Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 159, NWS Aberdeen, SD

August 30, 2021Corson County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 30, 2021, 4:44 PM MDT for Corson County, South Dakota. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 30, 2021, 4:44 PM MDT (22:44 UTC)
Expired: Aug 30, 2021, 5:30 PM MDT
In force: 46 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

County Corson County, SD

The radar

The Bismarck radar (KBIS), 148 km from the middle of the area, began a volume at 22:47 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.

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 30, 3:03 PM MDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Bismarck Municip, ND (KBIS), launched 12:00Z, 10.7 hours before the alert went out and 150 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: 8 J/kg
Mixed-layer CIN: -262 J/kg
Mixed-layer LCL: 1949 m above ground
0-6 km bulk shear: 39 kt
0-1 km storm-relative helicity: 93 m²/s²
0-3 km storm-relative helicity: 131 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

461 
WUUS53 KABR 302244
SVRABR
SDC031-302330-
/O.NEW.KABR.SV.W.0159.210830T2244Z-210830T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
444 PM MDT Mon Aug 30 2021

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Southwestern Corson County in north central South Dakota...

* Until 530 PM MDT.

* At 444 PM MDT, a severe thunderstorm was located near Shambo Ranch,
  or 27 miles southeast of Lemmon, moving east at 30 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.

* This severe thunderstorm will remain over mainly rural areas of
  southwestern Corson County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4578 10200 4579 10151 4547 10156 4547 10200
TIME...MOT...LOC 2244Z 275DEG 24KT 4561 10184 

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

$$

TDK

2 follow-up statements

570 
WWUS53 KABR 302316
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
516 PM MDT Mon Aug 30 2021

SDC031-302330-
/O.CON.KABR.SV.W.0159.000000T0000Z-210830T2330Z/
Corson SD-
516 PM MDT Mon Aug 30 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 530 PM MDT
FOR SOUTHWESTERN CORSON COUNTY...

At 515 PM MDT, a severe thunderstorm was located near Shambo Ranch,
or 30 miles south of Lemmon, moving southeast 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.

Locations impacted include...
Shambo Ranch.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

Torrential rainfall is occurring with this storm, and may lead to
flash flooding. Do not drive your vehicle through flooded roadways.

&&

LAT...LON 4570 10200 4560 10173 4547 10162 4547 10200
TIME...MOT...LOC 2315Z 337DEG 13KT 4552 10194 

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

$$

SD

745 
WWUS53 KABR 302326
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
526 PM MDT Mon Aug 30 2021

SDC031-302334-
/O.EXP.KABR.SV.W.0159.000000T0000Z-210830T2330Z/
Corson SD-
526 PM MDT Mon Aug 30 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN CORSON COUNTY
WILL EXPIRE AT 530 PM MDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However small hail
and gusty winds are still possible with this thunderstorm.

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

LAT...LON 4570 10200 4560 10173 4547 10162 4547 10200
TIME...MOT...LOC 2324Z 275DEG 24KT 4551 10185 

$$

SD

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 30, 3:38 PM MDT	Special Weather Statement	ABR	Corson	37 min
Aug 30, 3:54 PM MDT	Severe Thunderstorm Warning	ABR	Corson	51 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.