Alert archive / Minnesota / Tornado Warnings in 2021

Tornado Warning 15, NWS Sioux Falls, SD

August 28, 20214 counties in Minnesota

NWS Sioux Falls, SD issued this tornado warning at Aug 28, 2021, 5:49 PM CDT for 4 counties in Minnesota. It was in force for 26 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, 5:49 PM CDT (22:49 UTC)
Expired: Aug 28, 2021, 6:15 PM CDT
In force: 26 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Cottonwood County, MN, Jackson County, MN, Murray County, MN, Nobles County, MN

The radar

The Sioux Falls radar (KFSD), 117 km from the middle of the area, began a volume at 22:50 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, 6:06 PM CDT	TSTM WND DMG	Windom, MN	REPORT FROM MPING: TREES UPROOTED OR SNAPPED; ROOF BLOWN OFF.
Aug 28, 6:06 PM CDT	TSTM WND GST 66	2 Nne Windom, MN	DELAYED REPORT. AWOS STATION KMWM WINDOM MUNICIPAL AIRPORT REPORTED GUST OF 66 MPH.

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 12:00Z, 10.8 hours before the alert went out and 177 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: 1550 J/kg
Mixed-layer CIN: -130 J/kg
Mixed-layer LCL: 676 m above ground
0-6 km bulk shear: 29 kt
0-1 km storm-relative helicity: 139 m²/s²
0-3 km storm-relative helicity: 193 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 2.3

Open this sounding in Storm Lab

The text

As transmitted.

090 
WFUS53 KFSD 282249
TORFSD
MNC033-063-101-105-282315-
/O.NEW.KFSD.TO.W.0015.210828T2249Z-210828T2315Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Sioux Falls SD
549 PM CDT Sat Aug 28 2021

The National Weather Service in Sioux Falls has issued a

* Tornado Warning for...
  Northern Jackson County in southwestern Minnesota...
  Northeastern Nobles County in southwestern Minnesota...
  Southeastern Murray County in southwestern Minnesota...
  Southern Cottonwood County in southwestern Minnesota...

* Until 615 PM CDT.

* At 548 PM CDT, severe thunderstorms capable of producing both
  tornadoes and extensive straight line wind damage were located near
  Dundee, or 15 miles west of Windom, moving east at 45 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be damaged or destroyed. 
           Damage to roofs, windows, and vehicles will occur.  Tree 
           damage is likely.

* These dangerous storms will be near...
  Windom around 605 PM CDT.

Other locations in the path of this tornadic thunderstorm include
Bingham Lake.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.

&&

LAT...LON 4373 9551 4393 9561 4408 9502 4374 9495
TIME...MOT...LOC 2248Z 248DEG 40KT 4386 9543 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...<.75 IN

$$

Kalin

1 follow-up statement

874 
WWUS53 KFSD 282312
SVSFSD

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

MNC033-063-101-105-282321-
/O.EXP.KFSD.TO.W.0015.000000T0000Z-210828T2315Z/
Jackson MN-Nobles MN-Murray MN-Cottonwood MN-
612 PM CDT Sat Aug 28 2021

...THE TORNADO WARNING FOR NORTHERN JACKSON...NORTHEASTERN NOBLES...
SOUTHEASTERN MURRAY AND SOUTHERN COTTONWOOD COUNTIES WILL EXPIRE AT
615 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

A Tornado Watch remains in effect until 900 PM CDT for southwestern
Minnesota.

Remember, a Tornado Warning still remains in effect for central and 
northern Cottonwood county until 645 pm. 

LAT...LON 4373 9551 4393 9561 4408 9502 4374 9495
TIME...MOT...LOC 2311Z 248DEG 40KT 4396 9510 

$$

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, 6:01 PM CDT	Tornado Warning	FSD	Cottonwood	30 min
Aug 28, 6:15 PM CDT	Severe Thunderstorm Warning	FSD	Pipestone, Rock	45 min
Aug 28, 6:53 PM CDT	Severe Thunderstorm Warning	FSD	Rock	52 min

Nearby

Tornado Warnings in Minnesota, 2021 Every tornado warning in 2021 Tornadoes 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.