Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 98, NWS Sioux Falls, SD

August 22, 2021Hanson County, McCook County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 22, 2021, 8:32 PM CDT for Hanson County, McCook County, South Dakota. It was in force for 43 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 22, 2021, 8:32 PM CDT (01:32 UTC)
Expired: Aug 22, 2021, 9:15 PM CDT
In force: 43 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

Counties Hanson County, SD, McCook County, SD

The radar

The Sioux Falls radar (KFSD), 55 km from the middle of the area, began a volume at 01:33 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 watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Aug 22, 6:31 PM CDT	Tornado Watch	SPC	3 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 1.5 hours before the alert went out and 153 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: 166 J/kg
Mixed-layer CIN: -152 J/kg
Mixed-layer LCL: 1323 m above ground
0-6 km bulk shear: 56 kt
0-1 km storm-relative helicity: 245 m²/s²
0-3 km storm-relative helicity: 282 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

502 
WUUS53 KFSD 230132
SVRFSD
SDC061-087-230215-
/O.NEW.KFSD.SV.W.0098.210823T0132Z-210823T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
832 PM CDT Sun Aug 22 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  McCook County in southeastern South Dakota...
  Northeastern Hanson County in southeastern South Dakota...

* Until 915 PM CDT.

* At 832 PM CDT, a severe thunderstorm was located over Spencer In
  McCook County, or 20 miles east of Mitchell, moving east at 45 mph.

  HAZARD...Ping pong ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...People and animals outdoors will be injured. Expect hail 
           damage to roofs, siding, windows, and vehicles. Expect 
           wind damage to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Spencer In McCook County around 835 PM CDT.
  Salem around 850 PM CDT.

Other locations in the path of this severe thunderstorm include
Canistota, Montrose and Lake Vermillion State Recreation Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM CDT for southeastern
South Dakota.

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

A Tornado Watch remains in effect until 1000 PM CDT for southeastern
South Dakota.

&&

LAT...LON 4381 9713 4356 9713 4362 9778 4383 9778
TIME...MOT...LOC 0132Z 280DEG 40KT 4373 9763 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Schumacher

2 follow-up statements

001 
WWUS53 KFSD 230157
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
857 PM CDT Sun Aug 22 2021

SDC061-230206-
/O.CAN.KFSD.SV.W.0098.000000T0000Z-210823T0215Z/
Hanson SD-
857 PM CDT Sun Aug 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN HANSON COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1000 PM CDT for southeastern
South Dakota.

LAT...LON 4371 9713 4356 9713 4360 9761 4376 9757
TIME...MOT...LOC 0156Z 285DEG 24KT 4368 9745 

$$

SDC087-230215-
/O.CON.KFSD.SV.W.0098.000000T0000Z-210823T0215Z/
McCook SD-
857 PM CDT Sun Aug 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM CDT
FOR CENTRAL MCCOOK COUNTY...

At 856 PM CDT, a severe thunderstorm was located near Salem, or 14
miles northwest of Lake Vermillion State Recreation Area, moving east
at 30 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.

Locations impacted include...
  Salem, Canistota, Montrose and Lake Vermillion State Recreation 
  Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1000 PM CDT for southeastern
South Dakota.

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

&&

LAT...LON 4371 9713 4356 9713 4360 9761 4376 9757
TIME...MOT...LOC 0156Z 285DEG 24KT 4368 9745 

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

$$

Schumacher

918 
WWUS53 KFSD 230215
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
915 PM CDT Sun Aug 22 2021

SDC087-230225-
/O.EXP.KFSD.SV.W.0098.000000T0000Z-210823T0215Z/
McCook SD-
915 PM CDT Sun Aug 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL MCCOOK COUNTY HAS
EXPIRED...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning has
been allowed to expire.  However small hail is still possible with
this thunderstorm.

A Tornado Watch remains in effect until 1000 PM CDT for southeastern
South Dakota.

LAT...LON 4371 9713 4356 9713 4360 9761 4376 9757
TIME...MOT...LOC 0215Z 280DEG 40KT 4365 9720 

$$

Schumacher

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 7:15 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Davison, Hanson, Miner, Sanborn	30 min
Aug 22, 7:21 PM CDT	Severe Thunderstorm Warning	FSD	Aurora	24 min
Aug 22, 7:31 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Davison, Sanborn	44 min
Aug 22, 8:06 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Davison, Hanson, Miner, Sanborn	39 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.