Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021
Severe Thunderstorm Warning 104, NWS Sioux Falls, SD
NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 25, 2021, 3:39 PM CDT for Bon Homme County, Charles Mix County, South Dakota. It was in force for 36 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 25, 2021, 3:39 PM CDT (20:39 UTC)
- Expired
- Aug 25, 2021, 4:15 PM CDT
- In force
- 36 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
The radar
The Sioux Falls radar (KFSD), 132 km from the middle of the area, began a volume at 20:43 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 25, 4:01 PM CDT | HAIL 1.5 | Springfield, SD | SPOTTER REPORTED ONGOING HEAVY RAIN, STRONG WINDS, DIME SIZED HAIL WITH OCCASIONAL PING PONG SIZED HAIL. |
Local storm reports filed while the alert was in force, from inside its polygon or its counties.
The nearest sounding before it
Omaha, NE (KOAX), launched 12:00Z, 8.7 hours before the alert went out and 217 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
- 51 J/kg
- Mixed-layer CIN
- -542 J/kg
- Mixed-layer LCL
- 1604 m above ground
- 0-6 km bulk shear
- 28 kt
- 0-1 km storm-relative helicity
- 43 m²/s²
- 0-3 km storm-relative helicity
- 37 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
818
WUUS53 KFSD 252039
SVRFSD
SDC009-023-252115-
/O.NEW.KFSD.SV.W.0104.210825T2039Z-210825T2115Z/
BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
339 PM CDT Wed Aug 25 2021
The National Weather Service in Sioux Falls has issued a
* Severe Thunderstorm Warning for...
Southeastern Charles Mix County in south central South Dakota...
Southern Bon Homme County in southeastern South Dakota...
* Until 415 PM CDT.
* At 338 PM CDT, a severe thunderstorm was located 7 miles north of
Niobrara, or 13 miles southwest of Tyndall, moving east at 45 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...
Springfield around 350 PM CDT.
Other locations in the path of this severe thunderstorm include
Tabor.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4277 9806 4284 9815 4284 9818 4287 9825
4288 9831 4295 9831 4307 9765 4284 9765
4285 9777 4287 9785 4286 9787 4281 9789
4277 9794 4276 9803
TIME...MOT...LOC 2038Z 268DEG 39KT 4286 9807
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SG2 follow-up statements
873
WWUS53 KFSD 252106
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
406 PM CDT Wed Aug 25 2021
SDC023-252115-
/O.CAN.KFSD.SV.W.0104.000000T0000Z-210825T2115Z/
Charles Mix SD-
406 PM CDT Wed Aug 25 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN CHARLES MIX
COUNTY IS CANCELLED...
The severe thunderstorm which prompted the warning has moved out of
the warned area. Therefore, the warning has been cancelled.
LAT...LON 4277 9806 4284 9816 4285 9816 4288 9811
4291 9812 4294 9810 4299 9810 4307 9765
4284 9765 4285 9777 4287 9785 4286 9787
4281 9789 4278 9793 4276 9802
TIME...MOT...LOC 2105Z 275DEG 26KT 4283 9779
$$
SDC009-252115-
/O.CON.KFSD.SV.W.0104.000000T0000Z-210825T2115Z/
Bon Homme SD-
406 PM CDT Wed Aug 25 2021
...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 415 PM CDT
FOR SOUTHERN BON HOMME COUNTY...
At 405 PM CDT, a severe thunderstorm was located near Santee, or 11
miles south of Tyndall, moving east at 30 mph.
HAZARD...60 mph wind gusts and half dollar size hail.
SOURCE...Radar indicated. At 401 PM, ping-pong ball sized hail was
reported in Springfield by law enforcement.
IMPACT...Hail damage to vehicles is expected. Expect wind damage to
roofs, siding, and trees.
This severe thunderstorm will remain over mainly rural areas of
southern Bon Homme County.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
For your protection move to an interior room on the lowest floor of a
building.
&&
LAT...LON 4277 9806 4284 9816 4285 9816 4288 9811
4291 9812 4294 9810 4299 9810 4307 9765
4284 9765 4285 9777 4287 9785 4286 9787
4281 9789 4278 9793 4276 9802
TIME...MOT...LOC 2105Z 275DEG 26KT 4283 9779
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH
$$
SG035
WWUS53 KFSD 252113
SVSFSD
Severe Weather Statement
National Weather Service Sioux Falls SD
413 PM CDT Wed Aug 25 2021
SDC009-252122-
/O.EXP.KFSD.SV.W.0104.000000T0000Z-210825T2115Z/
Bon Homme SD-
413 PM CDT Wed Aug 25 2021
...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN BON HOMME COUNTY WILL
EXPIRE AT 415 PM CDT...
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire. However dime
sized hail and gusty winds to 50 mph are still possible with this
thunderstorm. Additional gusty winds to 50 mph may occur once the
storm has passed.
LAT...LON 4277 9806 4284 9816 4285 9816 4288 9811
4291 9812 4294 9810 4299 9810 4307 9765
4284 9765 4285 9777 4287 9785 4286 9787
4281 9789 4278 9793 4276 9802
TIME...MOT...LOC 2112Z 268DEG 39KT 4283 9774
$$
SGNearby
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.