Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 99, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 24, 2021, 8:16 AM CDT for Cottonwood County, Murray County, Minnesota. It was in force for 44 min. 3 reports 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, 8:16 AM CDT (13:16 UTC)
- Expired
- Aug 24, 2021, 9:00 AM CDT
- In force
- 44 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Cottonwood County, MN, Murray County, MN
The radar
The Sioux Falls radar (KFSD), 109 km from the middle of the area, began a volume at 13:17 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, 8:32 AM CDT | HAIL 1 | Avoca, MN | CORRECTS PREVIOUS HAIL REPORT FROM AVOCA. HE SAID IT HAD BEEN HAILING ABOUT 7 MINUTES AND IT WAS STARTING TO LET UP. |
| Aug 24, 8:42 AM CDT | HAIL 1 | Avoca, MN | HE SAID IT HAD BEEN HAILING ABOUT 7 MINUTES AND IT WAS STARTING TO LET UP. |
| Aug 24, 9:05 AM CDT | HAIL 1 | 6 S Westbrook, MN | CORRECTS PREVIOUS HAIL REPORT FROM 6 S WESTBROOK. SAID HE WAS AT THE INTERSECTION OF COUNTY ROAD 7 AND COUNTY ROAD 13 AND IT WAS ACTIVELY HAILING DIME TO QUARTERS. HE CALLED AT 0915 ON 24AUG. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Minneapolis, MN (KMPX), launched 12:00Z, 1.3 hours before the alert went out and 177 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
- 1192 J/kg
- Mixed-layer CIN
- -180 J/kg
- Mixed-layer LCL
- 1234 m above ground
- 0-6 km bulk shear
- 51 kt
- 0-1 km storm-relative helicity
- 141 m²/s²
- 0-3 km storm-relative helicity
- 178 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 6.9
The text
As transmitted.
183
WUUS53 KFSD 241316
SVRFSD
MNC033-101-241400-
/O.NEW.KFSD.SV.W.0099.210824T1316Z-210824T1400Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
816 AM CDT Tue Aug 24 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Murray County in southwestern Minnesota...
Western Cottonwood County in southwestern Minnesota...
* Until 900 AM CDT.
* At 815 AM CDT, severe thunderstorms were located along a line
extending from near Walnut Grove to near Dovray to Slayton, 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...
Slayton, Fulda, Westbrook, Jeffers, Chandler, Currie, Storden,
Dovray, Lake Shetek State Park, Avoca, Iona and Hadley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4386 9537 4386 9602 4402 9591 4420 9564
4419 9511 4411 9510
TIME...MOT...LOC 1315Z 249DEG 32KT 4419 9555 4410 9559 4397 9577
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
BP1 follow-up statement
917
WWUS53 KFSD 241351
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
851 AM CDT Tue Aug 24 2021
MNC033-101-241400-
/O.CON.KFSD.SV.W.0099.000000T0000Z-210824T1400Z/
Murray MN-Cottonwood MN-
851 AM CDT Tue Aug 24 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 900 AM CDT
FOR SOUTHERN MURRAY AND WESTERN COTTONWOOD COUNTIES...
At 851 AM CDT, severe thunderstorms were located along a line
extending from 6 miles east of Lamberton to near Jeffers to near
Westbrook, moving east at 35 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...A trained weather spotter reported quarter sized hail in
Avoca MN.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Slayton, Fulda, Westbrook, Jeffers, Chandler, Currie, Storden,
Dovray, Avoca, Iona and Hadley.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4386 9537 4386 9602 4402 9584 4408 9565
4420 9544 4419 9511 4411 9510
TIME...MOT...LOC 1351Z 249DEG 32KT 4421 9514 4410 9524 4398 9549
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
BPThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 24, 8:59 AM CDT | Severe Thunderstorm Warning | FSD | Cottonwood, Murray | 61 min |
| Aug 24, 9:43 AM CDT | Severe Thunderstorm Warning | FSD | Nobles | 47 min |
| Aug 24, 10:00 AM CDT | Severe Thunderstorm Warning | FSD | Cottonwood, Jackson, Nobles, Rock | 45 min |
| Aug 24, 10:44 AM CDT | Severe Thunderstorm Warning | FSD | Jackson, Nobles | 30 min |
Nearby
Severe Thunderstorm Warnings in Minnesota, 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.