Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 62, NWS Aberdeen, SD

July 23, 2021Brown County, McPherson County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Jul 23, 2021, 10:31 PM CDT for Brown County, McPherson County, South Dakota. It was in force for 44 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: Jul 23, 2021, 10:31 PM CDT (03:31 UTC)
Expired: Jul 23, 2021, 11:15 PM CDT
In force: 44 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 70.0 mph

Counties Brown County, SD, McPherson County, SD

The radar

The Aberdeen radar (KABR), 37 km from the middle of the area, began a volume at 03:33 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
Jul 23, 10:49 PM CDT	TSTM WND GST 56	10 E Spring Creek Colon, SD	ELM LAKE STATION.
Jul 23, 11:00 PM CDT	TSTM WND GST 56	7 Wsw Frederick, SD

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
Jul 23, 7:02 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 3.5 hours before the alert went out and 98 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: 3002 J/kg
Mixed-layer CIN: -46 J/kg
Mixed-layer LCL: 1613 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 53 m²/s²
0-3 km storm-relative helicity: 89 m²/s²
Significant tornado parameter: 0.4
Supercell composite: 6.9

Open this sounding in Storm Lab

The text

As transmitted.

199 
WUUS53 KABR 240331
SVRABR
SDC013-089-240415-
/O.NEW.KABR.SV.W.0062.210724T0331Z-210724T0415Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
1031 PM CDT Fri Jul 23 2021

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Northern Brown County in northeastern South Dakota...
  Northeastern McPherson County in north central South Dakota...

* Until 1115 PM CDT.

* At 1031 PM CDT, a severe thunderstorm was located near Spring Creek
  Colony, or 19 miles southwest of Ellendale, moving east at 45 mph.

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

  SOURCE...Trained weather spotters. At 1000 PM CDT, a 75 mph wind 
           gust was reported 10 miles WNW of Long Lake.

  IMPACT...Expect considerable tree damage. Damage is likely to 
           mobile homes, roofs, and outbuildings.

* This severe thunderstorm will be near...
  Elm Lake around 1040 PM CDT.

Other locations in the path of this severe thunderstorm include
Frederick, Barnard, Houghton and Sand Lake Wildlife Refuge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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 4560 9813 4583 9925 4594 9901 4593 9802
TIME...MOT...LOC 0331Z 287DEG 39KT 4584 9885 

HAIL...0.75IN
WIND...70MPH
 
$$

Lueck

1 follow-up statement

088 
WWUS53 KABR 240359
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
1059 PM CDT Fri Jul 23 2021

SDC013-089-240415-
/O.CON.KABR.SV.W.0062.000000T0000Z-210724T0415Z/
Brown SD-McPherson SD-
1059 PM CDT Fri Jul 23 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1115 PM CDT
FOR NORTHERN BROWN AND NORTHEASTERN MCPHERSON COUNTIES...

At 1059 PM CDT, a severe thunderstorm was located near Barnard, or 18
miles south of Ellendale, moving east at 45 mph.

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

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

Locations impacted include...
  Houghton and Sand Lake Wildlife Refuge.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4578 9899 4594 9879 4593 9802 4560 9813
TIME...MOT...LOC 0359Z 287DEG 39KT 4575 9843 

HAIL...0.75IN
WIND...70MPH
 
$$

Lueck

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 23, 8:14 PM CDT	Severe Thunderstorm Warning	ABR	Corson	46 min
Jul 23, 8:42 PM CDT	Special Weather Statement	ABR	Corson	33 min
Jul 23, 9:27 PM CDT	Special Weather Statement	ABR	Marshall	33 min
Jul 23, 9:47 PM CDT	Severe Thunderstorm Warning	ABR	Campbell, Edmunds, McPherson	43 min
Jul 23, 10:06 PM CDT	Special Weather Statement	ABR	Walworth	24 min
Jul 23, 10:29 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Edmunds, McPherson	46 min
Jul 23, 10:40 PM CDT	Special Weather Statement	ABR	Potter, Walworth	50 min
Jul 23, 10:42 PM CDT	Severe Thunderstorm Warning	ABR	Day, Marshall, Roberts	33 min
Jul 23, 10:54 PM CDT	Severe Thunderstorm Warning	ABR	Edmunds, Faulk, Potter, Sully, Walworth	51 min
Jul 23, 11:13 PM CDT	Severe Thunderstorm Warning	ABR	Roberts	35 min
Jul 23, 11:17 PM CDT	Severe Thunderstorm Warning	ABR	Brown, Marshall	30 min
Jul 23, 11:54 PM CDT	Special Weather Statement	ABR	Marshall	36 min
Jul 24, 12:43 AM CDT	Severe Thunderstorm Warning	ABR	Roberts	47 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.