Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 102, NWS Aberdeen, SD

August 22, 2021Brown County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 22, 2021, 5:40 PM CDT for Brown County, South Dakota. It was in force for 50 min. 6 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 22, 2021, 5:40 PM CDT (22:40 UTC)
Expired: Aug 22, 2021, 6:30 PM CDT
In force: 50 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Tornado: Possible
Damage threat: Considerable
Hail: 1.0 in
Wind: 70.0 mph

County Brown County, SD

The radar

The Aberdeen radar (KABR), 22 km from the middle of the area, began a volume at 22:41 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 22, 5:44 PM CDT	TSTM WND GST 79	3 N Aberdeen, SD
Aug 22, 5:45 PM CDT	TSTM WND DMG	Richmond Lake Rec Area, SD	LEANING POWER POLLS, LARGE BRANCHES DOWN.
Aug 22, 5:57 PM CDT	TSTM WND DMG	Columbia, SD	LARGE TREES DOWN, MAJOR CROP DAMAGE.
Aug 22, 5:57 PM CDT	HAIL 0.88	Columbia, SD
Aug 22, 6:00 PM CDT	TSTM WND DMG	Columbia, SD	6 TO 7 INCH BRANCHES DOWNED.
Aug 22, 6:15 PM CDT	TSTM WND DMG	1 Ene Aberdeen, SD	POWER LINES DOWN NEAR INTERSECTION OF 8TH AVE N AND N ROOSEVELT ROAD. REPORT RELAYED VIA SOCIAL MEDIA.

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

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 22, 3:36 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 10.7 hours before the alert went out and 80 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: 1388 m above ground
0-6 km bulk shear: 33 kt
0-1 km storm-relative helicity: 135 m²/s²
0-3 km storm-relative helicity: 261 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

470 
WUUS53 KABR 222240
SVRABR
SDC013-222330-
/O.NEW.KABR.SV.W.0102.210822T2240Z-210822T2330Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
540 PM CDT Sun Aug 22 2021

The National Weather Service in Aberdeen has issued a

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

* Until 630 PM CDT.

* At 539 PM CDT, a severe thunderstorm was located near Aberdeen,
  moving east at 45 mph.

  HAZARD...70 mph wind gusts and quarter size hail.

  SOURCE...Trained weather spotters. At 530 PM CDT, a 74 mph wind 
           gust was reported at Mina Lake.

  IMPACT...Hail damage to vehicles is expected. Expect considerable 
           tree damage. Wind damage is also likely to mobile homes, 
           roofs, and outbuildings.

* This severe thunderstorm will be near...
  Aberdeen around 545 PM CDT.
  Bath around 555 PM CDT.

Other locations in the path of this severe thunderstorm include
Columbia, Tacoma Park, Putney, Groton and Claremont.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Remain alert for a possible tornado! Tornadoes can develop quickly
from severe thunderstorms. If you spot a tornado go at once into the
basement or small central room in a sturdy structure.

Prepare immediately for large hail and damaging winds. People outside
should move immediately to shelter inside a strong building. Stay
away from windows.

&&

LAT...LON 4571 9798 4545 9798 4539 9867 4559 9870
      4577 9799
TIME...MOT...LOC 2239Z 257DEG 38KT 4548 9856 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

Lueck

3 follow-up statements

621 
WWUS53 KABR 222259
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
559 PM CDT Sun Aug 22 2021

SDC013-222330-
/O.CON.KABR.SV.W.0102.000000T0000Z-210822T2330Z/
Brown SD-
559 PM CDT Sun Aug 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR EAST CENTRAL BROWN COUNTY...

At 558 PM CDT, a severe thunderstorm was located over Tacoma Park, or
9 miles northwest of Groton, moving east at 45 mph.

THIS IS A DESTRUCTIVE STORM FOR PORTIONS OF EAST CENTRAL BROWN 
COUNTY.

HAZARD...80 mph wind gusts and quarter size hail.

SOURCE...Emergency management. At 545 PM, a 79 mph wind gust was 
         reported 3 miles north of Aberdeen.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be heavily damaged. Expect 
         considerable damage to roofs, windows, and vehicles. 
         Extensive tree damage and power outages are likely.

Locations impacted include...
  Claremont.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4571 9798 4545 9798 4541 9842 4552 9840
      4564 9849 4577 9799
TIME...MOT...LOC 2258Z 254DEG 40KT 4555 9823 

THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...OBSERVED
MAX HAIL SIZE...1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...80 MPH

$$

Lueck

125 
WWUS53 KABR 222317
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
617 PM CDT Sun Aug 22 2021

SDC013-222330-
/O.CON.KABR.SV.W.0102.000000T0000Z-210822T2330Z/
Brown SD-
617 PM CDT Sun Aug 22 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 630 PM CDT
FOR EAST CENTRAL BROWN COUNTY...

At 617 PM CDT, a severe thunderstorm was located near Langford, or 12
miles northeast of Groton, moving east at 45 mph.

THIS IS A DESTRUCTIVE STORM FOR PORTIONS OF EAST CENTRAL BROWN 
COUNTY.

HAZARD...80 mph wind gusts and quarter size hail.

SOURCE...Emergency management.

IMPACT...Flying debris will be dangerous to those caught without 
         shelter. Mobile homes will be heavily damaged. Expect 
         considerable damage to roofs, windows, and vehicles. 
         Extensive tree damage and power outages are likely.

Locations impacted include...
Claremont.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4551 9798 4550 9808 4560 9807 4570 9811
      4574 9799 4571 9798
TIME...MOT...LOC 2317Z 257DEG 38KT 4560 9795 

THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...OBSERVED
MAX WIND GUST...80 MPH

$$

Lueck

693 
WWUS53 KABR 222329
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
629 PM CDT Sun Aug 22 2021

SDC013-222338-
/O.EXP.KABR.SV.W.0102.000000T0000Z-210822T2330Z/
Brown SD-
629 PM CDT Sun Aug 22 2021

...THE SEVERE THUNDERSTORM WARNING FOR EAST CENTRAL BROWN COUNTY WILL
EXPIRE AT 630 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 900 PM CDT for
northeastern South Dakota.

Remember, a Severe Thunderstorm Warning still remains in effect for
portions of southern Brown County.

LAT...LON 4551 9798 4550 9808 4560 9807 4570 9811
      4574 9799 4571 9798
TIME...MOT...LOC 2328Z 257DEG 38KT 4562 9781 

$$

Lueck

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 22, 8:02 AM CDT	Special Weather Statement	ABR	Jones	43 min
Aug 22, 3:40 PM CDT	Special Weather Statement	ABR	Deuel	20 min
Aug 22, 4:19 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk, Potter	41 min
Aug 22, 4:33 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Edmunds, McPherson	42 min
Aug 22, 5:03 PM CDT	Severe Thunderstorm Warning	ABR	McPherson	13 min
Aug 22, 5:21 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds	39 min
Aug 22, 5:25 PM CDT	Severe Thunderstorm Warning	ABR	Buffalo	37 min
Aug 22, 5:50 PM CDT	Special Weather Statement	ABR	Edmunds	25 min
Aug 22, 6:11 PM CDT	Severe Thunderstorm Warning	ABR	Brown	49 min
Aug 22, 6:14 PM CDT	Severe Thunderstorm Warning Destructive damage threat	ABR	Day, Marshall	46 min
Aug 22, 6:27 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Spink	48 min
Aug 22, 6:54 PM CDT	Tornado Warning	ABR	Spink	15 min
Aug 22, 6:57 PM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Day, Marshall, Roberts	24 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.