Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 128, NWS Sioux Falls, SD

August 28, 2021Pipestone County, Rock County, Minnesota; Minnehaha County, Moody County, South Dakota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 28, 2021, 6:15 PM CDT for Pipestone County, Rock County, Minnesota; Minnehaha County, Moody County, South Dakota. It was in force for 45 min. 2 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, 6:15 PM CDT (23:15 UTC)
Expired: Aug 28, 2021, 7:00 PM CDT
In force: 45 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Hail: 1.25 in
Wind: 60.0 mph

Counties Pipestone County, MN, Rock County, MN, Minnehaha County, SD, Moody County, SD

The radar

The Sioux Falls radar (KFSD), 60 km from the middle of the area, began a volume at 23:16 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, 6:20 PM CDT	TSTM WND DMG	3 Nnw Ihlen, MN	DELAYED REPORT. LARGE TREE BRANCHES DOWN FROM A COTTONWOOD TREE, BRANCHES WERE AROUND 5 INCHES IN DIAMETER.
Aug 28, 6:20 PM CDT	HAIL 1	3 Nnw Ihlen, MN	DELAYED REPORT.

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, 3:44 PM CDT	Tornado Watch	SPC	5 hr
Aug 28, 3:57 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Aberdeen, SD (KABR), launched 12:00Z, 11.3 hours before the alert went out and 195 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.

718 
WUUS53 KFSD 282315
SVRFSD
MNC117-133-SDC099-101-290000-
/O.NEW.KFSD.SV.W.0128.210828T2315Z-210829T0000Z/

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

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Northwestern Rock County in southwestern Minnesota...
  Pipestone County in southwestern Minnesota...
  Southeastern Moody County in east central South Dakota...
  Northeastern Minnehaha County in southeastern South Dakota...

* Until 700 PM CDT.

* At 615 PM CDT, a severe thunderstorm was located near Sherman, or
  18 miles southwest of Pipestone, moving northeast at 50 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...
  Jasper around 625 PM CDT.
  Trosky and Pipestone National Monument around 635 PM CDT.
  Pipestone around 640 PM CDT.
  Holland and Woodstock around 645 PM CDT.

Other locations impacted by this severe thunderstorm include Hatfield
and Ihlen.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

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

&&

LAT...LON 4412 9606 4393 9607 4371 9660 4381 9671
      4420 9626 4420 9618
TIME...MOT...LOC 2315Z 233DEG 46KT 4381 9657 

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

$$

APT

2 follow-up statements

202 
WWUS53 KFSD 282329
SVSFSD

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

MNC133-SDC099-282339-
/O.CAN.KFSD.SV.W.0128.000000T0000Z-210829T0000Z/
Rock MN-Minnehaha SD-
629 PM CDT Sat Aug 28 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHWESTERN ROCK AND
NORTHEASTERN MINNEHAHA COUNTIES IS CANCELLED...
    
The severe thunderstorm which prompted the warning has moved out of 
the warned area. Therefore, the warning has been cancelled.

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

LAT...LON 4412 9606 4393 9607 4385 9637 4385 9664
      4420 9626 4420 9618
TIME...MOT...LOC 2329Z 233DEG 46KT 4392 9637 

$$

MNC117-SDC101-290000-
/O.CON.KFSD.SV.W.0128.000000T0000Z-210829T0000Z/
Pipestone MN-Moody SD-
629 PM CDT Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR PIPESTONE AND SOUTHEASTERN MOODY COUNTIES...

At 629 PM CDT, a severe thunderstorm was located near Jasper, or near
Pipestone, moving northeast at 55 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 storm will be near...
  Pipestone National Monument around 635 PM CDT.
  Holland and Woodstock around 645 PM CDT.

Other locations impacted by this severe thunderstorm include Hatfield
and Ihlen.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4412 9606 4393 9607 4385 9637 4385 9664
      4420 9626 4420 9618
TIME...MOT...LOC 2329Z 233DEG 46KT 4392 9637 

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

$$

APT

025 
WWUS53 KFSD 282339
SVSFSD

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

MNC117-SDC101-290000-
/O.CON.KFSD.SV.W.0128.000000T0000Z-210829T0000Z/
Pipestone MN-Moody SD-
639 PM CDT Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 700 PM CDT
FOR PIPESTONE AND SOUTHEASTERN MOODY COUNTIES...

At 638 PM CDT, a severe thunderstorm was located near Ihlen, or 8 
miles southwest of Pipestone, moving northeast at 25 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 storm will be near...
  Trosky around 655 PM CDT.
  Pipestone and Pipestone National Monument around 700 PM CDT.
  Holland and Woodstock around 720 PM CDT.

Other locations impacted by this severe thunderstorm include Hatfield
and Ihlen.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

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

&&

LAT...LON 4412 9606 4393 9607 4385 9637 4385 9664
      4420 9626 4420 9618
TIME...MOT...LOC 2338Z 232DEG 22KT 4391 9644 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.50 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, 4:45 PM CDT	Tornado Warning	FSD	Rock	30 min
Aug 28, 4:49 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Nobles, Rock	41 min
Aug 28, 5:00 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Nobles, Rock	45 min
Aug 28, 5:06 PM CDT	Tornado Warning	FSD	Murray, Nobles, Pipestone, Rock	24 min
Aug 28, 5:24 PM CDT	Tornado Warning	FSD	Nobles	36 min
Aug 28, 5:26 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Cottonwood, Jackson, Murray, Nobles, Pipestone, Rock	34 min
Aug 28, 5:26 PM CDT	Tornado Warning	FSD	Cottonwood, Murray	34 min
Aug 28, 5:29 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Cottonwood, Jackson, Murray, Nobles, Pipestone, Rock	31 min
Aug 28, 5:34 PM CDT	Severe Thunderstorm Warning	FSD	Rock	17 min
Aug 28, 5:43 PM CDT	Tornado Warning	FSD	Cottonwood, Murray	32 min
Aug 28, 5:45 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Cottonwood, Jackson, Murray, Nobles	45 min
Aug 28, 5:49 PM CDT	Tornado Warning	FSD	Cottonwood, Jackson, Murray, Nobles	26 min
Aug 28, 6:01 PM CDT	Tornado Warning	FSD	Cottonwood	30 min
Aug 28, 6:53 PM CDT	Severe Thunderstorm Warning	FSD	Rock	52 min
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, 6:14 PM CDT	Severe Thunderstorm Warning	FSD	Hanson, Lake, McCook	31 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

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.