Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 108, NWS Sioux Falls, SD

August 26, 2021Brookings County, South Dakota; Lincoln County, Lyon County, Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 26, 2021, 10:39 AM CDT for Brookings County, South Dakota; Lincoln County, Lyon County, Minnesota. It was in force for 66 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 26, 2021, 10:39 AM CDT (15:39 UTC)
Expired: Aug 26, 2021, 11:45 AM CDT
In force: 66 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Damage threat: Considerable
Hail: 0.75 in
Wind: 70.0 mph

Counties Lincoln County, MN, Lyon County, MN, Brookings County, SD

The radar

The Sioux Falls radar (KFSD), 105 km from the middle of the area, began a volume at 15:41 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 26, 10:50 AM CDT	TSTM WND GST 57	3 S Hendricks, MN
Aug 26, 10:57 AM CDT	TSTM WND DMG	Ivanhoe, MN	SPOTTER REPORTS TREES DOWN IN IVANHOE.
Aug 26, 11:01 AM CDT	TSTM WND GST 53	1 Wnw Lake Benton, MN
Aug 26, 11:04 AM CDT	TSTM WND GST 57	1 Ese Taunton, MN
Aug 26, 11:19 AM CDT	TSTM WND GST 58	2 W Marshall, MN

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 26, 9:05 AM CDT	Severe Thunderstorm Watch	SPC	4 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 3.7 hours before the alert went out and 185 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: 1092 m above ground
0-6 km bulk shear: 62 kt
0-1 km storm-relative helicity: 365 m²/s²
0-3 km storm-relative helicity: 490 m²/s²
Significant tornado parameter: 0.0
Supercell composite: -0.4

Open this sounding in Storm Lab

The text

As transmitted.

178 
WUUS53 KFSD 261539
SVRFSD
MNC081-083-SDC011-261645-
/O.NEW.KFSD.SV.W.0108.210826T1539Z-210826T1645Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Sioux Falls SD
1039 AM CDT Thu Aug 26 2021

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Lyon County in southwestern Minnesota...
  Lincoln County in southwestern Minnesota...
  Eastern Brookings County in east central South Dakota...

* Until 1145 AM CDT.

* At 1038 AM CDT, severe thunderstorms were located along a line
  extending from near Brandt to near White to near Brookings, moving
  east at 50 mph.

  HAZARD...70 mph wind gusts.

  SOURCE...Law enforcement reported trees down in Arlington. 

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

* Severe thunderstorms will be near...
  Hendricks around 1050 AM CDT.

Other locations in the path of these severe thunderstorms include
Elkton, Ivanhoe, Arco, Lake Benton, Taunton, Minneota, Tyler, Ghent,
Camden State Park, Marshall, Florence, Cottonwood and Russell.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4436 9560 4420 9579 4420 9675 4444 9658
      4455 9657 4454 9646 4463 9645 4463 9560
TIME...MOT...LOC 1538Z 271DEG 42KT 4467 9654 4447 9661 4430 9683 

THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Kalin

3 follow-up statements

893 
WWUS53 KFSD 261610
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1110 AM CDT Thu Aug 26 2021

SDC011-261618-
/O.CAN.KFSD.SV.W.0108.000000T0000Z-210826T1645Z/
Brookings SD-
1110 AM CDT Thu Aug 26 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN BROOKINGS COUNTY IS
CANCELLED...

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

A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
southwestern Minnesota.

LAT...LON 4436 9560 4420 9579 4420 9645 4441 9642
      4463 9634 4463 9560
TIME...MOT...LOC 1608Z 271DEG 42KT 4466 9607 4446 9614 4429 9637 

$$

MNC081-083-261645-
/O.CON.KFSD.SV.W.0108.000000T0000Z-210826T1645Z/
Lyon MN-Lincoln MN-
1110 AM CDT Thu Aug 26 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 AM CDT
FOR LYON AND LINCOLN COUNTIES...

At 1108 AM CDT, severe thunderstorms were located along a line
extending from near Taunton to near Ivanhoe to near Lake Benton,
moving east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Trained weather spotters reported a wind gust to 57 mph in 
         Hendricks at 1050 am.

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

Locations impacted include...
  Minneota, Taunton, Ghent, Marshall, Cottonwood, Florence, Russell, 
  Camden State Park and Balaton.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4436 9560 4420 9579 4420 9645 4441 9642
      4463 9634 4463 9560
TIME...MOT...LOC 1608Z 271DEG 42KT 4466 9607 4446 9614 4429 9637 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kalin

753 
WWUS53 KFSD 261633
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1133 AM CDT Thu Aug 26 2021

MNC081-083-261645-
/O.CON.KFSD.SV.W.0108.000000T0000Z-210826T1645Z/
Lyon MN-Lincoln MN-
1133 AM CDT Thu Aug 26 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 1145 AM CDT
FOR LYON AND SOUTHEASTERN LINCOLN COUNTIES...

At 1131 AM CDT, severe thunderstorms were located along a line
extending from near Cottonwood to Marshall to near Florence, moving
east at 50 mph.

HAZARD...60 mph wind gusts.

SOURCE...Trained weather spotters a 58 mph gust in Marshall around 
         1120 am

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

Locations impacted include...
Marshall, Minneota, Cottonwood, Tyler, Lake Benton, Balaton, Ghent,
Russell, Florence, Camden State Park and Lynd.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4436 9560 4420 9579 4420 9636 4441 9613
      4463 9603 4463 9560
TIME...MOT...LOC 1631Z 271DEG 42KT 4466 9576 4446 9583 4429 9606 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

Kalin

351 
WWUS53 KFSD 261643
SVSFSD

Severe Weather Statement
National Weather Service Sioux Falls SD
1143 AM CDT Thu Aug 26 2021

MNC081-083-261652-
/O.EXP.KFSD.SV.W.0108.000000T0000Z-210826T1645Z/
Lyon MN-Lincoln MN-
1143 AM CDT Thu Aug 26 2021

...THE SEVERE THUNDERSTORM WARNING FOR LYON AND SOUTHEASTERN LINCOLN
COUNTIES WILL EXPIRE AT 1145 AM CDT...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 300 PM CDT for
southwestern Minnesota.

LAT...LON 4436 9560 4420 9579 4420 9636 4441 9613
      4463 9603 4463 9560
TIME...MOT...LOC 1642Z 271DEG 42KT 4466 9563 4446 9570 4429 9593 

$$

Kalin

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 26, 4:58 AM CDT	Severe Thunderstorm Warning	FSD	Bon Homme, Yankton	27 min
Aug 26, 9:18 AM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Beadle, Kingsbury	57 min
Aug 26, 10:01 AM CDT	Severe Thunderstorm Warning	FSD	Brookings, Kingsbury, Lake, Miner, Moody	59 min

Nearby

Severe Thunderstorm Warnings in Minnesota, 2021 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.