Alert archive / Minnesota / Tornado Warnings in 2021

Tornado Warning 12, NWS Sioux Falls, SD

August 28, 2021Nobles County, Minnesota

NWS Sioux Falls, SD issued this tornado warning at Aug 28, 2021, 5:24 PM CDT for Nobles County, Minnesota. It was in force for 36 min. 1 report 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, 5:24 PM CDT (22:24 UTC)
Expired: Aug 28, 2021, 6:00 PM CDT
In force: 36 min
Issued by: NWS Sioux Falls, SD
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Nobles County, MN

The radar

The Sioux Falls radar (KFSD), 80 km from the middle of the area, began a volume at 22:23 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, 5:45 PM CDT	TSTM WND GST 55	Worthington, MN	WALL CLOUD PUSHED ACROSS TOWN, SWITCHING WINDS FROM NEARLY CALM TO GUSTY AT 44 TO 55 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, 10.4 hours before the alert went out and 218 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.

339 
WFUS53 KFSD 282224
TORFSD
MNC105-282300-
/O.NEW.KFSD.TO.W.0012.210828T2224Z-210828T2300Z/

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

The National Weather Service in Sioux Falls has issued a

* Tornado Warning for...
  Central Nobles County in southwestern Minnesota...

* Until 600 PM CDT.
    
* At 523 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Adrian, or 14 miles east of Luverne, 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.

* This dangerous storm will be near...
  Rushmore around 530 PM CDT.

Other locations in the path of this tornadic thunderstorm include
Worthington and Brewster.

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 4355 9602 4373 9604 4380 9546 4356 9545
      4355 9546
TIME...MOT...LOC 2223Z 265DEG 40KT 4365 9592 

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

$$

Kalin

2 follow-up statements

281 
WWUS53 KFSD 282233
SVSFSD

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

MNC105-282300-
/O.CON.KFSD.TO.W.0012.000000T0000Z-210828T2300Z/
Nobles MN-
533 PM CDT Sat Aug 28 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CDT FOR CENTRAL
NOBLES COUNTY...
    
At 531 PM CDT, a severe thunderstorm capable of producing a tornado 
was located just  north of Rushmore, or 9 miles west of Worthington, 
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.

Locations impacted include...
  Worthington and Brewster.

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 4355 9602 4373 9604 4380 9546 4356 9545
      4355 9546
TIME...MOT...LOC 2231Z 265DEG 40KT 4366 9579 

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

$$

Kalin

641 
WWUS53 KFSD 282244
SVSFSD

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

MNC105-282300-
/O.CON.KFSD.TO.W.0012.000000T0000Z-210828T2300Z/
Nobles MN-
544 PM CDT Sat Aug 28 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 600 PM CDT FOR EASTERN
NOBLES COUNTY...

At 544 PM CDT, a severe squall line capable of producing both 
tornadoes and extensive straight line wind damage was located just 
north of Worthington, 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.

Locations impacted include...
  Brewster.

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 4355 9586 4376 9581 4380 9546 4356 9545
      4355 9546
TIME...MOT...LOC 2244Z 265DEG 40KT 4367 9560 

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

$$

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, 5:26 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, 6:15 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.