Alert archive / Iowa / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 38, NWS Des Moines, IA
NWS Des Moines, IA issued this severe thunderstorm warning at Jun 20, 2021, 5:55 PM CDT for Jasper County, Mahaska County, Marion County, Iowa. It was in force for 50 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
- Jun 20, 2021, 5:55 PM CDT (22:55 UTC)
- Expired
- Jun 20, 2021, 6:45 PM CDT
- In force
- 50 min
- Issued by
- NWS Des Moines, IA
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Jasper County, IA, Mahaska County, IA, Marion County, IA
The radar
The Des Moines radar (KDMX), 61 km from the middle of the area, began a volume at 22:54 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 |
|---|---|---|---|
| Jun 20, 6:43 PM CDT | TORNADO | 2 Nnw Pella, IA | PICTURE ON SOCIAL MEDIA. |
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 |
|---|---|---|---|
| Jun 20, 4:01 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Davenport, (KDVN), launched 12:00Z, 10.9 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
- 2060 m above ground
- 0-6 km bulk shear
- 21 kt
- 0-1 km storm-relative helicity
- 102 m²/s²
- 0-3 km storm-relative helicity
- 84 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
336
WUUS53 KDMX 202255
SVRDMX
IAC099-123-125-202345-
/O.NEW.KDMX.SV.W.0038.210620T2255Z-210620T2345Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Des Moines IA
555 PM CDT Sun Jun 20 2021
The National Weather Service in Des Moines has issued a
* Severe Thunderstorm Warning for...
Northern Marion County in south central Iowa...
Northwestern Mahaska County in south central Iowa...
Southern Jasper County in central Iowa...
* Until 645 PM CDT.
* At 552 PM CDT, a severe thunderstorm was located near Prairie City,
or 13 miles east of Pleasant Hill, moving east at 20 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.
* This severe thunderstorm will be near...
Monroe around 610 PM CDT.
Other locations in the path of this severe thunderstorm include Lake
Red Rock and Pella.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4129 9289 4144 9333 4155 9333 4163 9328
4154 9277
TIME...MOT...LOC 2252Z 289DEG 18KT 4153 9323
HAIL...1.00IN
WIND...60MPH
$$
REV1 follow-up statement
484
WWUS53 KDMX 202323
SVSDMX
Severe Weather Statement
National Weather Service Des Moines IA
623 PM CDT Sun Jun 20 2021
IAC099-123-125-202345-
/O.CON.KDMX.SV.W.0038.000000T0000Z-210620T2345Z/
Marion IA-Mahaska IA-Jasper IA-
623 PM CDT Sun Jun 20 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 645 PM CDT
FOR NORTHERN MARION...NORTHWESTERN MAHASKA AND SOUTHEASTERN JASPER
COUNTIES...
At 623 PM CDT, a severe thunderstorm was located near Monroe, or 7
miles northwest of Pella, moving east at 20 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Pella.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4129 9289 4143 9330 4153 9323 4160 9311
4154 9277
TIME...MOT...LOC 2323Z 289DEG 18KT 4148 9303
HAIL...1.00IN
WIND...60MPH
$$
REVThe office that day
Everything else NWS Des Moines, IA issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Jun 20, 3:38 PM CDT | Special Weather Statement | DMX | Dallas | 37 min |
| Jun 20, 4:20 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Madison, Union | 55 min |
| Jun 20, 4:47 PM CDT | Severe Thunderstorm Warning | DMX | Jasper | 43 min |
| Jun 20, 4:53 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Ringgold, Union | 52 min |
| Jun 20, 4:54 PM CDT | Severe Thunderstorm Warning | DMX | Bremer, Butler, Franklin | 51 min |
| Jun 20, 5:33 PM CDT | Severe Thunderstorm Warning | DMX | Jasper, Poweshiek | 42 min |
| Jun 20, 5:35 PM CDT | Severe Thunderstorm Warning | DMX | Clarke, Decatur, Lucas, Wayne | 40 min |
| Jun 20, 5:59 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Wayne | 46 min |
| Jun 20, 6:04 PM CDT | Tornado Warning | DMX | Decatur | 26 min |
| Jun 20, 6:13 PM CDT | Severe Thunderstorm Warning | DMX | Poweshiek | 62 min |
| Jun 20, 6:15 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Wayne | 30 min |
| Jun 20, 6:20 PM CDT | Severe Thunderstorm Warning | DMX | Black Hawk | 55 min |
| Jun 20, 6:37 PM CDT | Tornado Warning | DMX | Mahaska, Marion | 23 min |
| Jun 20, 6:43 PM CDT | Severe Thunderstorm Warning | DMX | Decatur, Wayne | 47 min |
| Jun 20, 6:59 PM CDT | Tornado Warning | DMX | Mahaska, Marion | 31 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.