Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 118, NWS Sioux Falls, SD

August 28, 2021Lincoln County, Turner County, Yankton County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 28, 2021, 3:56 PM CDT for Lincoln County, Turner County, Yankton County, South Dakota. It was in force for 49 min. 6 reports 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, 3:56 PM CDT (20:56 UTC)
Expired: Aug 28, 2021, 4:45 PM CDT
In force: 49 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Lincoln County, SD, Turner County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 44 km from the middle of the area, began a volume at 20:58 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, 4:07 PM CDT	TSTM WND GST 70	6 Wsw Hurley, SD	CORRECTS PREVIOUS TSTM WND GST REPORT FROM 6 WSW HURLEY. WINDS AROUND 70 MPH MAKING THE BACK OF HIS PICKUP TRUCK DANCE AROUND. HEAVY RAIN AND PEA SIZED HAIL TOO.
Aug 28, 4:07 PM CDT	TSTM WND GST 70	6 Wsw Hurley, SD	WINDS AROUND 70N MPH MAKING THE BACK OF HIS PICKUP TRUCK DANCE AROUND. HEAVY RAIN AND PEA SIZED HAIL TOO.
Aug 28, 4:15 PM CDT	HAIL 1	Hurley, SD	QUARTER SIZED HAIL.
Aug 28, 4:19 PM CDT	TSTM WND GST 70	Hurley, SD	WIND GUSTS 60-70 MPH.
Aug 28, 4:22 PM CDT	TORNADO	1 Wsw Lennox, SD	NWS STORM SURVEY FOUND AN EF1 TORNADO BEGAN JUST WEST OF TOWN OF LENNOX AND LIFTED JUST EAST OF TOWN. PATH LENGTH OF 1.89 MILES AND PATH WIDTH OF 400 YARDS. NO INJURIES OR FATALITIES REPORTED.
Aug 28, 4:24 PM CDT	TSTM WND GST 72	Lennox, SD	DELAYED REPORT. PERSONAL WEATHER STATION REPORTED GUST OF 72 MPH.

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, 8.9 hours before the alert went out and 213 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.

981 
WUUS53 KFSD 282056
SVRFSD
SDC083-125-135-282145-
/O.NEW.KFSD.SV.W.0118.210828T2056Z-210828T2145Z/

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

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Western Lincoln County in southeastern South Dakota...
  Northeastern Yankton County in southeastern South Dakota...
  Southern Turner County in southeastern South Dakota...

* Until 445 PM CDT.

* At 356 PM CDT, severe thunderstorms were located along a line
  extending from near Parker to near Mayfield, moving northeast at 35
  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.

* Severe thunderstorms will be near...
  Hurley around 400 PM CDT.
  Viborg and Chancellor around 410 PM CDT.
  Centerville around 420 PM CDT.
  Davis around 425 PM CDT.
  Lennox around 435 PM CDT.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4344 9680 4314 9681 4309 9721 4308 9736
      4335 9725
TIME...MOT...LOC 2056Z 237DEG 31KT 4334 9716 4311 9725 

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

$$

APT

1 follow-up statement

049 
WWUS53 KFSD 282109
SVSFSD

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

SDC083-125-135-282145-
/O.CON.KFSD.SV.W.0118.000000T0000Z-210828T2145Z/
Lincoln SD-Yankton SD-Turner SD-
409 PM CDT Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 445 PM CDT
FOR WESTERN LINCOLN...NORTHEASTERN YANKTON AND SOUTHERN TURNER
COUNTIES...

At 408 PM CDT, severe thunderstorms were located along a line
extending from near Chancellor to near Viborg, moving northeast at 40
mph.

HAZARD...Golf ball size hail and 70 mph wind gusts.

SOURCE...At 4:07 pm, trained weather spotter reported wind gusts to 
         70 mph 6 WSW of Hurley.

IMPACT...People and animals outdoors will be injured. Expect hail 
         damage to roofs, siding, windows, and vehicles. Expect 
         considerable tree damage. Wind damage is also likely to 
         mobile homes, roofs, and outbuildings.

These severe storms will be near...
  Chancellor around 415 PM CDT.

Other locations in the path of these severe thunderstorms include
Lennox.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4344 9680 4314 9681 4309 9721 4318 9730
      4335 9725
TIME...MOT...LOC 2108Z 236DEG 34KT 4340 9704 4317 9713 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.75 IN
WIND THREAT...OBSERVED
MAX WIND GUST...70 MPH

$$

APT

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 3:21 PM CDT	Severe Thunderstorm Warning	FSD	Lake, McCook, Miner, Minnehaha, Moody	24 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.