Alert archive / South Dakota / Special Weather Statements in 2021

Special Weather Statement, NWS Aberdeen, SD

August 19, 2021Corson County, Dewey County, South Dakota

NWS Aberdeen, SD issued this special weather statement at Aug 19, 2021, 6:29 PM MDT for Corson County, Dewey County, South Dakota. It was in force for 61 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 19, 2021, 6:29 PM MDT (00:29 UTC)
Expired: Aug 19, 2021, 7:30 PM MDT
In force: 61 min
Issued by: NWS Aberdeen, SD
Hail: 0.00 in
Wind: 55

Counties Corson County, SD, Dewey County, SD

What was reported inside it

Time	Report	Where	Remark
Aug 19, 7:30 PM MDT	TSTM WND GST 56	10 S Bullhead, SD	GRAND RIVER RAWS. TIME ESTIMATED.

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

The nearest sounding before it

Rapid City, SD (KUNR), launched 00:00Z, 0.5 hours before the alert went out and 184 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: 1033 m above ground
0-6 km bulk shear: 41 kt
0-1 km storm-relative helicity: 28 m²/s²
0-3 km storm-relative helicity: 27 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

887 
WWUS83 KABR 200029
SPSABR

Special Weather Statement
National Weather Service Aberdeen SD
629 PM MDT Thu Aug 19 2021
 
SDZ003-015-033-200130-
Stanley SD-Dewey SD-Corson SD-
629 PM MDT Thu Aug 19 2021

...Strong thunderstorms will impact portions of central Corson,
northwestern Stanley and Dewey Counties through 730 PM MDT...

At 627 PM MDT, Doppler radar was tracking strong thunderstorms along
a line extending from 7 miles northeast of Thunder Butte to 7 miles
south of Mission Ridge. Movement was north at 30 mph.

HAZARD...Wind gusts of 50 to 60 mph.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects.

Locations impacted include...
Eagle Butte, Timber Lake, Isabel, Firesteel, South Eagle Butte,
Little Moreau Rec Area, White Horse, Mission Ridge, Green Grass,
Black Horse, Laplant, Parade, Ridgeview, Tiospaye Topa School, Spring
Lake, Promise, Klein Ranch, Glencross, Lake Oahe and Cheyenne River
Reservation.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

If on or near Cheyenne River, get out of the water and move indoors 
or inside a vehicle. Remember, lightning can strike out to 10 miles 
from the parent thunderstorm. If you can hear thunder, you are close 
enough to be struck by lightning. Move to safe shelter now! Do not 
be caught on the water in a thunderstorm.

&&

LAT...LON 4526 10043 4482 10068 4481 10072 4477 10071
      4451 10086 4478 10114 4499 10114 4499 10136
      4512 10149 4547 10147 4547 10162 4589 10150
TIME...MOT...LOC 0027Z 200DEG 27KT 4529 10158 4458 10085 

MAX HAIL SIZE...0.00 IN
MAX WIND GUST...55 MPH

$$

TDK

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 19, 7:26 PM MDT	Severe Thunderstorm Warning	ABR	Corson	34 min

Nearby

Special Weather Statements in South Dakota, 2021 Every special weather statement 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.