Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 112, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Aug 30, 2021, 11:50 PM CDT for Jasper County, Marshall County, Iowa. It was in force for 40 min. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 30, 2021, 11:50 PM CDT (04:50 UTC)
- Expired
- Aug 31, 2021, 12:30 AM CDT
- In force
- 40 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Jasper County, IA, Marshall County, IA
The radar
The Des Moines radar (KDMX), 60 km from the middle of the area, began a volume at 05:08 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.
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 4.8 hours before the alert went out and 216 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
- 0 J/kg
- Mixed-layer CIN
- No buoyant parcel
- Mixed-layer LCL
- 1670 m above ground
- 0-6 km bulk shear
- 26 kt
- 0-1 km storm-relative helicity
- -4 m²/s²
- 0-3 km storm-relative helicity
- 63 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.0
The text
As transmitted.
530
WUUS53 KDMX 310450
SVRDMX
IAC099-127-310530-
/O.NEW.KDMX.SV.W.0112.210831T0450Z-210831T0530Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
1150 PM CDT Mon Aug 30 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Marshall County in central Iowa...
Northeastern Jasper County in central Iowa...
* Until 1230 AM CDT.
* At 1150 PM CDT, a severe thunderstorm was located near State
Center, or 11 miles southwest of Marshalltown, moving east at 40
mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Locations impacted include...
Rock Creek Lake.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4186 9323 4195 9323 4221 9314 4217 9279
4171 9279
TIME...MOT...LOC 0450Z 292DEG 33KT 4195 9311
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
REV2 follow-up statements
389
WWUS53 KDMX 310521
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
1221 AM CDT Tue Aug 31 2021
IAC099-127-310530-
/O.CON.KDMX.SV.W.0112.000000T0000Z-210831T0530Z/
Marshall IA-Jasper IA-
1221 AM CDT Tue Aug 31 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1230 AM CDT
FOR MARSHALL AND NORTHEASTERN JASPER COUNTIES...
At 1221 AM CDT, a severe thunderstorm was located 9 miles south of
Marshalltown, moving east at 25 mph.
HAZARD...60 mph wind gusts and penny size hail.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
Locations impacted include...
Marshalltown, State Center, Rock Creek Lake, Melbourne, Gilman,
Albion, Rhodes, Liscomb, Laurel, Haverhill, Oakland Acres, Clemons,
Ferguson, Green Mountain, Marshalltown Municipal Airport and Rock
Creek State Park.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4186 9323 4195 9323 4221 9314 4217 9279
4171 9279
TIME...MOT...LOC 0521Z 291DEG 24KT 4190 9295
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...0.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
REV554
WWUS53 KDMX 310529 RRA
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
1229 AM CDT Tue Aug 31 2021
IAC099-127-310539-
/O.EXP.KDMX.SV.W.0112.000000T0000Z-210831T0530Z/
Marshall IA-Jasper IA-
1229 AM CDT Tue Aug 31 2021
...THE SEVERE THUNDERSTORM WARNING FOR MARSHALL AND NORTHEASTERN
JASPER COUNTIES WILL EXPIRE AT 1230 AM CDT...
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be 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 4186 9323 4195 9323 4221 9314 4217 9279
4171 9279
TIME...MOT...LOC 0529Z 292DEG 33KT 4187 9287
$$
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, 10:58 PM CDT | Severe Thunderstorm Warning | DMX | Audubon, Carroll, Crawford, Greene, Guthrie | 62 min |
| Aug 30, 11:29 PM CDT | Severe Thunderstorm Warning | DMX | Boone, Dallas, Marshall, Polk, Story | 46 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.