Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 83, NWS Aberdeen, SD

August 6, 2021Buffalo County, Lyman County, South Dakota

NWS Aberdeen, SD issued this severe thunderstorm warning at Aug 6, 2021, 11:07 PM CDT for Buffalo County, Lyman County, South Dakota. It was in force for 38 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, 11:07 PM CDT (04:07 UTC)
Expired: Aug 6, 2021, 11:45 PM CDT
In force: 38 min
Issued by: NWS Aberdeen, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Buffalo County, SD, Lyman County, SD

The radar

The Aberdeen radar (KABR), 213 km from the middle of the area, began a volume at 04:10 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, 11:15 PM CDT	TSTM WND GST 71	3 Se Reliance, SD	MESONET STATION 54 RELIANCE (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, 4.1 hours before the alert went out and 161 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.

492 
WUUS53 KABR 070407
SVRABR
SDC017-085-070445-
/O.NEW.KABR.SV.W.0083.210807T0407Z-210807T0445Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Aberdeen SD
1107 PM CDT Fri Aug 6 2021

The National Weather Service in Aberdeen has issued a

* Severe Thunderstorm Warning for...
  Eastern Lyman County in central South Dakota...
  Southwestern Buffalo County in central South Dakota...

* Until 1145 PM CDT.

* At 1106 PM CDT, a severe thunderstorm was located 9 miles south of
  Lyman, or 17 miles west of Chamberlain, moving northeast at 30 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...
  Lyman around 1115 PM CDT.
  Lake Francis Case around 1120 PM CDT.
  Reliance around 1125 PM CDT.

Other locations in the path of this severe thunderstorm include
Oacoma, Dude Ranch and Medicine Butte.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4377 9965 4373 9967 4375 9968 4376 9968
      4376 9969 4372 9972 4374 9977 4371 9975
      4370 9986 4367 9987 4373 9998 4409 9966
      4393 9934 4393 9935 4386 9931 4378 9941
      4365 9945 4366 9940 4350 9959 4350 9963
TIME...MOT...LOC 0406Z 224DEG 26KT 4375 9968 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 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, 11:29 PM CDT	Severe Thunderstorm Warning	ABR	Buffalo, Hand, Hyde, Lyman	46 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.