Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 62, NWS Sioux Falls, SD

July 23, 2021Kingsbury County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 23, 2021, 9:15 PM CDT for Kingsbury County, South Dakota. It was in force for 30 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: Jul 23, 2021, 9:15 PM CDT (02:15 UTC)
Expired: Jul 23, 2021, 9:45 PM CDT
In force: 30 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

County Kingsbury County, SD

The radar

The Sioux Falls radar (KFSD), 100 km from the middle of the area, began a volume at 02:19 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

Aberdeen, SD (KABR), launched 00:00Z, 2.3 hours before the alert went out and 98 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: 3002 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1613 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 6.9

Open this sounding in Storm Lab

The text

As transmitted.

901 
WUUS53 KFSD 240215
SVRFSD
SDC077-240245-
/O.NEW.KFSD.SV.W.0062.210724T0215Z-210724T0245Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
915 PM CDT Fri Jul 23 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southern Kingsbury County in east central South Dakota...

* Until 945 PM CDT.

* At 914 PM CDT, a severe thunderstorm was located near Lake Thompson
  State Recreation Area, moving east at 40 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Lake Thompson State Recreation Area around 920 PM CDT.
  Lake Preston around 930 PM CDT.
  Hetland around 940 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

If on or near Lake Henry or Lake Preston, 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 4424 9768 4433 9770 4441 9723 4427 9718
TIME...MOT...LOC 0214Z 264DEG 34KT 4431 9754 

HAIL...<.75IN
WIND...60MPH
 
$$

Chapman

2 follow-up statements

542 
WWUS53 KFSD 240231
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
931 PM CDT Fri Jul 23 2021

SDC077-240245-
/O.CON.KFSD.SV.W.0062.000000T0000Z-210724T0245Z/
Kingsbury SD-
931 PM CDT Fri Jul 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CDT
FOR CENTRAL KINGSBURY COUNTY...

At 929 PM CDT, a severe thunderstorm was located near Lake Preston,
or near Lake Thompson State Recreation Area, moving east at 40 mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

This severe storm will be near...
  Lake Preston around 935 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4428 9745 4433 9770 4441 9723 4430 9719
TIME...MOT...LOC 0229Z 264DEG 34KT 4433 9733 

HAIL...<.75IN
WIND...60MPH
 
$$

Chapman

446 
WWUS53 KFSD 240241
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
941 PM CDT Fri Jul 23 2021

SDC077-240250-
/O.EXP.KFSD.SV.W.0062.000000T0000Z-210724T0245Z/
Kingsbury SD-
941 PM CDT Fri Jul 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR CENTRAL KINGSBURY COUNTY WILL
EXPIRE AT 945 PM CDT...
                
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 will be allowed to expire.  However, gusty 
winds of 40 to 45 mph are still possible with this thunderstorm.

LAT...LON 4428 9745 4433 9770 4441 9723 4430 9719
TIME...MOT...LOC 0240Z 264DEG 34KT 4434 9720 

$$

Chapman

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 9:06 PM CDT	Severe Thunderstorm Warning	FSD	Kingsbury	39 min
Jul 23, 9:11 PM CDT	Severe Thunderstorm Warning	FSD	Aurora, Davison, Hanson	49 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.