Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 142, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 28, 2021, 8:17 PM CDT for Cottonwood County, Lyon County, Murray County, Minnesota. It was in force for 58 min. 2 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 28, 2021, 8:17 PM CDT (01:17 UTC)
- Expired
- Aug 28, 2021, 9:15 PM CDT
- In force
- 58 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Tornado
- Possible
- Damage threat
- Considerable
- Hail
- 1.75 in
- Wind
- 60.0 mph
Counties Cottonwood County, MN, Lyon County, MN, Murray County, MN
The radar
The Sioux Falls radar (KFSD), 121 km from the middle of the area, began a volume at 01:21 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 28, 8:21 PM CDT | HAIL 1.75 | 4 N Currie, MN | LOTS OF GOLF BALL SIZED HAIL AND HEAVY RAINFALL 3.40 INCHES SO FAR. |
| Aug 28, 8:39 PM CDT | TSTM WND GST 59 | 3 W Dovray, MN | DELAYED REPORT FROM MESONET STATION MN038 DOVRAY MN-30 MILE POST 49. |
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 28, 3:44 PM CDT | Tornado Watch | SPC | 5 hr |
| Aug 28, 3:57 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Minneapolis, MN (KMPX), launched 00:00Z, 1.3 hours before the alert went out and 165 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
- 1990 J/kg
- Mixed-layer CIN
- -120 J/kg
- Mixed-layer LCL
- 977 m above ground
- 0-6 km bulk shear
- 31 kt
- 0-1 km storm-relative helicity
- 252 m²/s²
- 0-3 km storm-relative helicity
- 227 m²/s²
- Significant tornado parameter
- 1.0
- Supercell composite
- 5.0
The text
As transmitted.
172
WUUS53 KFSD 290117
SVRFSD
MNC033-083-101-290215-
/O.NEW.KFSD.SV.W.0142.210829T0117Z-210829T0215Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
817 PM CDT Sat Aug 28 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Southeastern Lyon County in southwestern Minnesota...
Northeastern Murray County in southwestern Minnesota...
Northwestern Cottonwood County in southwestern Minnesota...
* Until 915 PM CDT.
* At 816 PM CDT, a severe thunderstorm was located near Lake Shetek
State Park, or 10 miles northeast of Slayton, moving northeast at
20 mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect
wind damage to roofs, siding, and trees.
* This severe thunderstorm will be near...
Dovray around 825 PM CDT.
Tracy around 835 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 900 PM CDT for southwestern
Minnesota.
For your protection move to an interior room on the lowest floor of a
building.
A Tornado Watch remains in effect until 900 PM CDT for southwestern
Minnesota.
&&
LAT...LON 4398 9572 4424 9583 4431 9559 4419 9559
4419 9511 4411 9510 4411 9506 4404 9503
TIME...MOT...LOC 0116Z 243DEG 18KT 4413 9565
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Kalin2 follow-up statements
496
WWUS53 KFSD 290122
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
822 PM CDT Sat Aug 28 2021
MNC033-083-101-290215-
/O.CON.KFSD.SV.W.0142.000000T0000Z-210829T0215Z/
Lyon MN-Murray MN-Cottonwood MN-
822 PM CDT Sat Aug 28 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR SOUTHEASTERN LYON...NORTHEASTERN MURRAY AND NORTHWESTERN
COTTONWOOD COUNTIES...
At 822 PM CDT, a severe thunderstorm was located near Lake Shetek
State Park, or 12 miles northeast of Slayton, moving northeast at 20
mph.
HAZARD...Golf ball size hail and 60 mph wind gusts.
SOURCE...Trained weather spotters reported golf ball size hail 4
miles north of Currie at 820 pm.
IMPACT...People and animals outdoors will be injured. Expect hail
damage to roofs, siding, windows, and vehicles. Expect wind
damage to roofs, siding, and trees.
This severe storm will be near...
Tracy around 830 PM CDT.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
A Tornado Watch remains in effect until 900 PM CDT for southwestern
Minnesota.
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4398 9572 4424 9583 4431 9559 4419 9559
4419 9511 4411 9510 4411 9506 4404 9503
TIME...MOT...LOC 0122Z 243DEG 18KT 4414 9561
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Kalin181
WWUS53 KFSD 290209
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
909 PM CDT Sat Aug 28 2021
MNC033-083-101-290218-
/O.EXP.KFSD.SV.W.0142.000000T0000Z-210829T0215Z/
Lyon MN-Murray MN-Cottonwood MN-
909 PM CDT Sat Aug 28 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LYON...
NORTHEASTERN MURRAY AND NORTHWESTERN COTTONWOOD COUNTIES WILL EXPIRE
AT 915 PM 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.
A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
southwestern Minnesota.
LAT...LON 4398 9572 4424 9583 4431 9559 4419 9559
4419 9511 4411 9510 4411 9506 4404 9503
TIME...MOT...LOC 0208Z 243DEG 18KT 4424 9533
$$
KalinThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 28, 7:00 PM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Lyon, Murray, Pipestone | 45 min |
| Aug 28, 7:23 PM CDT | Severe Thunderstorm Warning | FSD | Rock | 52 min |
| Aug 28, 7:34 PM CDT | Severe Thunderstorm Warning | FSD | Lyon, Murray, Pipestone | 56 min |
| Aug 28, 7:48 PM CDT | Severe Thunderstorm Warning | FSD | Rock | 31 min |
| Aug 28, 8:03 PM CDT | Flash Flood Warning | FSD | Murray, Pipestone | 6 hr |
| Aug 28, 8:06 PM CDT | Severe Thunderstorm Warning | FSD | Nobles, Rock | 54 min |
| Aug 28, 8:52 PM CDT | Severe Thunderstorm Warning | FSD | Murray, Nobles, Rock | 23 min |
| Aug 28, 9:13 PM CDT | Severe Thunderstorm Warning | FSD | Jackson, Nobles, Rock | 47 min |
| Aug 28, 9:29 PM CDT | Flash Flood Warning | FSD | Murray, Nobles, Pipestone, Rock | 3 hr |
| Aug 28, 10:04 PM CDT | Flash Flood Warning | FSD | Cottonwood, Jackson, Murray, Nobles | 4 hr |
| Aug 28, 10:24 PM CDT | Flash Flood Warning | FSD | Cottonwood, Jackson | 5 hr |
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.