Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 155, NWS Aberdeen, SD

August 28, 2021Codington County, Grant County, Roberts County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 28, 2021, 8:42 AM CDT for Codington County, Grant County, Roberts County, South Dakota. It was in force for 33 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, 8:42 AM CDT (13:42 UTC)
Expired: Aug 28, 2021, 9:15 AM CDT
In force: 33 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Codington County, SD, Grant County, SD, Roberts County, SD

The radar

The Aberdeen radar (KABR), 109 km from the middle of the area, began a volume at 13:44 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 28, 8:44 AM CDT	TSTM WND GST 65	7 Ssw Summit, SD

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

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 28, 7:08 AM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 1.7 hours before the alert went out and 112 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: 9 J/kg
Mixed-layer CIN: -334 J/kg
Mixed-layer LCL: 1540 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 558 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

640 
WUUS53 KABR 281342
SVRABR
SDC029-051-109-281415-
/O.NEW.KABR.SV.W.0155.210828T1342Z-210828T1415Z/

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

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  South central Roberts County in northeastern South Dakota...
  Northwestern Grant County in northeastern South Dakota...
  Northern Codington County in northeastern South Dakota...

* Until 915 AM CDT.

* At 842 AM CDT, a severe thunderstorm was located near Summit, or 21
  miles east of Webster, moving northeast at 45 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...
  Summit around 850 AM CDT.
  Marvin around 855 AM CDT.

Other locations in the path of this severe thunderstorm include
Wilmot and Corona.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4514 9709 4515 9721 4518 9723 4526 9723
      4545 9684 4531 9665
TIME...MOT...LOC 1342Z 234DEG 40KT 4522 9712 

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

$$

Lueck

1 follow-up statement

722 
WWUS53 KABR 281356
SVSABR

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

SDC029-281406-
/O.CAN.KABR.SV.W.0155.000000T0000Z-210828T1415Z/
Codington SD-
856 AM CDT Sat Aug 28 2021

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

A Severe Thunderstorm Watch remains in effect until noon CDT for
northeastern South Dakota.

LAT...LON 4515 9706 4531 9712 4545 9684 4531 9665
TIME...MOT...LOC 1356Z 234DEG 40KT 4531 9694 

$$

SDC051-109-281415-
/O.CON.KABR.SV.W.0155.000000T0000Z-210828T1415Z/
Roberts SD-Grant SD-
856 AM CDT Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 AM CDT
FOR SOUTH CENTRAL ROBERTS AND NORTHWESTERN GRANT COUNTIES...

At 856 AM CDT, a severe thunderstorm was located near Marvin, or 16
miles northwest of Milbank, moving northeast 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.

Locations impacted include...
  Wilmot and Corona.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4515 9706 4531 9712 4545 9684 4531 9665
TIME...MOT...LOC 1356Z 234DEG 40KT 4531 9694 

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

$$

Lueck

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 1:14 AM CDT	Severe Thunderstorm Warning	ABR	Campbell, Corson, Dewey, Walworth	31 min
Aug 28, 1:44 AM CDT	Severe Thunderstorm Warning	ABR	Campbell, Edmunds, McPherson, Walworth	46 min
Aug 28, 2:05 AM CDT	Severe Thunderstorm Warning	ABR	Dewey, Walworth	40 min
Aug 28, 2:39 AM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Edmunds, Walworth	66 min
Aug 28, 2:49 AM CDT	Special Weather Statement	ABR	Corson	26 min
Aug 28, 3:19 AM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, McPherson	26 min
Aug 28, 3:36 AM CDT	Special Weather Statement	ABR	Campbell	24 min
Aug 28, 3:42 AM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Edmunds	47 min
Aug 28, 3:57 AM CDT	Special Weather Statement	ABR	Campbell	33 min
Aug 28, 4:12 AM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Brown, Spink	63 min
Aug 28, 4:15 AM CDT	Special Weather Statement	ABR	Campbell	30 min
Aug 28, 4:24 AM CDT	Special Weather Statement	ABR	Walworth	36 min
Aug 28, 4:51 AM CDT	Severe Thunderstorm Warning	ABR	Dewey	39 min
Aug 28, 5:10 AM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Brown, Clark, Codington, Day, Spink	65 min
Aug 28, 5:29 AM CDT	Special Weather Statement	ABR	Dewey	16 min
Aug 28, 5:56 AM CDT	Special Weather Statement	ABR	Walworth	34 min
Aug 28, 6:08 AM CDT	Severe Thunderstorm Warning	ABR	Edmunds, Potter, Walworth	37 min
Aug 28, 6:15 AM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Codington, Day, Grant	60 min
Aug 28, 6:40 AM CDT	Special Weather Statement	ABR	Potter	35 min
Aug 28, 6:55 AM CDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk	35 min
Aug 28, 6:57 AM CDT	Special Weather Statement	ABR	Brown	33 min
Aug 28, 7:01 AM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Grant	44 min
Aug 28, 7:09 AM CDT	Severe Thunderstorm Warning	ABR	Brown	16 min
Aug 28, 7:24 AM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds	36 min
Aug 28, 7:43 AM CDT	Severe Thunderstorm Warning	ABR	Grant, Roberts	30 min
Aug 28, 7:53 AM CDT	Special Weather Statement	ABR	Brown	37 min
Aug 28, 8:24 AM CDT	Special Weather Statement	ABR	Day	36 min
Aug 28, 8:26 AM CDT	Severe Thunderstorm Warning	ABR	Day, Grant, Roberts	30 min
Aug 28, 8:27 AM CDT	Special Weather Statement	ABR	Roberts	48 min
Aug 28, 8:50 AM CDT	Tornado Warning	ABR	Grant, Roberts	25 min
Aug 28, 9:14 AM CDT	Severe Thunderstorm Warning	ABR	Grant, Roberts	31 min
Aug 28, 9:31 AM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Grant, Roberts	44 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.