Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 110, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 27, 2021, 12:08 AM CDT for 4 counties in South Dakota. It was in force for 37 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
- Aug 27, 2021, 12:08 AM CDT (05:08 UTC)
- Expired
- Aug 27, 2021, 12:45 AM CDT
- In force
- 37 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Tornado
- Possible
- Damage threat
- Considerable
- Hail
- 0.75 in
- Wind
- 70.0 mph
Counties Clay County, SD, Lincoln County, SD, Turner County, SD, Union County, SD
The radar
The Sioux Falls radar (KFSD), 55 km from the middle of the area, began a volume at 05:07 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 27, 12:18 AM CDT | TSTM WND DMG | 2 Nnw Beresford, SD | DELAYED REPORT - SOCIAL MEDIA REPORT INDICATES A BILLBOARD ON THE NORTHBOUND SIDE OF I-29 WAS BROKEN IN HALF BY STRONG WINDS. |
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 26, 8:03 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Omaha, NE (KOAX), launched 00:00Z, 5.1 hours before the alert went out and 201 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.
893
WUUS53 KFSD 270508
SVRFSD
SDC027-083-125-127-270545-
/O.NEW.KFSD.SV.W.0110.210827T0508Z-210827T0545Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1208 AM CDT Fri Aug 27 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Northern Clay County in southeastern South Dakota...
Southwestern Lincoln County in southeastern South Dakota...
Southeastern Turner County in southeastern South Dakota...
Northwestern Union County in southeastern South Dakota...
* Until 1245 AM CDT.
* At 1208 AM CDT, severe thunderstorms were located along a line
extending from near Davis to near Centerville to 6 miles southeast
of Wakonda, moving east at 35 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...
Beresford around 1220 AM CDT.
Union Grove State Park around 1225 AM CDT.
Other locations in the path of these severe thunderstorms include
Alcester.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4326 9664 4310 9657 4293 9667 4292 9714
4304 9703 4319 9709
TIME...MOT...LOC 0508Z 260DEG 31KT 4318 9696 4306 9693 4296 9700
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
SG1 follow-up statement
752
WWUS53 KFSD 270521
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
1221 AM CDT Fri Aug 27 2021
SDC125-270530-
/O.CAN.KFSD.SV.W.0110.000000T0000Z-210827T0545Z/
Turner SD-
1221 AM CDT Fri Aug 27 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN TURNER COUNTY IS
CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 300 AM CDT for
southeastern South Dakota.
LAT...LON 4326 9664 4310 9657 4293 9667 4292 9695
4307 9691 4321 9693
TIME...MOT...LOC 0520Z 261DEG 33KT 4318 9681 4306 9676 4294 9684
$$
SDC027-083-127-270545-
/O.CON.KFSD.SV.W.0110.000000T0000Z-210827T0545Z/
Clay SD-Lincoln SD-Union SD-
1221 AM CDT Fri Aug 27 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1245 AM CDT
FOR NORTHEASTERN CLAY...SOUTHWESTERN LINCOLN AND NORTHWESTERN UNION
COUNTIES...
At 1220 AM CDT, severe thunderstorms were located along a line
extending from 9 miles northeast of Centerville to Beresford to near
Union Grove State Park, moving east at 40 mph.
HAZARD...70 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Alcester.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4326 9664 4310 9657 4293 9667 4292 9695
4307 9691 4321 9693
TIME...MOT...LOC 0520Z 261DEG 33KT 4318 9681 4306 9676 4294 9684
TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
SGThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 11:05 PM CDT | Severe Thunderstorm Warning | FSD | Hutchinson, Turner, Yankton | 25 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.