9
miles southeast of Eldora, moving east at 50 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...
Reinbeck, Traer and Dysart.
This includes Interstate 380 between mile markers 71 and 73.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4172 9230 4201 9323 4210 9323 4252 9305
4253 9229
TIME...MOT...LOC 2102Z 276DEG 44KT 4226 9298
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Krull2 follow-up statements
476
WWUS53 KDMX 242135
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
435 PM CDT Tue Aug 24 2021
IAC083-242144-
/O.CAN.KDMX.SV.W.0097.000000T0000Z-210824T2200Z/
Hardin IA-
435 PM CDT Tue Aug 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN HARDIN COUNTY IS
CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
central and northeastern Iowa.
LAT...LON 4172 9230 4199 9315 4222 9296 4244 9282
4253 9229
TIME...MOT...LOC 2134Z 276DEG 44KT 4222 9245
$$
IAC013-075-127-157-171-242200-
/O.CON.KDMX.SV.W.0097.000000T0000Z-210824T2200Z/
Poweshiek IA-Marshall IA-Black Hawk IA-Tama IA-Grundy IA-
435 PM CDT Tue Aug 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 500 PM CDT
FOR NORTHEASTERN POWESHIEK...MARSHALL...SOUTHWESTERN BLACK HAWK...
TAMA AND CENTRAL GRUNDY COUNTIES...
At 434 PM CDT, a severe thunderstorm was located over Traer, or 17
miles northeast of Toledo, moving east at 50 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...
Waterloo, Cedar Falls, Marshalltown, Grundy Center, Toledo,
Evansdale, Tama, Hudson, Traer, Reinbeck, Dysart, Dike, Conrad,
Meskwaki Casino, Crossroads Mall, Gladbrook, Le Grand, Victor, Garwin
and Gilman.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4172 9230 4199 9315 4222 9296 4244 9282
4253 9229
TIME...MOT...LOC 2134Z 276DEG 44KT 4222 9245
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Hagenhoff447
WWUS53 KDMX 242158
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
458 PM CDT Tue Aug 24 2021
IAC013-075-127-157-171-242206-
/O.EXP.KDMX.SV.W.0097.000000T0000Z-210824T2200Z/
Poweshiek IA-Marshall IA-Black Hawk IA-Tama IA-Grundy IA-
458 PM CDT Tue Aug 24 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN POWESHIEK...
MARSHALL...SOUTHWESTERN BLACK HAWK...TAMA AND CENTRAL GRUNDY COUNTIES
WILL EXPIRE AT 500 PM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However small hail
and gusty winds are still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
central and northeastern Iowa.
LAT...LON 4172 9230 4199 9315 4222 9296 4244 9282
4253 9229
TIME...MOT...LOC 2156Z 276DEG 44KT 4219 9212
$$
HagenhoffThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 11:06 AM CDT | Special Weather Statement | DMX | Emmet | 24 min |
| Aug 24, 11:30 AM CDT | Special Weather Statement | DMX | Kossuth, Winnebago | 45 min |
| Aug 24, 12:07 PM CDT | Special Weather Statement | DMX | Cerro Gordo, Hancock, Worth | 68 min |
| Aug 24, 12:26 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Hancock | 49 min |
| Aug 24, 12:51 PM CDT | Severe Thunderstorm Warning | DMX | Cerro Gordo, Franklin, Hancock, Wright | 54 min |
| Aug 24, 1:18 PM CDT | Severe Thunderstorm Warning | DMX | Butler | 57 min |
| Aug 24, 1:44 PM CDT | Severe Thunderstorm Warning | DMX | Butler | 31 min |
| Aug 24, 1:53 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer | 67 min |
| Aug 24, 2:17 PM CDT | Special Weather Statement | DMX | Butler | 28 min |
| Aug 24, 3:00 PM CDT | Special Weather Statement | DMX | Black Hawk, Bremer | 30 min |
| Aug 24, 3:28 PM CDT | Severe Thunderstorm Warning | DMX | Hamilton, Hardin, Marshall, Story | 47 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.