Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 156, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 31, 2021, 1:26 AM CDT for Bon Homme County, Charles Mix County, Gregory County, South Dakota. It was in force for 49 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 31, 2021, 1:26 AM CDT (06:26 UTC)
- Expired
- Aug 31, 2021, 2:15 AM CDT
- In force
- 49 min
- Issued by
- NWS Sioux Falls, SD
- Area
- Storm-based polygon
- Hail
- 1.0 in
- Wind
- 60.0 mph
Counties Bon Homme County, SD, Charles Mix County, SD, Gregory County, SD
The radar
The Sioux Falls radar (KFSD), 159 km from the middle of the area, began a volume at 06:28 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 31, 1:41 AM CDT | TSTM WND GST 55 | 2 Wsw Pickstown, SD | MESONET STATION 244 SD RWIS FT. RANDALL DAM. |
| Aug 31, 1:58 AM CDT | TSTM WND GST 50 | 1 E Wagner, SD | PERSONAL WEATHER STATION RECORDED WIND GUST OF 50 MPH. |
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 30, 9:57 PM CDT | Severe Thunderstorm Watch | SPC | 7 hr |
The nearest sounding before it
Aberdeen, SD (KABR), launched 00:00Z, 6.4 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
- 205 J/kg
- Mixed-layer CIN
- -60 J/kg
- Mixed-layer LCL
- 1953 m above ground
- 0-6 km bulk shear
- 46 kt
- 0-1 km storm-relative helicity
- 34 m²/s²
- 0-3 km storm-relative helicity
- 126 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.3
The text
As transmitted.
981
WUUS53 KFSD 310626
SVRFSD
SDC009-023-053-310715-
/O.NEW.KFSD.SV.W.0156.210831T0626Z-210831T0715Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
126 AM CDT Tue Aug 31 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Southeastern Charles Mix County in south central South Dakota...
Gregory County in south central South Dakota...
Southern Bon Homme County in southeastern South Dakota...
* Until 215 AM CDT.
* At 125 AM CDT, severe thunderstorms were located along a line
extending from 6 miles north of Ravinia to 8 miles north of
Bonesteel to near Gregory, moving southeast at 40 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.
* Severe thunderstorms will be near...
Lake Andes and Ravinia around 130 AM CDT.
Bonesteel around 135 AM CDT.
Wagner and Herrick around 145 AM CDT.
Dante and St. Charles around 150 AM CDT.
Pickstown around 155 AM CDT.
Avon around 200 AM CDT.
Springfield around 215 AM CDT.
Other locations impacted by these severe thunderstorms include
Fairfax and Yankton Sioux Tribal Nation.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4326 9953 4325 9832 4284 9769 4287 9785
4277 9794 4276 9803 4284 9815 4293 9844
4300 9850 4300 9953
TIME...MOT...LOC 0625Z 311DEG 35KT 4322 9845 4320 9894 4322 9939
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
APT1 follow-up statement
927
WWUS53 KFSD 310701
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
201 AM CDT Tue Aug 31 2021
SDC009-023-053-310715-
/O.CON.KFSD.SV.W.0156.000000T0000Z-210831T0715Z/
Charles Mix SD-Gregory SD-Bon Homme SD-
201 AM CDT Tue Aug 31 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 215 AM CDT
FOR SOUTHEASTERN CHARLES MIX...SOUTHEASTERN GREGORY AND SOUTHERN BON
HOMME COUNTIES...
At 201 AM CDT, severe thunderstorms were located along a line
extending from near Avon to near Gross to 7 miles northeast of Butte,
moving southeast at 40 mph.
HAZARD...60 mph wind gusts and quarter size hail.
SOURCE...Radar indicated.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
These severe storms will be near...
Avon and Dante around 205 AM CDT.
Marty around 210 AM CDT.
Springfield around 225 AM CDT.
Other locations impacted by these severe thunderstorms include
Yankton Sioux Tribal Nation.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4318 9888 4319 9823 4284 9769 4287 9785
4277 9794 4276 9803 4284 9815 4293 9844
4300 9850 4300 9886
TIME...MOT...LOC 0701Z 310DEG 35KT 4300 9811 4298 9860 4301 9879
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
APTThe office that day
Everything else NWS Sioux Falls, SD issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 30, 7:29 PM CDT | Severe Thunderstorm Warning | FSD | Clay, Union | 46 min |
| Aug 30, 7:57 PM CDT | Severe Thunderstorm Warning | FSD | Hutchinson, McCook, Minnehaha, Turner | 48 min |
| Aug 30, 11:19 PM CDT | Severe Thunderstorm Warning | FSD | Beadle, Jerauld, Sanborn | 41 min |
| Aug 31, 12:00 AM CDT | Flash Flood Warning | FSD | Aurora, Brule | 3 hr |
| Aug 31, 12:05 AM CDT | Severe Thunderstorm Warning | FSD | Aurora, Davison, Douglas | 40 min |
| Aug 31, 12:15 AM CDT | Severe Thunderstorm Warning | FSD | Hanson, Hutchinson | 45 min |
| Aug 31, 2:14 AM CDT | Severe Thunderstorm Warning | FSD | Bon Homme, Charles Mix | 31 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.