Alert archive / Minnesota / Tornado Warnings in 2021

Tornado Warning 17, NWS La Crosse, WI

September 20, 2021Fillmore County, Minnesota

NWS La Crosse, WI issued this tornado warning at Sep 20, 2021, 5:03 PM CDT for Fillmore County, Minnesota. It was in force for 27 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: Sep 20, 2021, 5:03 PM CDT (22:03 UTC)
Expired: Sep 20, 2021, 5:30 PM CDT
In force: 27 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Fillmore County, MN

The radar

The La Crosse radar (KARX), 82 km from the middle of the area, began a volume at 22:01 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
Sep 20, 2:07 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 10.1 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: 148 J/kg
Mixed-layer CIN: -141 J/kg
Mixed-layer LCL: 1002 m above ground
0-6 km bulk shear: 37 kt
0-1 km storm-relative helicity: 210 m²/s²
0-3 km storm-relative helicity: 162 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 1.4

Open this sounding in Storm Lab

The text

As transmitted.

947 
WFUS53 KARX 202203
TORARX
MNC045-202230-
/O.NEW.KARX.TO.W.0017.210920T2203Z-210920T2230Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service La Crosse WI
503 PM CDT Mon Sep 20 2021

The National Weather Service in La Crosse has issued a

* Tornado Warning for...
  Central Fillmore County in southeastern Minnesota...

* Until 530 PM CDT.
    
* At 502 PM CDT, a severe thunderstorm capable of producing a tornado
  was located near Wykoff, or 9 miles southwest of Preston, moving
  northeast at 35 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...
  Preston around 515 PM CDT.
  Fountain around 520 PM CDT.
  Lanesboro around 525 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Forestville State Park, Greenleafton, Carimona, Cherry Grove, Old
Barn Campground and Isinours.

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.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4354 9222 4357 9234 4379 9218 4371 9195
TIME...MOT...LOC 2202Z 215DEG 31KT 4362 9225 

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

$$

Skow

2 follow-up statements

737 
WWUS53 KARX 202215
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
515 PM CDT Mon Sep 20 2021

MNC045-202230-
/O.CON.KARX.TO.W.0017.000000T0000Z-210920T2230Z/
Fillmore MN-
515 PM CDT Mon Sep 20 2021

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 530 PM CDT FOR CENTRAL
FILLMORE COUNTY...
    
At 515 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Fountain, or near Preston, moving northeast at 35
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...
  Lanesboro around 525 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Carimona, Old Barn Campground and Isinours.

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.

This cluster of thunderstorms is capable of producing tornadoes and
widespread significant wind damage. Do not wait to see or hear the
tornado. For your protection move to an interior room on the lowest
floor of a building.

&&

LAT...LON 4358 9215 4372 9222 4379 9218 4371 9195
TIME...MOT...LOC 2215Z 215DEG 31KT 4371 9216 

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

$$

Skow

075 
WWUS53 KARX 202220
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
520 PM CDT Mon Sep 20 2021

MNC045-202230-
/O.EXP.KARX.TO.W.0017.000000T0000Z-210920T2230Z/
Fillmore MN-
520 PM CDT Mon Sep 20 2021

...THE TORNADO WARNING FOR CENTRAL FILLMORE COUNTY WILL EXPIRE AT 530
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.  However gusty
winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
southeastern Minnesota.

LAT...LON 4358 9215 4372 9222 4379 9218 4371 9195
TIME...MOT...LOC 2220Z 215DEG 31KT 4374 9214 

$$

Skow

The office that day

Everything else NWS La Crosse, WI issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Sep 20, 3:23 PM CDT	Special Weather Statement	ARX	Mower	37 min
Sep 20, 3:47 PM CDT	Severe Thunderstorm Warning	ARX	Dodge, Fillmore, Mower, Olmsted	43 min
Sep 20, 4:30 PM CDT	Severe Thunderstorm Warning	ARX	Fillmore, Mower, Olmsted, Wabasha, Winona	45 min
Sep 20, 5:12 PM CDT	Special Weather Statement	ARX	Winona	33 min
Sep 20, 5:38 PM CDT	Special Weather Statement	ARX	Houston	37 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.