Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 131, NWS Sioux Falls, SD

August 28, 2021Lincoln County, Minnehaha County, South Dakota; Lyon County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 28, 2021, 6:44 PM CDT for Lincoln County, Minnehaha County, South Dakota; Lyon County, Iowa. It was in force for 46 min. 5 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, 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: 1.25 in
Wind: 60.0 mph

Counties Lyon County, IA, Lincoln County, SD, Minnehaha County, SD

The radar

The Sioux Falls radar (KFSD), 35 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.

What was reported inside it

Time	Report	Where	Remark
Aug 28, 6:52 PM CDT	HAIL 1.25	5 Wsw Canton, SD	PICTURE VIA SOCIAL MEDIA.
Aug 28, 6:55 PM CDT	HAIL 1	1 W Harrisburg, SD	REPORT FROM MPING: QUARTER (1.00 IN.).
Aug 28, 6:55 PM CDT	HAIL 1	Harrisburg, SD	REPORT FROM MPING: QUARTER (1.00 IN.).
Aug 28, 7:16 PM CDT	HAIL 1	2 Ne Canton, SD	A FEW QUARTERS, MOSTLY NICKEL.
Aug 28, 7:35 PM CDT	HAIL 1	5 Ssw Larchwood, IA	MOSTLY PEA-SIZED HAIL FOR ABOUT 5 MINUTES, LARGEST HAIL STONES WERE QUARTER SIZED.

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 28, 3:57 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 11.7 hours before the alert went out and 219 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: 929 J/kg
Mixed-layer CIN: -277 J/kg
Mixed-layer LCL: 1419 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 36 m²/s²
0-3 km storm-relative helicity: 98 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.7

Open this sounding in Storm Lab

The text

As transmitted.

488 
WUUS53 KFSD 282344 RRA
SVRFSD
IAC119-SDC083-099-290030-
/O.NEW.KFSD.SV.W.0131.210828T2344Z-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...
  Western Lyon County in northwestern Iowa...
  South central Minnehaha County in southeastern South Dakota...
  Central Lincoln County in southeastern South Dakota...

* Until 730 PM CDT.

* At 643 PM CDT, a severe thunderstorm was located just south of 
  Worthing, or 7 miles west of Canton, moving northeast at 25 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 thunderstorm will be near...
  Newton Hills State Park around 655 PM CDT.

Other locations in the path of this severe thunderstorm include
Canton, Lake Alvin State Recreation Area, Inwood, Larchwood and
Lester.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4324 9691 4355 9666 4339 9622 4326 9651
      4326 9655 4325 9655 4324 9657 4323 9657
      4316 9673
TIME...MOT...LOC 2343Z 232DEG 21KT 4328 9672 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kalin

1 follow-up statement

671 
WWUS53 KFSD 282356
SVSFSD

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

IAC119-SDC083-099-290030-
/O.CON.KFSD.SV.W.0131.000000T0000Z-210829T0030Z/
Lyon IA-Minnehaha SD-Lincoln SD-
656 PM CDT Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 730 PM CDT
FOR WESTERN LYON...SOUTH CENTRAL MINNEHAHA AND CENTRAL LINCOLN
COUNTIES...

At 656 PM CDT, a severe thunderstorm was located near Canton, moving
northeast at 25 mph.

HAZARD...Golf 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.

Locations impacted include...
  Canton, Inwood, Lake Alvin State Recreation Area, Larchwood and 
  Lester.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4324 9691 4355 9666 4339 9622 4326 9651
      4326 9655 4325 9655 4324 9657 4323 9657
      4316 9673
TIME...MOT...LOC 2356Z 223DEG 22KT 4329 9667 

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

$$

Kalin

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	Davison, Hanson, Lake, McCook, Miner, Sanborn	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
Aug 28, 5:26 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Lyon, Osceola	34 min
Aug 28, 5:29 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Lyon, Osceola	31 min
Aug 28, 5:34 PM CDT	Severe Thunderstorm Warning	FSD	Lyon	17 min

Nearby

Severe Thunderstorm Warnings in South Dakota, 2021 Severe Thunderstorm Warnings in Iowa, 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.