Alert archive / Minnesota / Tornado Warnings in 2021

Tornado Warning 21, NWS Twin Cities, MN

August 28, 2021Brown County, Minnesota

NWS Twin Cities, MN issued this tornado warning at Aug 28, 2021, 10:15 PM CDT for Brown County, Minnesota. It was in force for 30 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, 10:15 PM CDT (03:15 UTC)
Expired: Aug 28, 2021, 10:45 PM CDT
In force: 30 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 1.0 in

County Brown County, MN

The radar

The Minneapolis radar (KMPX), 120 km from the middle of the area, began a volume at 03:18 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 00:00Z, 3.3 hours before the alert went out and 118 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.

513 
WFUS53 KMPX 290315
TORMPX
MNC015-290345-
/O.NEW.KMPX.TO.W.0021.210829T0315Z-210829T0345Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Twin Cities/Chanhassen MN
1015 PM CDT Sat Aug 28 2021

The National Weather Service in the Twin Cities has issued a

* Tornado Warning for...
  Southeastern Brown County in south central Minnesota...

* Until 1045 PM CDT.
    
* At 1015 PM CDT, a severe thunderstorm capable of producing a
  tornado was located 7 miles east of Comfrey, or 18 miles southwest
  of New Ulm, moving east at 25 mph.

  HAZARD...Tornado and quarter size hail.

  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...
  Hanska.

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 4411 9485 4417 9492 4436 9464 4411 9446
TIME...MOT...LOC 0315Z 248DEG 21KT 4414 9476 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

CTG

3 follow-up statements

854 
WWUS53 KMPX 290326
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1026 PM CDT Sat Aug 28 2021

MNC015-290345-
/O.CON.KMPX.TO.W.0021.000000T0000Z-210829T0345Z/
Brown MN-
1026 PM CDT Sat Aug 28 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT FOR
SOUTHEASTERN BROWN COUNTY...
    
At 1026 PM CDT, a severe thunderstorm capable of producing a tornado
was located 9 miles west of Hanska, or 14 miles southwest of New Ulm,
moving east at 25 mph.

HAZARD...Tornado and quarter size hail.

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...
Sleepy Eye and Hanska. 

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 4411 9477 4419 9483 4436 9464 4411 9446
TIME...MOT...LOC 0326Z 248DEG 21KT 4416 9467 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

CTG

496 
WWUS53 KMPX 290335
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1035 PM CDT Sat Aug 28 2021

MNC015-290345-
/O.CON.KMPX.TO.W.0021.000000T0000Z-210829T0345Z/
Brown MN-
1035 PM CDT Sat Aug 28 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 1045 PM CDT FOR
SOUTHEASTERN BROWN COUNTY...
    
At 1035 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Hanska, or 11 miles southwest of New Ulm, moving
east at 25 mph.

HAZARD...Tornado and quarter size hail.

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...
Hanska.

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 4411 9466 4419 9473 4432 9461 4411 9446
TIME...MOT...LOC 0335Z 248DEG 21KT 4418 9460 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN

$$

CTG

795 
WWUS53 KMPX 290342
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
1042 PM CDT Sat Aug 28 2021

MNC015-290352-
/O.EXP.KMPX.TO.W.0021.000000T0000Z-210829T0345Z/
Brown MN-
1042 PM CDT Sat Aug 28 2021

...THE TORNADO WARNING FOR SOUTHEASTERN BROWN COUNTY WILL EXPIRE AT
1045 PM CDT...
        
The storm which prompted the warning has weakened below severe
limits, and has exited the warned area. Therefore, the warning will
be allowed to expire.  However gusty winds and heavy rain are still
possible with this thunderstorm.

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

LAT...LON 4411 9466 4419 9473 4432 9461 4411 9446
TIME...MOT...LOC 0342Z 248DEG 21KT 4419 9456 

$$

CTG

The office that day

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

Issued	Product	Office	Counties	Lasted
Aug 28, 7:13 PM CDT	Severe Thunderstorm Warning	MPX	Blue Earth, Le Sueur, Nicollet, Rice, Sibley	32 min
Aug 28, 7:40 PM CDT	Severe Thunderstorm Warning	MPX	Brown, Redwood	23 min
Aug 28, 7:41 PM CDT	Special Weather Statement	MPX	Blue Earth, Le Sueur, Rice, Scott	34 min
Aug 28, 8:07 PM CDT	Special Weather Statement	MPX	Rice	23 min
Aug 28, 8:17 PM CDT	Special Weather Statement	MPX	Redwood	28 min
Aug 28, 8:26 PM CDT	Special Weather Statement	MPX	Dakota, Goodhue	34 min
Aug 28, 8:57 PM CDT	Special Weather Statement	MPX	Goodhue	33 min
Aug 28, 8:59 PM CDT	Special Weather Statement	MPX	Redwood	31 min
Aug 28, 9:02 PM CDT	Flash Flood Warning	MPX	Redwood	6 hr
Aug 28, 9:29 PM CDT	Special Weather Statement	MPX	Brown	31 min
Aug 28, 10:02 PM CDT	Special Weather Statement	MPX	Brown	43 min
Aug 28, 10:52 PM CDT	Special Weather Statement	MPX	Nicollet	53 min
Aug 28, 11:28 PM CDT	Special Weather Statement	MPX	Le Sueur	47 min
Aug 29, 12:12 AM CDT	Special Weather Statement	MPX	Hennepin, Ramsey	93 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.