Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 90, NWS Aberdeen, SD

August 7, 20214 counties in South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 7, 2021, 11:25 PM CDT for 4 counties in South Dakota. It was in force for 50 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 7, 2021, 11:25 PM CDT (04:25 UTC)
Expired: Aug 8, 2021, 12:15 AM CDT
In force: 50 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Brown County, SD, Clark County, SD, Day County, SD, Spink County, SD

The radar

The Aberdeen radar (KABR), 38 km from the middle of the area, began a volume at 04:29 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 7, 11:26 PM CDT	HAIL 1	2 S Verdon, SD
Aug 7, 11:34 PM CDT	HAIL 1	2 Ne Conde, SD	TIME ESTIMATED.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 4.4 hours before the alert went out and 32 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: 2053 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1417 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.0

Open this sounding in Storm Lab

The text

As transmitted.

662 
WUUS53 KABR 080425
SVRABR
SDC013-025-037-115-080515-
/O.NEW.KABR.SV.W.0090.210808T0425Z-210808T0515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
1125 PM CDT Sat Aug 7 2021

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Southwestern Day County in northeastern South Dakota...
  South central Brown County in northeastern South Dakota...
  Northwestern Clark County in northeastern South Dakota...
  Northeastern Spink County in northeastern South Dakota...

* Until 1215 AM CDT.

* At 1125 PM CDT, a severe thunderstorm was located over Conde, or 20
  miles south of Groton, moving southeast at 20 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...
  Crandall around 1135 PM CDT.

Other locations in the path of this severe thunderstorm include
Crocker.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4517 9849 4531 9837 4514 9769 4495 9792
TIME...MOT...LOC 0425Z 307DEG 17KT 4515 9804 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Wise

2 follow-up statements

913 
WWUS53 KABR 080447
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
1147 PM CDT Sat Aug 7 2021

SDC013-080456-
/O.CAN.KABR.SV.W.0090.000000T0000Z-210808T0515Z/
Brown SD-
1147 PM CDT Sat Aug 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTH CENTRAL BROWN 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 4514 9769 4495 9792 4513 9838 4524 9821
      4524 9811
TIME...MOT...LOC 0446Z 307DEG 17KT 4509 9792 

$$

SDC025-037-115-080515-
/O.CON.KABR.SV.W.0090.000000T0000Z-210808T0515Z/
Day SD-Clark SD-Spink SD-
1147 PM CDT Sat Aug 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT
FOR SOUTHWESTERN DAY...NORTHWESTERN CLARK AND NORTHEASTERN SPINK
COUNTIES...

At 1146 PM CDT, a severe thunderstorm was located near Crandall, or
16 miles northwest of Clark, moving southeast at 20 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.

Locations impacted include...
  Crocker.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4514 9769 4495 9792 4513 9838 4524 9821
      4524 9811
TIME...MOT...LOC 0446Z 307DEG 17KT 4509 9792 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Wise

765 
WWUS53 KABR 080516
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
1216 AM CDT Sun Aug 8 2021

SDC025-037-115-080526-
/O.EXP.KABR.SV.W.0090.000000T0000Z-210808T0515Z/
Day SD-Clark SD-Spink SD-
1216 AM CDT Sun Aug 8 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN DAY...
NORTHWESTERN CLARK AND NORTHEASTERN SPINK COUNTIES HAS EXPIRED...
                
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 allowed to expire.  However gusty
winds are still possible with this thunderstorm.

LAT...LON 4514 9769 4495 9792 4513 9838 4524 9821
      4524 9811
TIME...MOT...LOC 0516Z 307DEG 17KT 4501 9776 

$$

Wise

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 7:05 PM CDT	Severe Thunderstorm Warning	ABR	Brown, McPherson	40 min
Aug 7, 7:26 PM CDT	Severe Thunderstorm Warning	ABR	Brown	49 min
Aug 7, 8:09 PM CDT	Special Weather Statement	ABR	Brown	36 min
Aug 7, 8:18 PM CDT	Special Weather Statement	ABR	Brown	27 min
Aug 7, 9:07 PM CDT	Special Weather Statement	ABR	Brown	23 min
Aug 7, 10:09 PM CDT	Special Weather Statement	ABR	Brown	36 min
Aug 7, 10:53 PM CDT	Special Weather Statement	ABR	Spink	37 min
Aug 7, 11:01 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Spink	44 min
Aug 8, 12:56 AM CDT	Severe Thunderstorm Warning	ABR	Clark	49 min
Aug 8, 3:37 AM CDT	Areal Flood Warning	ABR	Clark, Day	5 hr
Aug 8, 5:02 AM CDT	Areal Flood Warning	ABR	Clark, Codington, Grant	4 hr

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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.