Alert archive / South Dakota / Special Weather Statements in 2021

Special Weather Statement, NWS Aberdeen, SD

August 7, 2021Spink County, South Dakota

NWS Aberdeen, SD issued this special weather statement at Aug 7, 2021, 10:53 PM CDT for Spink County, South Dakota. It was in force for 37 min. 2 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: Aug 7, 2021, 10:53 PM CDT (03:53 UTC)
Expired: Aug 7, 2021, 11:30 PM CDT
In force: 37 min
Issued by: NWS Aberdeen, SD
Hail: 0.75 in
Wind: 40

County Spink County, SD

The radar

The Aberdeen radar (KABR), 29 km from the middle of the area, began a volume at 03:56 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 7, 11:26 PM CDT	HAIL 1	2 S Verdon, SD
Aug 7, 11:34 PM CDT	HAIL 1	2 Ne Conde, SD	TIME ESTIMATED.

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, 3.9 hours before the alert went out and 39 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: 2053 J/kg
Mixed-layer CIN: -13 J/kg
Mixed-layer LCL: 1417 m above ground
0-6 km bulk shear: 34 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 86 m²/s²
Significant tornado parameter: 0.3
Supercell composite: 4.0

Open this sounding in Storm Lab

The text

As transmitted.

029 
WWUS83 KABR 080353
SPSABR

Special Weather Statement
National Weather Service Aberdeen SD
1053 PM CDT Sat Aug 7 2021
 
SDZ006-018-080430-
Spink SD-Brown SD-
1053 PM CDT Sat Aug 7 2021

...A strong thunderstorm will impact portions of southeastern Brown
and northeastern Spink Counties through 1130 PM CDT...

At 1053 PM CDT, Doppler radar was tracking a strong thunderstorm near
Verdon, or 15 miles south of Groton, moving east at 10 mph.

HAZARD...Winds in excess of 40 mph and penny size hail.

SOURCE...Radar indicated.

IMPACT...Gusty winds could knock down tree limbs and blow around 
         unsecured objects. Minor damage to outdoor objects is 
         possible.

Locations impacted include...
  Ferney, Verdon and Conde.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

If outdoors, consider seeking shelter inside a building. 

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

&&

LAT...LON 4519 9838 4534 9833 4533 9798 4510 9809
TIME...MOT...LOC 0353Z 278DEG 10KT 4523 9820 

MAX HAIL SIZE...0.75 IN
MAX WIND GUST...40 MPH

$$

Wise

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 7, 7:05 PM CDT	Severe Thunderstorm Warning	ABR	Brown, McPherson	40 min
Aug 7, 7:26 PM CDT	Severe Thunderstorm Warning	ABR	Brown	49 min
Aug 7, 8:09 PM CDT	Special Weather Statement	ABR	Brown	36 min
Aug 7, 8:18 PM CDT	Special Weather Statement	ABR	Brown	27 min
Aug 7, 9:07 PM CDT	Special Weather Statement	ABR	Brown	23 min
Aug 7, 10:09 PM CDT	Special Weather Statement	ABR	Brown	36 min
Aug 7, 11:01 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Spink	44 min
Aug 7, 11:25 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Clark, Day, Spink	50 min
Aug 8, 12:56 AM CDT	Severe Thunderstorm Warning	ABR	Clark	49 min
Aug 8, 3:37 AM CDT	Areal Flood Warning	ABR	Clark, Day	5 hr
Aug 8, 5:02 AM CDT	Areal Flood Warning	ABR	Clark, Codington, Grant	4 hr

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; radar from the NEXRAD Level II archive.