Alert archive / South Dakota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 40, NWS Sioux Falls, SD

July 5, 20214 counties in South Dakota; Rock County, Minnesota; Lyon County, Iowa

NWS Sioux Falls, SD issued this severe thunderstorm warning at Jul 5, 2021, 6:37 PM CDT for 4 counties in South Dakota; Rock County, Minnesota; Lyon County, Iowa. It was in force for 38 min. 7 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: Jul 5, 2021, 6:37 PM CDT (23:37 UTC)
Expired: Jul 5, 2021, 7:15 PM CDT
In force: 38 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 0.75 in
Wind: 60.0 mph

Counties Lyon County, IA, Rock County, MN, Lake County, SD, Lincoln County, SD, Minnehaha County, SD, Turner County, SD

The radar

The Sioux Falls radar (KFSD), 12 km from the middle of the area, began a volume at 23:38 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
Jul 5, 6:40 PM CDT	TSTM WND DMG	5 W Sioux Falls, SD	REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF.
Jul 5, 6:54 PM CDT	TSTM WND GST 65	3 W Sioux Falls, SD
Jul 5, 6:55 PM CDT	TSTM WND DMG	2 W Sioux Falls, SD	LARGE PORTION OF THE RUBBER ROOFING DAMAGED AT THE EXPO BUILDING ON THE W.H. LYON FAIRGROUNDS. TIME ESTIMATED FROM RADAR.
Jul 5, 6:55 PM CDT	TSTM WND DMG	3 S Sioux Falls, SD	REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF.
Jul 5, 6:56 PM CDT	TSTM WND DMG	5 Nne Sioux Falls, SD	TRAILER TIPPED OVER NEAR I-90 MILE MARKER 401 BY WIND GUSTS. NO INJURIES REPORTED.
Jul 5, 6:57 PM CDT	TSTM WND DMG	1 Ese Sioux Falls, SD	REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF.
Jul 5, 6:57 PM CDT	TSTM WND DMG	1 Ne Sioux Falls, SD	REPORT FROM MPING: 1-INCH TREE LIMBS BROKEN; SHINGLES BLOWN OFF.

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, 11.6 hours before the alert went out and 198 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: 0 J/kg
Mixed-layer CIN: No buoyant parcel
Mixed-layer LCL: 1844 m above ground
0-6 km bulk shear: 20 kt
0-1 km storm-relative helicity: -42 m²/s²
0-3 km storm-relative helicity: 14 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

566 
WUUS53 KFSD 052337
SVRFSD
IAC119-MNC133-SDC079-083-099-125-060015-
/O.NEW.KFSD.SV.W.0040.210705T2337Z-210706T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
637 PM CDT Mon Jul 5 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Lyon County in northwestern Iowa...
  Rock County in southwestern Minnesota...
  Southeastern Lake County in east central South Dakota...
  Minnehaha County in southeastern South Dakota...
  Northern Lincoln County in southeastern South Dakota...
  Northeastern Turner County in southeastern South Dakota...

* Until 715 PM CDT.

* At 637 PM CDT, severe thunderstorms were located along a line
  extending from near Dell Rapids to near Sioux Falls to near Brandon
  to near Lennox, moving east at 40 mph.

  HAZARD...60 mph wind gusts and penny size hail.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Severe thunderstorms will be near...
  Brandon and Rowena around 645 PM CDT.
  Lake Alvin State Recreation Area and Palisades State Park around 
  650 PM CDT.
  Canton and Valley Springs around 655 PM CDT.
  Garretson, Hills, Beaver Creek and Sherman around 700 PM CDT.
  Larchwood, Inwood and Jasper around 705 PM CDT.
  Luverne and Lester around 710 PM CDT.
  Rock Rapids, Hardwick, Alvord and Blue Mounds State Park around 
  715 PM CDT.

Other locations impacted by these severe thunderstorms include
Magnolia, Kenneth and Steen.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4388 9689 4385 9689 4385 9605 4350 9606
      4350 9596 4329 9614 4331 9718 4363 9698
      4384 9712
TIME...MOT...LOC 2337Z 265DEG 35KT 4382 9680 4361 9666 4358 9666 4338
9682

HAIL...0.75IN
WIND...60MPH
 
$$

JM

1 follow-up statement

067 
WWUS53 KFSD 052352
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
652 PM CDT Mon Jul 5 2021

SDC079-125-060001-
/O.CAN.KFSD.SV.W.0040.000000T0000Z-210706T0015Z/
Lake SD-Turner SD-
652 PM CDT Mon Jul 5 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHEASTERN LAKE AND
NORTHEASTERN TURNER COUNTIES IS CANCELLED...

The storms which prompted the warning has moved out of the warned 
area. Therefore, the warning has been cancelled.

LAT...LON 4384 9687 4385 9689 4385 9605 4350 9606
      4350 9596 4329 9614 4331 9691 4359 9684
      4384 9690
TIME...MOT...LOC 2351Z 265DEG 35KT 4383 9664 4362 9650 4359 9650 4339
9666

$$

IAC119-MNC133-SDC083-099-060015-
/O.CON.KFSD.SV.W.0040.000000T0000Z-210706T0015Z/
Lyon IA-Rock MN-Minnehaha SD-Lincoln SD-
652 PM CDT Mon Jul 5 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR LYON...ROCK...MINNEHAHA AND NORTHERN LINCOLN COUNTIES...

At 651 PM CDT, severe thunderstorms were located along a line
extending from near Dell Rapids to near Brandon to Valley Springs to
near Harrisburg, moving east at 40 mph.

HAZARD...70 mph wind gusts and penny size hail.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

These severe storms will be near...
  Garretson, Valley Springs and Palisades State Park around 655 PM 
  CDT.
  Hills and Beaver Creek around 700 PM CDT.
  Sherman around 705 PM CDT.
  Larchwood, Inwood and Jasper around 710 PM CDT.
  Luverne, Lester and Blue Mounds State Park around 715 PM CDT.
  Alvord around 720 PM CDT.
  Rock Rapids and Hardwick around 725 PM CDT.

Other locations impacted by these severe thunderstorms include
Magnolia, Kenneth and Steen.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4384 9687 4385 9689 4385 9605 4350 9606
      4350 9596 4329 9614 4331 9691 4359 9684
      4384 9690
TIME...MOT...LOC 2351Z 265DEG 35KT 4383 9664 4362 9650 4359 9650 4339
9666

HAIL...0.75IN
WIND...70MPH
 
$$

JM

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 5, 3:24 AM CDT	Heat Advisory	FSD	Aurora, Bon Homme, Brule, Charles Mix, Clay, Davison and 10 more	17 hr
Jul 5, 3:17 PM CDT	Severe Thunderstorm Warning	FSD	Brule	30 min
Jul 5, 5:00 PM CDT	Severe Thunderstorm Warning	FSD	Hutchinson, Turner	29 min
Jul 5, 6:15 PM CDT	Severe Thunderstorm Warning	FSD	McCook, Minnehaha	45 min

Nearby

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