Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 131, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Dec 15, 2021, 6:47 PM CST for 4 counties in Iowa. It was in force for 43 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
- Dec 15, 2021, 6:47 PM CST (00:47 UTC)
- Expired
- Dec 15, 2021, 7:30 PM CST
- In force
- 43 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Grundy County, IA, Hardin County, IA, Marshall County, IA, Story County, IA
The radar
The Des Moines radar (KDMX), 69 km from the middle of the area, began a volume at 00:47 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 |
|---|---|---|---|
| Dec 15, 7:15 PM CST | TSTM WND DMG | 2 N Gilman, IA | SNAPPED POWER POLES. 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 |
|---|---|---|---|
| Dec 15, 1:23 PM CST | Tornado Watch | SPC | 7 hr |
The nearest sounding before it
Davenport, (KDVN), launched 00:00Z, 0.8 hours before the alert went out and 223 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
- 229 J/kg
- Mixed-layer CIN
- -358 J/kg
- Mixed-layer LCL
- 1061 m above ground
- 0-6 km bulk shear
- 56 kt
- 0-1 km storm-relative helicity
- 433 m²/s²
- 0-3 km storm-relative helicity
- 496 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
428
WUUS53 KDMX 160047
SVRDMX
IAC075-083-127-169-160130-
/O.NEW.KDMX.SV.W.0131.211216T0047Z-211216T0130Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
647 PM CST Wed Dec 15 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Eastern Story County in central Iowa...
Marshall County in central Iowa...
Eastern Hardin County in central Iowa...
Southwestern Grundy County in central Iowa...
* Until 730 PM CST.
* At 646 PM CST, severe thunderstorms were located along a line
extending from near Aplington to 8 miles southeast of State Center,
moving east at 55 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to
mobile homes, roofs, and outbuildings.
* Severe thunderstorms will be near...
Marshalltown around 700 PM CST.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect for the warned area. Tornadoes can
develop quickly from severe thunderstorms. Although a tornado is not
immediately likely, if one is spotted, act quickly and move to a
place of safety inside a sturdy structure such as a basement or small
interior room.
This is a DANGEROUS SITUATION. These storms are producing widespread
wind damage across portions of central Iowa. SEEK SHELTER NOW inside
a sturdy structure and stay away from windows! A Tornado Watch
remains in effect until 800 PM CST for central and north central
Iowa.
&&
LAT...LON 4186 9334 4244 9322 4256 9315 4256 9313
4187 9276 4186 9277
TIME...MOT...LOC 0046Z 252DEG 48KT 4259 9296 4193 9305
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
Cogil1 follow-up statement
184
WWUS53 KDMX 160130
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
730 PM CST Wed Dec 15 2021
IAC075-083-127-169-160139-
/O.EXP.KDMX.SV.W.0131.000000T0000Z-211216T0130Z/
Story IA-Marshall IA-Hardin IA-Grundy IA-
730 PM CST Wed Dec 15 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN STORY...MARSHALL...
EASTERN HARDIN AND SOUTHWESTERN GRUNDY COUNTIES WILL EXPIRE AT 730 PM
CST...
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.
A Tornado Watch remains in effect until 800 PM CST for central and
north central Iowa.
LAT...LON 4186 9334 4244 9322 4256 9315 4256 9313
4187 9276 4186 9277
TIME...MOT...LOC 0129Z 252DEG 48KT 4276 9224 4210 9233
$$
CogilThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Dec 15, 6:13 PM CST | Severe Thunderstorm Warning | DMX | Appanoose, Clarke, Decatur, Lucas, Marion, Monroe and 2 more | 62 min |
| Dec 15, 6:19 PM CST | Tornado Warning | DMX | Hancock, Kossuth, Winnebago | 41 min |
| Dec 15, 6:24 PM CST | Severe Thunderstorm Warning | DMX | Clarke, Dallas, Jasper, Lucas, Madison, Mahaska and 5 more | 66 min |
| Dec 15, 6:30 PM CST | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer, Butler, Cerro Gordo, Franklin, Grundy and 6 more | 75 min |
| Dec 15, 6:37 PM CST | Tornado Warning | DMX | Butler, Cerro Gordo, Franklin | 20 min |
| Dec 15, 7:09 PM CST | Severe Thunderstorm Warning | DMX | Appanoose, Davis, Jasper, Lucas, Mahaska, Marion and 5 more | 66 min |
| Dec 15, 7:44 PM CST | Severe Thunderstorm Warning | DMX | Black Hawk, Bremer, Butler, Grundy, Tama | 27 min |
| Dec 15, 11:52 PM CST | Wind Advisory | DMX | Adair, Adams, Appanoose, Audubon, Black Hawk, Boone and 45 more | 6 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.