Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 107, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 26, 2021, 10:01 AM CDT for 5 counties in South Dakota. It was in force for 59 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 26, 2021, 10:01 AM CDT (15:01 UTC)
- Expired
- Aug 26, 2021, 11:00 AM CDT
- In force
- 59 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 0.75 in
- Wind
- 60.0 mph
Counties Brookings County, SD, Kingsbury County, SD, Lake County, SD, Miner County, SD, Moody County, SD
The radar
The Sioux Falls radar (KFSD), 80 km from the middle of the area, began a volume at 15:03 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 26, 10:15 AM CDT | TSTM WND DMG | Arlington, SD | TREE FELL ON CAR IN ARLINGTON, SPOTTER ALSO ESTIMATED WINDS TO BE 50-60 MPH. SHORT LIVED EVENT. |
| Aug 26, 10:22 AM CDT | TSTM WND DMG | Sinai, SD | SOC MEDIA REPORT OF TREES DOWN IN THE LAKE SINAI AREA. |
| Aug 26, 10:37 AM CDT | TSTM WND DMG | Aurora, SD | SMALL METAL SHED DESTROYED. |
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, 9:05 AM CDT | Severe Thunderstorm Watch | SPC | 4 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 12:00Z, 3.0 hours before the alert went out and 138 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
- 1092 m above ground
- 0-6 km bulk shear
- 62 kt
- 0-1 km storm-relative helicity
- 365 m²/s²
- 0-3 km storm-relative helicity
- 490 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- -0.4
The text
As transmitted.
703
WUUS53 KFSD 261501
SVRFSD
SDC011-077-079-097-101-261600-
/O.NEW.KFSD.SV.W.0107.210826T1501Z-210826T1600Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1001 AM CDT Thu Aug 26 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Northwestern Moody County in east central South Dakota...
Eastern Kingsbury County in east central South Dakota...
Northern Lake County in east central South Dakota...
Northeastern Miner County in east central South Dakota...
Brookings County in east central South Dakota...
* Until 1100 AM CDT.
* At 1000 AM CDT, severe thunderstorms were located along a line
extending from near Watertown to near Badger to 9 miles south of
Lake Thompson State Recreation Area, moving east at 45 mph.
HAZARD...60 mph wind gusts.
SOURCE...Radar indicated.
IMPACT...Expect damage to roofs, siding, and trees.
* Severe thunderstorms will be near...
Badger around 1005 AM CDT.
Ramona and Oakwood State Park around 1020 AM CDT.
Other locations in the path of these severe thunderstorms include
Bruce, Nunda and White.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
If on area lakes, get away from the water and move indoors or inside
a vehicle. Remember, lightning can strike out to 15 miles from the
parent thunderstorm. If you can hear thunder, you are close enough
to be struck by lightning. Move to safe shelter now! Do not be
caught on the water in a thunderstorm.
&&
LAT...LON 4430 9645 4401 9667 4414 9775 4454 9741
4454 9645
TIME...MOT...LOC 1500Z 285DEG 38KT 4488 9710 4452 9725 4418 9751
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
Kalin3 follow-up statements
005
WWUS53 KFSD 261508
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
1008 AM CDT Thu Aug 26 2021
SDC011-077-079-097-101-261600-
/O.CON.KFSD.SV.W.0107.000000T0000Z-210826T1600Z/
Moody SD-Kingsbury SD-Lake SD-Miner SD-Brookings SD-
1008 AM CDT Thu Aug 26 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 AM CDT
FOR NORTHWESTERN MOODY...EASTERN KINGSBURY...NORTHERN LAKE...
NORTHEASTERN MINER AND BROOKINGS COUNTIES...
At 1007 AM CDT, severe thunderstorms were located along a line
extending from 6 miles southeast of Watertown to Badger to 8 miles
southwest of Oldham, moving east at 45 mph.
HAZARD...70 mph wind gusts.
SOURCE...Emergency management reported multiple trees down in De
Smet around 950 am.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Ramona, Oakwood State Park, Bruce, Nunda and White.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
If on area lakes, get away from the water and move indoors or inside
a vehicle. Remember, lightning can strike out to 15 miles from the
parent thunderstorm. If you can hear thunder, you are close enough
to be struck by lightning. Move to safe shelter now! Do not be
caught on the water in a thunderstorm.
&&
LAT...LON 4430 9645 4401 9667 4414 9775 4454 9741
4454 9645
TIME...MOT...LOC 1507Z 285DEG 38KT 4487 9705 4451 9720 4417 9746
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
Kalin725
WWUS53 KFSD 261531
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
1031 AM CDT Thu Aug 26 2021
SDC011-077-079-097-101-261600-
/O.CON.KFSD.SV.W.0107.000000T0000Z-210826T1600Z/
Moody SD-Kingsbury SD-Lake SD-Miner SD-Brookings SD-
1031 AM CDT Thu Aug 26 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 AM CDT
FOR NORTHWESTERN MOODY...EASTERN KINGSBURY...NORTHERN LAKE...
NORTHEASTERN MINER AND BROOKINGS COUNTIES...
At 1030 AM CDT, severe thunderstorms were located along a line
extending from near Altamont to near Bruce to near Nunda, moving east
at 45 mph.
HAZARD...70 mph wind gusts.
SOURCE...Law enforcement reported trees down in Arlington at around
1015 am.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
White.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4430 9645 4401 9667 4414 9775 4435 9735
4454 9723 4454 9645
TIME...MOT...LOC 1530Z 285DEG 38KT 4480 9667 4444 9683 4410 9709
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
Kalin207
WWUS53 KFSD 261542
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
1042 AM CDT Thu Aug 26 2021
SDC077-097-261551-
/O.CAN.KFSD.SV.W.0107.000000T0000Z-210826T1600Z/
Kingsbury SD-Miner SD-
1042 AM CDT Thu Aug 26 2021
...THE SEVERE THUNDERSTORM WARNING FOR EASTERN KINGSBURY AND
NORTHEASTERN MINER COUNTIES IS CANCELLED...
The storms which prompted the warning have moved out of the warned
area. Therefore, the warning has been cancelled.
A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
southwestern Minnesota...and east central South Dakota.
LAT...LON 4430 9645 4401 9667 4410 9737 4420 9712
4454 9708 4454 9645
TIME...MOT...LOC 1541Z 285DEG 38KT 4478 9656 4442 9672 4408 9698
$$
SDC011-079-101-261600-
/O.CON.KFSD.SV.W.0107.000000T0000Z-210826T1600Z/
Moody SD-Lake SD-Brookings SD-
1042 AM CDT Thu Aug 26 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 AM CDT
FOR NORTHWESTERN MOODY...NORTHERN LAKE AND BROOKINGS COUNTIES...
At 1041 AM CDT, severe thunderstorms were located along a line
extending from near Moritz to near White to near Wentworth, moving
east at 45 mph.
HAZARD...70 mph wind gusts.
SOURCE...Law enforcement reported trees down in Arlington.
IMPACT...Expect considerable tree damage. Damage is likely to mobile
homes, roofs, and outbuildings.
Locations impacted include...
Brookings, Volga, Aurora, White, Bruce, Ramona, Sinai, Nunda, Oakwood
State Park and Bushnell.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4430 9645 4401 9667 4410 9737 4420 9712
4454 9708 4454 9645
TIME...MOT...LOC 1541Z 285DEG 38KT 4478 9656 4442 9672 4408 9698
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH
$$
KalinThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 26, 4:58 AM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Yankton | 27 min |
| Aug 26, 9:18 AM CDT | Severe Thunderstorm Warning | FSD | Beadle, Kingsbury | 57 min |
| Aug 26, 10:39 AM CDT | Severe Thunderstorm Warning | FSD | Brookings | 66 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.