Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 136, NWS Sioux Falls, SD

August 28, 20216 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 28, 2021, 7:25 PM CDT for 6 counties in South Dakota. It was in force for 50 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, 7:25 PM CDT (00:25 UTC)
Expired: Aug 28, 2021, 8:15 PM CDT
In force: 50 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.75 in
Wind: 60.0 mph

Counties Hanson County, SD, Lake County, SD, McCook County, SD, Miner County, SD, Minnehaha County, SD, Moody County, SD

The radar

The Sioux Falls radar (KFSD), 45 km from the middle of the area, began a volume at 00:28 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 00:00Z, 0.4 hours before the alert went out and 156 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: 143 J/kg
Mixed-layer CIN: -122 J/kg
Mixed-layer LCL: 1242 m above ground
0-6 km bulk shear: 71 kt
0-1 km storm-relative helicity: -15 m²/s²
0-3 km storm-relative helicity: 268 m²/s²
Significant tornado parameter: -0.0
Supercell composite: -0.2

Open this sounding in Storm Lab

The text

As transmitted.

281 
WUUS53 KFSD 290025
SVRFSD
SDC061-079-087-097-099-101-290115-
/O.NEW.KFSD.SV.W.0136.210829T0025Z-210829T0115Z/

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

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southwestern Moody County in east central South Dakota...
  Lake County in east central South Dakota...
  Northwestern Minnehaha County in southeastern South Dakota...
  Southeastern Miner County in east central South Dakota...
  McCook County in southeastern South Dakota...
  Eastern Hanson County in southeastern South Dakota...

* Until 815 PM CDT.

* At 725 PM CDT, a severe thunderstorm was located over Salem, or 12
  miles northwest of Lake Vermillion State Recreation Area, moving
  northeast at 45 mph.

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

  SOURCE...Public.

  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 thunderstorm will be near...
  Montrose around 730 PM CDT.
  Orland around 745 PM CDT.
  Lake Herman State Park around 750 PM CDT.
  Madison and Chester around 755 PM CDT.
  Wentworth around 800 PM CDT.
  Colman around 810 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 4354 9736 4365 9765 4417 9706 4394 9673
TIME...MOT...LOC 0025Z 227DEG 37KT 4374 9733 

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

$$

SG

1 follow-up statement

340 
WWUS53 KFSD 290052 RRA
SVSFSD

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

SDC061-097-290102-
/O.CAN.KFSD.SV.W.0136.000000T0000Z-210829T0115Z/
Miner SD-Hanson SD-
752 PM CDT Sat Aug 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN MINER AND EASTERN
HANSON COUNTIES 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 4394 9673 4354 9736 4367 9760 4385 9741
      4385 9737 4389 9737 4417 9706
TIME...MOT...LOC 0052Z 220DEG 49KT 4373 9724 

$$

SDC079-087-099-101-290115-
/O.CON.KFSD.SV.W.0136.000000T0000Z-210829T0115Z/
Moody SD-Lake SD-Minnehaha SD-McCook SD-
752 PM CDT Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 815 PM CDT
FOR SOUTHWESTERN MOODY...LAKE...NORTHWESTERN MINNEHAHA AND CENTRAL
MCCOOK COUNTIES...

At 752 PM CDT, a severe thunderstorm was located near Montrose, or 10
miles north of Lake Vermillion State Recreation Area, moving
northeast at 55 mph.

HAZARD...60 mph wind gusts and half dollar size hail.

SOURCE...Radar indicated.

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

This severe storm will be near...
  Orland around 805 PM CDT.
  Chester around 810 PM CDT.
  Madison and Wentworth around 815 PM CDT.
  Colman around 820 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 4394 9673 4354 9736 4367 9760 4385 9741
      4385 9737 4389 9737 4417 9706
TIME...MOT...LOC 0052Z 220DEG 49KT 4373 9724 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 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, 7:23 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Lincoln	52 min
Aug 28, 7:27 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Hutchinson, Turner, Yankton	48 min
Aug 28, 7:48 PM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook, Minnehaha, Moody, Turner	31 min
Aug 28, 7:50 PM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Clay, Hutchinson, Lincoln, Turner, Yankton	40 min
Aug 28, 8:52 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln, Minnehaha	23 min
Aug 28, 9:13 PM CDT	Severe Thunderstorm Warning	FSD	Lincoln	47 min
Aug 28, 9:20 PM CDT	Flash Flood Warning	FSD	Lincoln, Minnehaha	85 min
Aug 28, 9:29 PM CDT	Flash Flood Warning	FSD	Lincoln, Minnehaha	3 hr
Aug 28, 10:36 PM CDT	Flash Flood Warning	FSD	Lincoln, Minnehaha	114 min
Aug 28, 11:46 PM CDT	River Flood Warning	FSD	Lincoln, Minnehaha	8 hr
Aug 29, 7:44 AM CDT	River Flood Warning	FSD	Lincoln	15 hr

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.