Alert archive / Minnesota / Tornado Warnings in 2021

Tornado Warning 20, NWS Twin Cities, MN

August 28, 2021Brown County, Nicollet County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Aug 28, 2021, 6:51 PM CDT for Brown County, Nicollet County, Minnesota. It was in force for 24 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Aug 28, 2021, 6:51 PM CDT (23:51 UTC)
Expired: Aug 28, 2021, 7:15 PM CDT
In force: 24 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

Counties Brown County, MN, Nicollet County, MN

The radar

The Minneapolis radar (KMPX), 97 km from the middle of the area, began a volume at 23:55 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.

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, 5:59 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.9 hours before the alert went out and 95 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.

493 
WFUS53 KMPX 282351
TORMPX
MNC015-103-290015-
/O.NEW.KMPX.TO.W.0020.210828T2351Z-210829T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Twin Cities/Chanhassen MN
651 PM CDT Sat Aug 28 2021

The National Weather Service in the Twin Cities has issued a

* Tornado Warning for...
  East central Brown County in south central Minnesota...
  North central Nicollet County in south central Minnesota...

* Until 715 PM CDT.
    
* At 650 PM CDT, a severe thunderstorm capable of producing a tornado
  was located 6 miles east of Sleepy Eye, or 7 miles west of New Ulm,
  moving northeast at 45 mph.

  HAZARD...Tornado.

  SOURCE...Radar indicated rotation. Trained spotters have reported 
           a funnel cloud. 

  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...
  New Ulm around 655 PM CDT.
  Lafayette around 710 PM CDT.

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 4425 9466 4432 9474 4445 9440 4434 9427
TIME...MOT...LOC 2350Z 244DEG 37KT 4432 9460 

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

$$

Dye

1 follow-up statement

493 
WWUS53 KMPX 290009 RRA
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
709 PM CDT Sat Aug 28 2021

MNC015-103-290018-
/O.EXP.KMPX.TO.W.0020.000000T0000Z-210829T0015Z/
Brown MN-Nicollet MN-
709 PM CDT Sat Aug 28 2021

...THE TORNADO WARNING FOR EAST CENTRAL BROWN AND NORTH CENTRAL
NICOLLET COUNTIES WILL EXPIRE AT 715 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer appears capable of producing a tornado.
Therefore, the warning will be allowed to expire.

A Severe Thunderstorm Watch remains in effect until 1100 PM CDT for
south central Minnesota.

Remember, a Severe Thunderstorm Warning still remains in effect 
until 745 PM.

LAT...LON 4425 9466 4432 9474 4445 9440 4434 9427
TIME...MOT...LOC 0008Z 244DEG 37KT 4440 9438 

$$

Dye

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Aug 27, 8:21 PM CDT	Flash Flood Warning	MPX	Freeborn	4 hr
Aug 27, 11:48 PM CDT	Special Weather Statement	MPX	Freeborn	87 min
Aug 28, 8:14 AM CDT	Special Weather Statement	MPX	Stevens	61 min
Aug 28, 9:27 AM CDT	Severe Thunderstorm Warning Considerable damage threat	MPX	Lac qui Parle	33 min
Aug 28, 9:49 AM CDT	Severe Thunderstorm Warning	MPX	Douglas, Pope, Stevens	56 min
Aug 28, 9:54 AM CDT	Severe Thunderstorm Warning	MPX	Swift	51 min
Aug 28, 10:31 AM CDT	Severe Thunderstorm Warning Destructive damage threat	MPX	Swift	44 min
Aug 28, 10:41 AM CDT	Severe Thunderstorm Warning	MPX	Douglas, Pope, Stearns, Todd	49 min
Aug 28, 10:53 AM CDT	Severe Thunderstorm Warning	MPX	Kandiyohi	52 min
Aug 28, 11:20 AM CDT	Severe Thunderstorm Warning Considerable damage threat	MPX	Stearns	40 min
Aug 28, 11:24 AM CDT	Tornado Warning	MPX	Stearns	36 min
Aug 28, 11:32 AM CDT	Severe Thunderstorm Warning Considerable damage threat	MPX	Morrison, Todd	43 min
Aug 28, 11:45 AM CDT	Severe Thunderstorm Warning Considerable damage threat	MPX	Benton, Mille Lacs, Morrison, Sherburne	45 min
Aug 28, 12:04 PM CDT	Tornado Warning	MPX	Benton, Mille Lacs	41 min
Aug 28, 12:27 PM CDT	Severe Thunderstorm Warning Considerable damage threat	MPX	Isanti, Kanabec, Mille Lacs	48 min
Aug 28, 12:43 PM CDT	Special Weather Statement	MPX	Anoka	47 min
Aug 28, 1:07 PM CDT	Special Weather Statement	MPX	Chisago	23 min
Aug 28, 1:29 PM CDT	Severe Thunderstorm Warning	MPX	Chisago, Isanti	46 min
Aug 28, 6:06 PM CDT	Severe Thunderstorm Warning Considerable damage threat	MPX	Brown, Redwood, Watonwan	54 min
Aug 28, 6:19 PM CDT	Tornado Warning	MPX	Brown, Redwood	26 min
Aug 28, 6:26 PM CDT	Severe Thunderstorm Warning Considerable damage threat	MPX	Blue Earth, Faribault, Martin, Watonwan	64 min
Aug 28, 6:43 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Brown, Nicollet, Redwood, Renville, Sibley and 1 more	62 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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.