Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 3, NWS Aberdeen, SD

May 23, 2021Dewey County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at May 23, 2021, 6:59 PM MDT for Dewey County, South Dakota. It was in force for 46 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: May 23, 2021, 6:59 PM MDT (00:59 UTC)
Expired: May 23, 2021, 7:45 PM MDT
In force: 46 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

County Dewey County, SD

The radar

The Rapid City radar (KUDX), 163 km from the middle of the area, began a volume at 01:03 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, 7:15 PM MDT	TSTM WND GST 60	4 Nw Lantry, SD	BEAR CREEK RAWS. TIME ESTIMATED.

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
May 23, 1:50 PM MDT	Tornado Watch	SPC	7 hr

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 1.0 hours before the alert went out and 170 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1290 m above ground
0-6 km bulk shear: 67 kt
0-1 km storm-relative helicity: -292 m²/s²
0-3 km storm-relative helicity: -171 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

755 
WUUS53 KABR 240059
SVRABR
SDC041-240145-
/O.NEW.KABR.SV.W.0003.210524T0059Z-210524T0145Z/

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

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Northwestern Dewey County in north central South Dakota...

* Until 745 PM MDT.

* At 658 PM MDT, severe thunderstorms were located along a line
  extending from 8 miles northwest of Iron Lightning to near Red Elm
  to 8 miles west of Cherry Creek, moving northeast at 35 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Radar indicated.

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

* Locations impacted include...
  Eagle Butte and Isabel.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM MDT for north central
South Dakota.

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

&&

LAT...LON 4504 10148 4538 10149 4539 10147 4547 10147
      4547 10124 4494 10110 4492 10113 4499 10114
      4499 10115 4500 10150 4503 10150
TIME...MOT...LOC 0058Z 219DEG 32KT 4528 10194 4504 10186 4458 10166 

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

Serr

2 follow-up statements

985 
WWUS53 KABR 240132
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
732 PM MDT Sun May 23 2021

SDC041-240145-
/O.CON.KABR.SV.W.0003.000000T0000Z-210524T0145Z/
Dewey SD-
732 PM MDT Sun May 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM MDT
FOR NORTHWESTERN DEWEY COUNTY...

At 731 PM MDT, severe thunderstorms were located along a line
extending from 8 miles east of Shambo Ranch to 7 miles southeast of
Isabel to 13 miles northwest of Mission Ridge, moving north at 45
mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

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

Locations impacted include...
Eagle Butte, Lantry, Isabel, Firesteel, Green Grass, Bear Creek and
Cheyenne River Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM MDT for north central
South Dakota.

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

&&

LAT...LON 4504 10148 4538 10149 4539 10147 4547 10147
      4547 10124 4494 10110 4492 10113 4499 10114
      4499 10115 4500 10150 4503 10150
TIME...MOT...LOC 0131Z 183DEG 41KT 4553 10166 4531 10133 4486 10094 

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

Serr

912 
WWUS53 KABR 240140
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
740 PM MDT Sun May 23 2021

SDC041-240149-
/O.EXP.KABR.SV.W.0003.000000T0000Z-210524T0145Z/
Dewey SD-
740 PM MDT Sun May 23 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN DEWEY COUNTY WILL
EXPIRE AT 745 PM MDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

A Tornado Watch remains in effect until 900 PM MDT for north central
South Dakota.

LAT...LON 4504 10148 4538 10149 4539 10147 4547 10147
      4547 10124 4494 10110 4492 10113 4499 10114
      4499 10115 4500 10150 4503 10150
TIME...MOT...LOC 0139Z 219DEG 32KT 4559 10159 4537 10126 4492 10087 

$$

Serr

The office that day

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

Issued	Product	Office	Counties	Lasted
May 23, 8:37 PM MDT	Special Weather Statement	ABR	Hughes	23 min
May 23, 9:04 PM MDT	Severe Thunderstorm Warning	ABR	Buffalo, Hughes, Lyman	41 min
May 23, 9:14 PM MDT	Severe Thunderstorm Warning	ABR	Buffalo, Faulk, Hand, Hughes, Hyde, Lyman and 2 more	46 min
May 23, 9:46 PM MDT	Severe Thunderstorm Warning	ABR	Buffalo, Faulk, Hand, Hyde, Potter, Sully	44 min
May 23, 10:06 PM MDT	Special Weather Statement	ABR	Edmunds, Walworth	24 min
May 23, 10:23 PM MDT	Special Weather Statement	ABR	Spink	37 min
May 23, 10:30 PM MDT	Severe Thunderstorm Warning	ABR	Campbell, Edmunds, Faulk, McPherson, Walworth	45 min
May 23, 11:03 PM MDT	Special Weather Statement	ABR	Brown	42 min
May 23, 11:11 PM MDT	Severe Thunderstorm Warning	ABR	Brown, Day, McPherson, Marshall, Spink	49 min
May 23, 11:14 PM MDT	Special Weather Statement	ABR	Clark, Day	46 min
May 23, 11:55 PM MDT	Special Weather Statement	ABR	Marshall	35 min
May 24, 12:00 AM MDT	Special Weather Statement	ABR	Codington, Deuel, Grant, Hamlin, Roberts	60 min
May 24, 12:17 AM MDT	Special Weather Statement	ABR	Roberts	43 min
May 24, 1:59 PM MDT	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.