Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 130, NWS Sioux Falls, SD

August 28, 20216 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 28, 2021, 6:44 PM CDT for 6 counties in South Dakota. It was in force for 46 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 28, 2021, 6:44 PM CDT (23:44 UTC)
Expired: Aug 28, 2021, 7:30 PM CDT
In force: 46 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Davison County, SD, Hanson County, SD, Lake County, SD, McCook County, SD, Miner County, SD, Sanborn County, SD

The radar

The Sioux Falls radar (KFSD), 71 km from the middle of the area, began a volume at 23:49 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.

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 28, 3:44 PM CDT	Tornado Watch	SPC	5 hr
Aug 28, 3:57 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.7 hours before the alert went out and 131 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: 9 J/kg
Mixed-layer CIN: -334 J/kg
Mixed-layer LCL: 1540 m above ground
0-6 km bulk shear: 61 kt
0-1 km storm-relative helicity: 25 m²/s²
0-3 km storm-relative helicity: 558 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.9

Open this sounding in Storm Lab

The text

As transmitted.

485 
WUUS53 KFSD 282344
SVRFSD
SDC035-061-079-087-097-111-290030-
/O.NEW.KFSD.SV.W.0130.210828T2344Z-210829T0030Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
644 PM CDT Sat Aug 28 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Northeastern Davison County in southeastern South Dakota...
  Southeastern Sanborn County in east central South Dakota...
  Southwestern Lake County in east central South Dakota...
  Miner County in east central South Dakota...
  Northwestern McCook County in southeastern South Dakota...
  Hanson County in southeastern South Dakota...

* Until 730 PM CDT.

* At 642 PM CDT, a cluster of severe thunderstorms were located near 
  Farmer, or 15 miles east of Mitchell, moving northeast at 40 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.

* These severe thunderstorms will be near... 
  Canova around 700 PM CDT.
  Vilas around 705 PM CDT.
  Howard around 710 PM CDT.
  Winfred around 715 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for east central
South Dakota.

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

A Tornado Watch remains in effect until 900 PM CDT for east central
South Dakota.

&&

LAT...LON 4390 9707 4352 9782 4380 9811 4420 9745
      4419 9741
TIME...MOT...LOC 2342Z 225DEG 36KT 4379 9773 

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

$$

SG

1 follow-up statement

101 
WWUS53 KFSD 290003
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
703 PM CDT Sat Aug 28 2021

SDC035-290012-
/O.CAN.KFSD.SV.W.0130.000000T0000Z-210829T0030Z/
Davison SD-
703 PM CDT Sat Aug 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN DAVISON COUNTY IS
CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 900 PM CDT for east central
South Dakota.

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

LAT...LON 4359 9768 4390 9794 4420 9745 4419 9741
      4390 9707
TIME...MOT...LOC 0002Z 230DEG 37KT 4392 9748 

$$

SDC061-079-087-097-111-290030-
/O.CON.KFSD.SV.W.0130.000000T0000Z-210829T0030Z/
Sanborn SD-Lake SD-Miner SD-McCook SD-Hanson SD-
703 PM CDT Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR SOUTHEASTERN SANBORN...SOUTHWESTERN LAKE...MINER...NORTHWESTERN
MCCOOK AND NORTHEASTERN HANSON COUNTIES...

At 702 PM CDT, a severe thunderstorm was located over Canova, or 16
miles west of Lake Herman State Park, moving northeast at 45 mph.

HAZARD...Golf ball size hail and 60 mph wind gusts.

SOURCE...Trained weather spotters. At 658 PM golf ball sized hail 
         was reported in Salem.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect wind 
         damage to roofs, siding, and trees.

This severe storm will be near...
  Winfred around 715 PM CDT.
  Lake Herman State Park around 725 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 900 PM CDT for east central
South Dakota.

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

&&

LAT...LON 4359 9768 4390 9794 4420 9745 4419 9741
      4390 9707
TIME...MOT...LOC 0002Z 230DEG 37KT 4392 9748 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

SG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 3:21 PM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook, Miner, Minnehaha, Moody	24 min
Aug 28, 3:56 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Turner, Yankton	49 min
Aug 28, 4:23 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Lincoln, Turner	37 min
Aug 28, 4:23 PM CDT	Tornado Warning	FSD	Lincoln, Turner	37 min
Aug 28, 4:33 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	42 min
Aug 28, 4:39 PM CDT	Tornado Warning Tornado observed	FSD	Lincoln	36 min
Aug 28, 4:45 PM CDT	Tornado Warning	FSD	Lincoln, Minnehaha	30 min
Aug 28, 5:00 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Lincoln, Minnehaha	45 min
Aug 28, 6:14 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, Lake, McCook	31 min
Aug 28, 6:15 PM CDT	Severe Thunderstorm Warning	FSD	Minnehaha, Moody	45 min
Aug 28, 6:17 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, McCook, Turner	43 min
Aug 28, 6:44 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	46 min
Aug 28, 6:48 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, Lake, McCook, Minnehaha	42 min
Aug 28, 6:53 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	52 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.