Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 94, NWS Aberdeen, SD

August 14, 2021Dewey County, Potter County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 14, 2021, 7:15 PM MDT for Dewey County, Potter County, South Dakota. It was in force for 60 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 14, 2021, 7:15 PM MDT (01:15 UTC)
Expired: Aug 14, 2021, 8:15 PM MDT
In force: 60 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Dewey County, SD, Potter County, SD

The radar

The Aberdeen radar (KABR), 170 km from the middle of the area, began a volume at 01:15 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 14, 7:40 PM MDT	HAIL 1.5	5 Ese Laplant, SD

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, 1.3 hours before the alert went out and 168 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: 831 J/kg
Mixed-layer CIN: -81 J/kg
Mixed-layer LCL: 2191 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 397 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.1

Open this sounding in Storm Lab

The text

As transmitted.

033 
WUUS53 KABR 150115
SVRABR
SDC041-107-150215-
/O.NEW.KABR.SV.W.0094.210815T0115Z-210815T0215Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
815 PM CDT Sat Aug 14 2021

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Southwestern Potter County in north central South Dakota...
  Southeastern Dewey County in north central South Dakota...

* Until 915 PM CDT/815 PM MDT/.

* At 814 PM CDT/714 PM MDT/, a severe thunderstorm was located near
  Swiftbird Day School, or 27 miles west of Gettysburg, moving south
  at 15 mph.

  HAZARD...60 mph wind gusts and half dollar 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...
  Swiftbird Day School around 730 PM MDT.

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

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4520 10064 4521 10037 4490 10025 4490 10069
TIME...MOT...LOC 0114Z 359DEG 15KT 4514 10050 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Mohr

2 follow-up statements

415 
WWUS53 KABR 150155
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
855 PM CDT Sat Aug 14 2021

SDC041-107-150215-
/O.CON.KABR.SV.W.0094.000000T0000Z-210815T0215Z/
Potter SD-Dewey SD-
855 PM CDT Sat Aug 14 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 915 PM
CDT/815 PM MDT/ FOR SOUTHWESTERN POTTER AND SOUTHEASTERN DEWEY
COUNTIES...

At 854 PM CDT/754 PM MDT/, a severe thunderstorm was located near
Lake Oahe, or 26 miles west of Gettysburg, moving south at 15 mph.

HAZARD...Ping pong ball size hail and 60 mph wind gusts.

SOURCE...Public.

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.

This severe thunderstorm will remain over mainly rural areas of
southwestern Potter and southeastern Dewey Counties.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4513 10064 4514 10036 4490 10025 4490 10069
TIME...MOT...LOC 0154Z 358DEG 12KT 4500 10049 

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

$$

Mohr

972 
WWUS53 KABR 150211
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
911 PM CDT Sat Aug 14 2021

SDC041-107-150220-
/O.EXP.KABR.SV.W.0094.000000T0000Z-210815T0215Z/
Potter SD-Dewey SD-
911 PM CDT Sat Aug 14 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN POTTER AND
SOUTHEASTERN DEWEY COUNTIES WILL EXPIRE AT 915 PM CDT/815 PM MDT/...
                
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 will be allowed to expire.

LAT...LON 4513 10064 4514 10036 4490 10025 4490 10069
TIME...MOT...LOC 0210Z 359DEG 15KT 4494 10049 

$$

Mohr

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 14, 6:29 PM MDT	Severe Thunderstorm Warning	ABR	Dewey, Potter	46 min
Aug 14, 7:48 PM MDT	Severe Thunderstorm Warning	ABR	Dewey, Stanley, Sully	42 min
Aug 14, 8:28 PM MDT	Special Weather Statement	ABR	Dewey	32 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.