Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 105, NWS Sioux Falls, SD

August 26, 2021Bon Homme County, Yankton County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 26, 2021, 4:58 AM CDT for Bon Homme County, Yankton County, South Dakota. It was in force for 27 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, 4:58 AM CDT (09:58 UTC)
Expired: Aug 26, 2021, 5:25 AM CDT
In force: 27 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Bon Homme County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 99 km from the middle of the area, began a volume at 10:02 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 nearest sounding before it

Omaha, NE (KOAX), launched 00:00Z, 10.0 hours before the alert went out and 193 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.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 1609 J/kg
Mixed-layer CIN: -78 J/kg
Mixed-layer LCL: 1502 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: -22 m²/s²
0-3 km storm-relative helicity: 66 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.7

Open this sounding in Storm Lab

The text

As transmitted.

286 
WUUS53 KFSD 260958
SVRFSD
SDC009-135-261045-
/O.NEW.KFSD.SV.W.0105.210826T0958Z-210826T1045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
458 AM CDT Thu Aug 26 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southeastern Bon Homme County in southeastern South Dakota...
  Southwestern Yankton County in southeastern South Dakota...

* Until 545 AM CDT.

* At 457 AM CDT, a severe thunderstorm was located near Lewis And
  Clark State Recreation Area, moving northeast at 25 mph.

  HAZARD...60 mph wind gusts and half dollar 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...
  Lewis And Clark State Recreation Area around 515 AM CDT.

Other locations in the path of this severe thunderstorm include
Utica, Yankton and Mission Hill.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4281 9721 4285 9723 4285 9729 4287 9730
      4285 9736 4287 9741 4285 9744 4286 9750
      4285 9758 4286 9762 4284 9769 4285 9776
      4288 9779 4311 9747 4280 9717
TIME...MOT...LOC 0957Z 241DEG 20KT 4285 9762 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JM

1 follow-up statement

916 
WWUS53 KFSD 261025
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
525 AM CDT Thu Aug 26 2021

SDC009-135-261035-
/O.CAN.KFSD.SV.W.0105.000000T0000Z-210826T1045Z/
Bon Homme SD-Yankton SD-
525 AM CDT Thu Aug 26 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN BON HOMME AND
SOUTHWESTERN YANKTON COUNTIES IS CANCELLED...
                
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 has been cancelled.

LAT...LON 4281 9721 4285 9723 4285 9729 4287 9730
      4285 9736 4287 9741 4285 9744 4286 9750
      4285 9758 4286 9762 4284 9769 4285 9776
      4288 9779 4311 9747 4280 9717
TIME...MOT...LOC 1020Z 241DEG 20KT 4293 9743 

$$

JM

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 26, 9:18 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Beadle, Kingsbury	57 min
Aug 26, 10:01 AM CDT	Severe Thunderstorm Warning	FSD	Brookings, Kingsbury, Lake, Miner, Moody	59 min
Aug 26, 10:39 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Brookings	66 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2021 Every 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.