Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 88, NWS Aberdeen, SD

August 7, 2021Brown County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 7, 2021, 7:26 PM CDT for Brown County, South Dakota. It was in force for 49 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 7, 2021, 7:26 PM CDT (00:26 UTC)
Expired: Aug 7, 2021, 8:15 PM CDT
In force: 49 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 50.0 mph

County Brown County, SD

The radar

The Aberdeen radar (KABR), 39 km from the middle of the area, began a volume at 00:29 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, 8:12 PM CDT	TSTM WND DMG	1 N Barnard, SD	COUPLE TREES DOWNED. EXTENSIVE CROP DAMAGE FROM WIND DRIVEN HAIL. PEA TO DIME SIZE HAIL WITH STRONG WINDS. 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, 0.4 hours before the alert went out and 100 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.

969 
WUUS53 KABR 080026
SVRABR
SDC013-080115-
/O.NEW.KABR.SV.W.0088.210808T0026Z-210808T0115Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
726 PM CDT Sat Aug 7 2021

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Northwestern Brown County in northeastern South Dakota...

* Until 815 PM CDT.

* At 726 PM CDT, a severe thunderstorm was located near Frederick, or
  14 miles south of Ellendale, moving east at 15 mph.

  HAZARD...Half dollar size hail.

  SOURCE...Radar indicated.

  IMPACT...Damage to vehicles is expected.

* This severe thunderstorm will be near...
  Barnard around 730 PM CDT.
  Frederick around 740 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4570 9855 4579 9865 4588 9866 4594 9847
      4578 9825
TIME...MOT...LOC 0026Z 251DEG 13KT 4580 9855 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 MPH

$$

Wise

1 follow-up statement

876 
WWUS53 KABR 080040
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
740 PM CDT Sat Aug 7 2021

SDC013-080115-
/O.CON.KABR.SV.W.0088.000000T0000Z-210808T0115Z/
Brown SD-
740 PM CDT Sat Aug 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR NORTHWESTERN BROWN COUNTY...

At 740 PM CDT, a severe thunderstorm was located over Frederick, or
13 miles south of Ellendale, moving east at 15 mph.

HAZARD...Quarter size hail.

SOURCE...Radar indicated.

IMPACT...Damage to vehicles is expected.

This severe thunderstorm will remain over mainly rural areas of
northwestern Brown County.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4570 9855 4579 9865 4588 9866 4594 9847
      4578 9825
TIME...MOT...LOC 0040Z 251DEG 13KT 4582 9848 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...<50 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, 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, 10:53 PM CDT	Special Weather Statement	ABR	Spink	37 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

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.