Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 117, NWS Sioux Falls, SD

August 28, 20215 counties in South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 28, 2021, 3:21 PM CDT for 5 counties in South Dakota. It was in force for 24 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 28, 2021, 3:21 PM CDT (20:21 UTC)
Expired: Aug 28, 2021, 3:45 PM CDT
In force: 24 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.5 in
Wind: 60.0 mph

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

The radar

The Sioux Falls radar (KFSD), 49 km from the middle of the area, began a volume at 20:25 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 28, 3:32 PM CDT	HAIL 1	6 Sw Orland, SD	HAIL MOSTLY DIME TO NICKEL SIZED, BUT SOME AS BIG AS QUARTERS. ALSO HEAVY RAIN.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 8.4 hours before the alert went out and 150 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.

997 
WUUS53 KFSD 282021
SVRFSD
SDC079-087-097-099-101-282045-
/O.NEW.KFSD.SV.W.0117.210828T2021Z-210828T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
321 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...
  Southern Lake County in east central South Dakota...
  Northwestern Minnehaha County in southeastern South Dakota...
  Southeastern Miner County in east central South Dakota...
  Northeastern McCook County in southeastern South Dakota...

* Until 345 PM CDT.

* At 320 PM CDT, a severe thunderstorm was located 7 miles north of
  Salem, or 13 miles southwest of Lake Herman State Park, moving east
  at 45 mph.

  HAZARD...Ping pong ball size hail and 60 mph wind gusts.

  SOURCE...Radar indicated.

  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...
  Orland around 330 PM CDT.
  Wentworth and Chester around 345 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4371 9744 4391 9752 4410 9695 4375 9682
TIME...MOT...LOC 2020Z 251DEG 41KT 4383 9733 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

APT

2 follow-up statements

455 
WWUS53 KFSD 282030
SVSFSD

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

SDC079-087-097-099-101-282045-
/O.CON.KFSD.SV.W.0117.000000T0000Z-210828T2045Z/
Moody SD-Lake SD-Minnehaha SD-Miner SD-McCook SD-
330 PM CDT Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM CDT
FOR SOUTHWESTERN MOODY...SOUTHERN LAKE...NORTHWESTERN MINNEHAHA...
SOUTHEASTERN MINER AND NORTHEASTERN MCCOOK COUNTIES...

At 329 PM CDT, a severe thunderstorm was located near Orland, or 10
miles southwest of Lake Herman State Park, moving east at 30 mph.

HAZARD...Two inch hail and 60 mph wind gusts.

SOURCE...Radar indicated.

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...
  Orland around 340 PM CDT.

Other locations in the path of this severe thunderstorm include Lake
Herman State Park, Madison, Wentworth and Chester.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

This storm is producing large hail. SEEK SHELTER NOW inside a sturdy
structure and stay away from windows.

&&

LAT...LON 4371 9744 4392 9748 4410 9695 4375 9682
TIME...MOT...LOC 2029Z 247DEG 26KT 4386 9727 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...2.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

APT

000 
WWUS53 KFSD 282044
SVSFSD

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

SDC079-087-097-099-101-282054-
/O.EXP.KFSD.SV.W.0117.000000T0000Z-210828T2045Z/
Moody SD-Lake SD-Minnehaha SD-Miner SD-McCook SD-
344 PM CDT Sat Aug 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHWESTERN MOODY...SOUTHERN
LAKE...NORTHWESTERN MINNEHAHA...SOUTHEASTERN MINER AND NORTHEASTERN
MCCOOK COUNTIES WILL EXPIRE AT 345 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small hail
and gusty winds are still possible with this thunderstorm.

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

LAT...LON 4371 9744 4392 9748 4410 9695 4375 9682
TIME...MOT...LOC 2044Z 251DEG 41KT 4391 9708 

$$

APT

The office that day

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

Issued	Product	Office	Counties	Lasted
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	Davison, Hanson, Lake, McCook, Miner, Sanborn	46 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.