Alert archive / Minnesota / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 134, NWS Sioux Falls, SD

August 28, 20214 counties in Minnesota

NWS Sioux Falls, SD issued this severe thunderstorm warning at Aug 28, 2021, 7:00 PM CDT for 4 counties in Minnesota. It was in force for 45 min. 3 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, 7:00 PM CDT (00:00 UTC)
Expired: Aug 28, 2021, 7:45 PM CDT
In force: 45 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Damage threat: Considerable
Hail: 1.75 in
Wind: 60.0 mph

Counties Lincoln County, MN, Lyon County, MN, Murray County, MN, Pipestone County, MN

The radar

The Sioux Falls radar (KFSD), 93 km from the middle of the area, began a volume at 00:02 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, 7:36 PM CDT	HAIL 3.5	2 Ssw Current Lake, MN	PICTURE VIA SOCIAL MEDIA.
Aug 28, 7:40 PM CDT	HAIL 2	3 Ssw Current Lake, MN	DELAYED REPORT. MEASURED HAIL AT 2.25 INCHES IN DIAMETER.
Aug 28, 7:41 PM CDT	HAIL 4	2 Ssw Current Lake, MN	DELAYED REPORT. SOCIAL MEDIA REPORTS LARGE HAIL MEASURED AT 3.75 INCHES.

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

Minneapolis, MN (KMPX), launched 00:00Z, 0.0 hours before the alert went out and 197 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: 1990 J/kg
Mixed-layer CIN: -120 J/kg
Mixed-layer LCL: 977 m above ground
0-6 km bulk shear: 31 kt
0-1 km storm-relative helicity: 252 m²/s²
0-3 km storm-relative helicity: 227 m²/s²
Significant tornado parameter: 1.0
Supercell composite: 5.0

Open this sounding in Storm Lab

The text

As transmitted.

463 
WUUS53 KFSD 290000
SVRFSD
MNC081-083-101-117-290045-
/O.NEW.KFSD.SV.W.0134.210829T0000Z-210829T0045Z/

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

The National Weather Service in Sioux Falls has issued a

* Severe Thunderstorm Warning for...
  Southern Lyon County in southwestern Minnesota...
  Southeastern Lincoln County in southwestern Minnesota...
  Northwestern Murray County in southwestern Minnesota...
  Pipestone County in southwestern Minnesota...

* Until 745 PM CDT.

* At 659 PM CDT, a severe thunderstorm was located near Pipestone,
  moving northeast at 50 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.

* This severe thunderstorm will be near...
  Holland and Woodstock around 705 PM CDT.
  Ruthton around 715 PM CDT.

Other locations in the path of this severe thunderstorm include
Florence, Current Lake, Balaton and Tracy.

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 4421 9559 4420 9559 4419 9557 4417 9554
      4389 9626 4405 9646 4405 9645 4445 9591
TIME...MOT...LOC 2359Z 232DEG 45KT 4401 9626 

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

$$

Kalin

1 follow-up statement

671 
WWUS53 KFSD 290012
SVSFSD

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

MNC081-083-101-117-290045-
/O.CON.KFSD.SV.W.0134.000000T0000Z-210829T0045Z/
Lyon MN-Lincoln MN-Murray MN-Pipestone MN-
712 PM CDT Sat Aug 28 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 745 PM CDT
FOR SOUTHERN LYON...SOUTHEASTERN LINCOLN...NORTHWESTERN MURRAY AND
PIPESTONE COUNTIES...

At 711 PM CDT, a severe thunderstorm was located over Holland, or 8
miles northeast of Pipestone, moving northeast at 20 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...
  Woodstock around 715 PM CDT.

Other locations in the path of this severe thunderstorm include
Ruthton, Florence, Current Lake, Balaton and Russell.

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 4421 9559 4420 9559 4419 9557 4417 9554
      4389 9626 4405 9646 4405 9645 4445 9591
TIME...MOT...LOC 0011Z 229DEG 19KT 4406 9617 

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, 7:23 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Rock	52 min
Aug 28, 7:34 PM CDT	Severe Thunderstorm Warning	FSD	Lyon, Murray, Pipestone	56 min
Aug 28, 7:48 PM CDT	Severe Thunderstorm Warning	FSD	Rock	31 min
Aug 28, 8:03 PM CDT	Flash Flood Warning	FSD	Murray, Pipestone	6 hr
Aug 28, 8:06 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Nobles, Rock	54 min
Aug 28, 8:17 PM CDT	Severe Thunderstorm Warning Considerable damage threat	FSD	Cottonwood, Lyon, Murray	58 min
Aug 28, 8:52 PM CDT	Severe Thunderstorm Warning	FSD	Murray, Nobles, Rock	23 min
Aug 28, 9:13 PM CDT	Severe Thunderstorm Warning	FSD	Jackson, Nobles, Rock	47 min
Aug 28, 9:29 PM CDT	Flash Flood Warning	FSD	Murray, Nobles, Pipestone, Rock	3 hr
Aug 28, 10:04 PM CDT	Flash Flood Warning	FSD	Cottonwood, Jackson, Murray, Nobles	4 hr
Aug 28, 10:24 PM CDT	Flash Flood Warning	FSD	Cottonwood, Jackson	5 hr

Nearby

Severe Thunderstorm Warnings in Minnesota, 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.