Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 140, NWS Aberdeen, SD

August 28, 2021Dewey County, Walworth County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 28, 2021, 1:05 AM MDT for Dewey County, Walworth County, South Dakota. It was in force for 40 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 28, 2021, 1:05 AM MDT (07:05 UTC)
Expired
Aug 28, 2021, 1:45 AM MDT
In force
40 min
Issued by
NWS Aberdeen, SD
Area
Storm-based polygon
Hail
1.0 in
Wind
50.0 mph

Counties Dewey County, SD, Walworth County, SD

The radar

The Aberdeen radar (KABR), 136 km from the middle of the area, began a volume at 07:07 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

TimeReportWhereRemark
Aug 28, 1:32 AM MDTHAIL 2.55 N Lowry, SDNUMEROUS HAILSTONES UP TO TENNIS BALL SIZED AND DECREASED TO GOLF BALL SIZED BEFORE ENDING. GROUND WAS WHITE WITH HAIL.

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, 7.1 hours before the alert went out and 148 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-pSkew-T log-p diagram, Aberdeen, SD at 00:00Z on 2021-08-28Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 650 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Aberdeen, SD at 00:00Z on 2021-08-28The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 74 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
650 J/kg
Mixed-layer CIN
-128 J/kg
Mixed-layer LCL
1212 m above ground
0-6 km bulk shear
54 kt
0-1 km storm-relative helicity
74 m²/s²
0-3 km storm-relative helicity
186 m²/s²
Significant tornado parameter
0.2
Supercell composite
4.1

Open this sounding in Storm Lab

The text

As transmitted.

818 
WUUS53 KABR 280705
SVRABR
SDC041-129-280745-
/O.NEW.KABR.SV.W.0140.210828T0705Z-210828T0745Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
205 AM CDT Sat Aug 28 2021

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Northeastern Dewey County in north central South Dakota...
  Central Walworth County in north central South Dakota...

* Until 245 AM CDT/145 AM MDT/.

* At 205 AM CDT/105 AM MDT/, a severe thunderstorm was located over
  northeastern Lake Oahe, or 12 miles southeast of Mobridge, moving
  east at 30 mph.

  HAZARD...Quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will be near...
  Akaska around 220 AM CDT.

Other locations in the path of this severe thunderstorm include Selby
and Java.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4532 10038 4544 10040 4557 9984 4534 9974
TIME...MOT...LOC 0705Z 257DEG 24KT 4540 10030 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

Lueck
3 follow-up statements
415 
WWUS53 KABR 280713
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
213 AM CDT Sat Aug 28 2021

SDC041-280722-
/O.CAN.KABR.SV.W.0140.000000T0000Z-210828T0745Z/
Dewey SD-
213 AM CDT Sat Aug 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DEWEY 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 4532 10025 4547 10029 4557 9984 4534 9974
TIME...MOT...LOC 0712Z 257DEG 25KT 4540 10018 

$$

SDC129-280745-
/O.CON.KABR.SV.W.0140.000000T0000Z-210828T0745Z/
Walworth SD-
213 AM CDT Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 AM CDT
FOR CENTRAL WALWORTH COUNTY...

At 212 AM CDT, a severe thunderstorm was located near Akaska, or 10
miles southwest of Selby, moving east at 30 mph.

HAZARD...Half dollar size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

Locations impacted include...
  Selby and Java.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4532 10025 4547 10029 4557 9984 4534 9974
TIME...MOT...LOC 0712Z 257DEG 25KT 4540 10018 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

Lueck
628 
WWUS53 KABR 280720
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
220 AM CDT Sat Aug 28 2021

SDC129-280745-
/O.CON.KABR.SV.W.0140.000000T0000Z-210828T0745Z/
Walworth SD-
220 AM CDT Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 AM CDT
FOR EASTERN WALWORTH COUNTY...

At 220 AM CDT, a severe thunderstorm was located near Akaska, or 7
miles southwest of Selby, moving east at 30 mph.

HAZARD...Golf ball size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Java and Akaska. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 4532 10017 4546 10019 4554 9983 4534 9974
TIME...MOT...LOC 0720Z 257DEG 24KT 4541 10010 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

Lueck
928 
WWUS53 KABR 280727
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
227 AM CDT Sat Aug 28 2021

SDC129-280745-
/O.CON.KABR.SV.W.0140.000000T0000Z-210828T0745Z/
Walworth SD-
227 AM CDT Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 245 AM CDT
FOR EASTERN WALWORTH COUNTY...

At 227 AM CDT, a severe thunderstorm was located near Selby, moving
east at 30 mph.

HAZARD...Tennis ball size hail.

SOURCE...Radar indicated.

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

Locations impacted include...
Java.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 4532 10010 4547 10012 4554 9983 4534 9974
TIME...MOT...LOC 0727Z 257DEG 24KT 4542 10003 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

Lueck

The office that day

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

IssuedProductOfficeCountiesLasted
Aug 28, 12:14 AM MDTSevere Thunderstorm WarningABRCampbell, Corson, Dewey, Walworth31 min
Aug 28, 12:44 AM MDTSevere Thunderstorm WarningABRCampbell, Edmunds, McPherson, Walworth46 min
Aug 28, 1:39 AM MDTSevere Thunderstorm Warning Considerable damage threatABREdmunds, Walworth66 min
Aug 28, 1:49 AM MDTSpecial Weather StatementABRCorson26 min
Aug 28, 2:19 AM MDTSevere Thunderstorm WarningABRBrown, Edmunds, McPherson26 min
Aug 28, 2:36 AM MDTSpecial Weather StatementABRCampbell24 min
Aug 28, 2:42 AM MDTSevere Thunderstorm Warning Considerable damage threatABREdmunds47 min
Aug 28, 2:57 AM MDTSpecial Weather StatementABRCampbell33 min
Aug 28, 3:12 AM MDTSevere Thunderstorm Warning Considerable damage threatABRBrown, Spink63 min
Aug 28, 3:15 AM MDTSpecial Weather StatementABRCampbell30 min
Aug 28, 3:24 AM MDTSpecial Weather StatementABRWalworth36 min
Aug 28, 3:51 AM MDTSevere Thunderstorm WarningABRDewey39 min
Aug 28, 4:10 AM MDTSevere Thunderstorm Warning Considerable damage threatABRBrown, Clark, Codington, Day, Spink65 min
Aug 28, 4:29 AM MDTSpecial Weather StatementABRDewey16 min
Aug 28, 4:56 AM MDTSpecial Weather StatementABRWalworth34 min
Aug 28, 5:08 AM MDTSevere Thunderstorm WarningABREdmunds, Potter, Walworth37 min
Aug 28, 5:15 AM MDTSevere Thunderstorm Warning Considerable damage threatABRCodington, Day, Grant60 min
Aug 28, 5:40 AM MDTSpecial Weather StatementABRPotter35 min
Aug 28, 5:55 AM MDTSevere Thunderstorm WarningABREdmunds, Faulk35 min
Aug 28, 5:57 AM MDTSpecial Weather StatementABRBrown33 min
Aug 28, 6:01 AM MDTSevere Thunderstorm Warning Considerable damage threatABRGrant44 min
Aug 28, 6:09 AM MDTSevere Thunderstorm WarningABRBrown16 min
Aug 28, 6:24 AM MDTSevere Thunderstorm WarningABRBrown, Edmunds36 min
Aug 28, 6:43 AM MDTSevere Thunderstorm WarningABRGrant, Roberts30 min
Aug 28, 6:53 AM MDTSpecial Weather StatementABRBrown37 min
Aug 28, 7:24 AM MDTSpecial Weather StatementABRDay36 min
Aug 28, 7:26 AM MDTSevere Thunderstorm WarningABRDay, Grant, Roberts30 min
Aug 28, 7:27 AM MDTSpecial Weather StatementABRRoberts48 min
Aug 28, 7:42 AM MDTSevere Thunderstorm WarningABRCodington, Grant, Roberts33 min
Aug 28, 7:50 AM MDTTornado WarningABRGrant, Roberts25 min
Aug 28, 8:14 AM MDTSevere Thunderstorm WarningABRGrant, Roberts31 min
Aug 28, 8:31 AM MDTSevere Thunderstorm Warning Considerable damage threatABRGrant, Roberts44 min

Nearby

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.