Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 5, NWS Aberdeen, SD

May 23, 20218 counties in South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at May 23, 2021, 10:14 PM CDT for 8 counties in South Dakota. It was in force for 46 min. 3 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: May 23, 2021, 10:14 PM CDT (03:14 UTC)
Expired: May 23, 2021, 11:00 PM CDT
In force: 46 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Buffalo County, SD, Faulk County, SD, Hand County, SD, Hughes County, SD, Hyde County, SD, Lyman County, SD, Potter County, SD, Sully County, SD

The radar

The Aberdeen radar (KABR), 133 km from the middle of the area, began a volume at 03:16 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
May 23, 10:22 PM CDT	TSTM WND GST 64	1 Ene Harrold, SD	MESONET STATION 19 HARROLD (SDDOT).
May 23, 10:32 PM CDT	TSTM WND GST 59	1 Ne Stephan, SD	MESONET STATION 183 MAC''S CORNER (SDDOT).
May 23, 10:47 PM CDT	TSTM WND GST 60	17 W Polo, SD	MESONET STATION 215 JCT SD47/SD26 (SDDOT).

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, 3.2 hours before the alert went out and 104 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: 407 J/kg
Mixed-layer CIN: -5 J/kg
Mixed-layer LCL: 2081 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 97 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.5

Open this sounding in Storm Lab

The text

As transmitted.

151 
WUUS53 KABR 240314
SVRABR
SDC017-049-059-065-069-085-107-119-240400-
/O.NEW.KABR.SV.W.0005.210524T0314Z-210524T0400Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
1014 PM CDT Sun May 23 2021

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Southwestern Hand County in central South Dakota...
  Eastern Sully County in central South Dakota...
  Hyde County in central South Dakota...
  Southwestern Faulk County in north central South Dakota...
  Southeastern Potter County in north central South Dakota...
  Eastern Hughes County in central South Dakota...
  North central Lyman County in central South Dakota...
  Northwestern Buffalo County in central South Dakota...

* Until 1100 PM CDT.

* At 1013 PM CDT, severe thunderstorms were located along a line
  extending from near Agar to near Harrold to near West Bend Rec
  Area, moving northeast at 45 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Trained weather spotters. At 955 PM CDT, a 65 mph wind 
           gust was reported in Blunt.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* Severe thunderstorms will be near...
  Harrold around 1020 PM CDT.
  Holabird around 1025 PM CDT.
  Stephan around 1030 PM CDT.

Other locations in the path of these severe thunderstorms include
Stone Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

&&

LAT...LON 4509 9961 4471 9923 4419 9909 4419 9986
      4450 10000 4481 10030
TIME...MOT...LOC 0313Z 247DEG 40KT 4481 10010 4455 9985 4422 9970 

HAIL...<.75IN
WIND...70MPH
 
$$

SRF

1 follow-up statement

623 
WWUS53 KABR 240332
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
1032 PM CDT Sun May 23 2021

SDC017-049-059-065-069-085-107-119-240400-
/O.CON.KABR.SV.W.0005.000000T0000Z-210524T0400Z/
Hand SD-Sully SD-Hyde SD-Faulk SD-Potter SD-Hughes SD-Lyman SD-
Buffalo SD-
1032 PM CDT Sun May 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1100 PM CDT
FOR SOUTHWESTERN HAND...EASTERN SULLY...HYDE...SOUTHWESTERN FAULK...
SOUTHEASTERN POTTER...NORTHEASTERN HUGHES...NORTH CENTRAL LYMAN AND
NORTHWESTERN BUFFALO COUNTIES...

At 1031 PM CDT, severe thunderstorms were located along a line
extending from near Cottonwood Lake Near Agar to 6 miles north of
Holabird to near Stephan, moving northeast at 45 mph.

HAZARD...70 mph wind gusts.

SOURCE...Trained weather spotters. At 1022 PM CDT, a 64 mph wind 
         gust was reported near Harrold.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

These severe thunderstorms will remain over mainly rural areas of
southwestern Hand, eastern Sully, Hyde, southwestern Faulk,
southeastern Potter, northeastern Hughes, north central Lyman and
northwestern Buffalo Counties, including the following locations...
northern Crow Creek Reservation and Lower Brule Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Prepare immediately for damaging winds. People outside should move 
to a shelter, inside a strong building and away from windows.

&&

LAT...LON 4509 9961 4471 9923 4419 9909 4419 9977
      4452 9991 4485 10020
TIME...MOT...LOC 0331Z 247DEG 40KT 4488 9987 4462 9962 4429 9947 

HAIL...<.75IN
WIND...70MPH
 
$$

SRF

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 7:59 PM CDT	Severe Thunderstorm Warning	ABR	Dewey	46 min
May 23, 9:37 PM CDT	Special Weather Statement	ABR	Hughes	23 min
May 23, 10:04 PM CDT	Severe Thunderstorm Warning	ABR	Buffalo, Hughes, Lyman	41 min
May 23, 10:46 PM CDT	Severe Thunderstorm Warning	ABR	Buffalo, Faulk, Hand, Hyde, Potter, Sully	44 min
May 23, 11:06 PM CDT	Special Weather Statement	ABR	Edmunds, Walworth	24 min
May 23, 11:23 PM CDT	Special Weather Statement	ABR	Spink	37 min
May 23, 11:30 PM CDT	Severe Thunderstorm Warning	ABR	Campbell, Edmunds, Faulk, McPherson, Walworth	45 min
May 24, 12:03 AM CDT	Special Weather Statement	ABR	Brown	42 min
May 24, 12:11 AM CDT	Severe Thunderstorm Warning	ABR	Brown, Day, McPherson, Marshall, Spink	49 min
May 24, 12:14 AM CDT	Special Weather Statement	ABR	Clark, Day	46 min
May 24, 12:55 AM CDT	Special Weather Statement	ABR	Marshall	35 min
May 24, 1:00 AM CDT	Special Weather Statement	ABR	Codington, Deuel, Grant, Hamlin, Roberts	60 min
May 24, 1:17 AM CDT	Special Weather Statement	ABR	Roberts	43 min
May 24, 2:59 PM CDT	Wind Advisory	ABR	Brown, Campbell, Corson, Day, Dewey, Edmunds and 4 more	28 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.