Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 84, NWS Aberdeen, SD

August 6, 20214 counties in South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 6, 2021, 11:29 PM CDT for 4 counties in South Dakota. It was in force for 46 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 6, 2021, 11:29 PM CDT (04:29 UTC)
Expired: Aug 7, 2021, 12:15 AM CDT
In force: 46 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Buffalo County, SD, Hand County, SD, Hyde County, SD, Lyman County, SD

The radar

The Aberdeen radar (KABR), 168 km from the middle of the area, began a volume at 04:32 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 6, 11:50 PM CDT	TSTM WND GST 73	1 Ne Stephan, SD	MESONET STATION 183 MAC''S CORNER (SDDOT).

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 6, 7:21 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 00:00Z, 4.5 hours before the alert went out and 116 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: 466 J/kg
Mixed-layer CIN: -132 J/kg
Mixed-layer LCL: 1480 m above ground
0-6 km bulk shear: 19 kt
0-1 km storm-relative helicity: 113 m²/s²
0-3 km storm-relative helicity: 173 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

361 
WUUS53 KABR 070429
SVRABR
SDC017-059-069-085-070515-
/O.NEW.KABR.SV.W.0084.210807T0429Z-210807T0515Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
1129 PM CDT Fri Aug 6 2021

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Southern Hand County in central South Dakota...
  Southeastern Hyde County in central South Dakota...
  Northeastern Lyman County in central South Dakota...
  Buffalo County in central South Dakota...

* Until 1215 AM CDT.

* At 1129 PM CDT, a severe thunderstorm was located over Tailrace Rec
  Area, or over Fort Thompson, moving northeast at 50 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Lees Corner around 1135 PM CDT.

Other locations in the path of this severe thunderstorm include
Miller Dale Colony, Ree Heights, Miller and St. Lawrence.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4400 9975 4411 9968 4410 9962 4411 9960
      4415 9961 4417 9965 4469 9934 4448 9870
      4420 9870 4419 9893 4394 9893 4393 9935
      4390 9936 4386 9931 4383 9933
TIME...MOT...LOC 0429Z 206DEG 43KT 4403 9942 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Mohr

2 follow-up statements

246 
WWUS53 KABR 070436
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
1136 PM CDT Fri Aug 6 2021

SDC017-059-069-085-070515-
/O.CON.KABR.SV.W.0084.000000T0000Z-210807T0515Z/
Hand SD-Hyde SD-Lyman SD-Buffalo SD-
1136 PM CDT Fri Aug 6 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT
FOR SOUTHERN HAND...SOUTHEASTERN HYDE...NORTHEASTERN LYMAN AND
BUFFALO COUNTIES...

At 1134 PM CDT, a severe thunderstorm was located over Lees Corner,
or near Fort Thompson, moving northeast at 50 mph.

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

SOURCE...Radar indicated. At 1115 pm cdt...Reliance weather station 
         reported a 71 mph wind.

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

Locations impacted include...
  Miller Dale Colony, Ree Heights, Miller and St. Lawrence.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4400 9975 4411 9968 4410 9962 4411 9960
      4415 9961 4417 9965 4469 9934 4448 9870
      4420 9870 4419 9893 4394 9893 4393 9935
      4390 9936 4386 9931 4383 9933
TIME...MOT...LOC 0434Z 206DEG 43KT 4409 9938 

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

$$

Mohr

995 
WWUS53 KABR 070506
SVSABR

Severe Weather Statement
National Weather Service Aberdeen SD
1206 AM CDT Sat Aug 7 2021

SDC017-059-069-085-070515-
/O.CON.KABR.SV.W.0084.000000T0000Z-210807T0515Z/
Hand SD-Hyde SD-Lyman SD-Buffalo SD-
1206 AM CDT Sat Aug 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1215 AM CDT
FOR SOUTHERN HAND...SOUTHEASTERN HYDE...NORTHEASTERN LYMAN AND
BUFFALO COUNTIES...

At 1204 AM CDT, a severe thunderstorm was located over Miller Dale
Colony, or 11 miles southwest of Miller, moving northeast at 50 mph.

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

SOURCE...Radar indicated. At 1150 pm cdt...A 73 mph wind was 
         measured 1 mile northeast Stephan.

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

Locations impacted include...
  Miller and St. Lawrence.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4410 9963 4411 9968 4410 9962 4411 9960
      4415 9961 4417 9965 4469 9934 4448 9870
      4420 9870 4419 9893 4394 9893 4393 9935
      4392 9944 4396 9952
TIME...MOT...LOC 0504Z 206DEG 43KT 4441 9916 

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

$$

Mohr

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 6, 9:49 PM CDT	Special Weather Statement	ABR	Jones, Stanley	41 min
Aug 6, 11:07 PM CDT	Severe Thunderstorm Warning	ABR	Buffalo, Lyman	38 min
Aug 7, 12:10 AM CDT	Severe Thunderstorm Warning Considerable damage threat	ABR	Faulk, Hand, Hyde, Spink	50 min
Aug 7, 4:35 AM CDT	Areal Flood Warning	ABR	Codington, Deuel	4 hr
Aug 7, 6:39 PM CDT	Severe Thunderstorm Warning	ABR	Brown, McPherson	51 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.