Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 109, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 26, 2021, 11:05 PM CDT for Hutchinson County, Turner County, Yankton County, South Dakota. It was in force for 25 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 26, 2021, 11:05 PM CDT (04:05 UTC)
- Expired
- Aug 26, 2021, 11:30 PM CDT
- In force
- 25 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Hutchinson County, SD, Turner County, SD, Yankton County, SD
The radar
The Sioux Falls radar (KFSD), 76 km from the middle of the area, began a volume at 04:09 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 watch it was issued in
The SPC watch in force over the same counties when this warning went out.
| Issued | Product | Office | Lasted |
|---|---|---|---|
| Aug 26, 8:03 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 4.1 hours before the alert went out and 214 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
- 5342 J/kg
- Mixed-layer CIN
- -16 J/kg
- Mixed-layer LCL
- 1163 m above ground
- 0-6 km bulk shear
- 27 kt
- 0-1 km storm-relative helicity
- 111 m²/s²
- 0-3 km storm-relative helicity
- 199 m²/s²
- Significant tornado parameter
- 3.8
- Supercell composite
- 24.0
The text
As transmitted.
852
WUUS53 KFSD 270405
SVRFSD
SDC067-125-135-270430-
/O.NEW.KFSD.SV.W.0109.210827T0405Z-210827T0430Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1105 PM CDT Thu Aug 26 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Northern Yankton County in southeastern South Dakota...
Southern Turner County in southeastern South Dakota...
Southeastern Hutchinson County in southeastern South Dakota...
* Until 1130 PM CDT.
* At 1104 PM CDT, a pair of severe thunderstorms were located near
Mayfield, or 15 miles north of Yankton, moving northeast at 30 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...
Mayfield around 1110 PM CDT.
Other locations in the path of this severe thunderstorm include
Viborg.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4290 9754 4306 9764 4317 9764 4317 9768
4336 9729 4314 9698 4308 9712 4308 9716
4306 9716
TIME...MOT...LOC 0404Z 237DEG 28KT 4312 9743
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SG2 follow-up statements
216
WWUS53 KFSD 270421
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
1121 PM CDT Thu Aug 26 2021
SDC067-125-135-270430-
/O.CON.KFSD.SV.W.0109.000000T0000Z-210827T0430Z/
Yankton SD-Turner SD-Hutchinson SD-
1121 PM CDT Thu Aug 26 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1130 PM CDT
FOR NORTHEASTERN YANKTON...SOUTHERN TURNER AND SOUTHEASTERN
HUTCHINSON COUNTIES...
At 1121 PM CDT, a severe thunderstorm was located 7 miles north of
Mayfield, or 16 miles southwest of Parker, moving northeast at 30
mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
Locations impacted include...
Viborg.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4300 9731 4313 9746 4324 9754 4336 9729
4314 9698 4308 9712 4308 9716 4306 9716
TIME...MOT...LOC 0421Z 239DEG 27KT 4318 9728
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SG631
WWUS53 KFSD 270428
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
1128 PM CDT Thu Aug 26 2021
SDC067-125-135-270437-
/O.EXP.KFSD.SV.W.0109.000000T0000Z-210827T0430Z/
Yankton SD-Turner SD-Hutchinson SD-
1128 PM CDT Thu Aug 26 2021
...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN YANKTON...
SOUTHERN TURNER AND SOUTHEASTERN HUTCHINSON COUNTIES WILL EXPIRE AT
1130 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 heavy rain
is still possible with this thunderstorm.
A Severe Thunderstorm Watch remains in effect until 300 AM CDT for
southeastern South Dakota.
LAT...LON 4300 9731 4313 9746 4324 9754 4336 9729
4314 9698 4308 9712 4308 9716 4306 9716
TIME...MOT...LOC 0427Z 237DEG 28KT 4321 9723
$$
SGThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 27, 12:08 AM CDT | Severe Thunderstorm Warning | FSD | Clay, Lincoln, Turner, Union | 37 min |
| Aug 27, 12:17 AM CDT | Severe Thunderstorm Warning | FSD | Lincoln | 28 min |
| Aug 27, 12:34 AM CDT | Severe Thunderstorm Warning | FSD | Lincoln, Union | 41 min |
Nearby
Severe Thunderstorm Warnings in South Dakota, 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.