Alert archive / Wisconsin / Tornado Warnings in 2021

Tornado Warning 27, NWS Twin Cities, MN

December 15, 2021Dunn County, Pepin County, Wisconsin

NWS Twin Cities, MN issued this tornado warning at Dec 15, 2021, 8:17 PM CST for Dunn County, Pepin County, Wisconsin. It was in force for 28 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: Dec 15, 2021, 8:17 PM CST (02:17 UTC)
Expired: Dec 15, 2021, 8:45 PM CST
In force: 28 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.0 in

Counties Dunn County, WI, Pepin County, WI

The radar

The La Crosse radar (KARX), 107 km from the middle of the area, began a volume at 02:18 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
Dec 15, 5:30 PM CST	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 2.3 hours before the alert went out and 130 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: 633 J/kg
Mixed-layer CIN: -55 J/kg
Mixed-layer LCL: 770 m above ground
0-6 km bulk shear: 75 kt
0-1 km storm-relative helicity: 443 m²/s²
0-3 km storm-relative helicity: 470 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 5.7

Open this sounding in Storm Lab

The text

As transmitted.

806 
WFUS53 KMPX 160217
TORMPX
WIC033-091-160245-
/O.NEW.KMPX.TO.W.0027.211216T0217Z-211216T0245Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Twin Cities/Chanhassen MN
817 PM CST Wed Dec 15 2021

The National Weather Service in the Twin Cities has issued a

* Tornado Warning for...
  Pepin County in west central Wisconsin...
  Southeastern Dunn County in west central Wisconsin...

* Until 845 PM CST.

* At 816 PM CST, severe thunderstorms capable of producing both
  tornadoes and extensive straight line wind damage were located near
  Wabasha, moving northeast at 70 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...
  Durand and Eau Galle around 835 PM CST.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

Tornadoes are extremely difficult to see and confirm at night. Do not
wait to see or hear the tornado. TAKE COVER NOW!

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 4459 9178 4460 9196 4459 9197 4460 9200
      4458 9203 4447 9206 4441 9209 4445 9223
      4454 9217 4454 9213 4461 9214 4488 9199
      4476 9165
TIME...MOT...LOC 0216Z 205DEG 61KT 4438 9213 

TORNADO...RADAR INDICATED
MAX HAIL SIZE...0.00 IN

$$

Dye

1 follow-up statement

262 
WWUS53 KMPX 160236
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
836 PM CST Wed Dec 15 2021

WIC033-091-160245-
/O.EXP.KMPX.TO.W.0027.000000T0000Z-211216T0245Z/
Pepin WI-Dunn WI-
836 PM CST Wed Dec 15 2021

...THE TORNADO WARNING FOR PEPIN AND SOUTHEASTERN DUNN COUNTIES WILL
EXPIRE AT 845 PM CST...
                
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 Tornado Watch remains in effect until 1100 PM CST for west central
Wisconsin.

Remember, a Severe Thunderstorm Warning still remains in effect for
Pepin and Dunn Counties.

LAT...LON 4459 9178 4460 9196 4459 9197 4460 9200
      4458 9203 4447 9206 4441 9209 4445 9223
      4454 9217 4454 9213 4461 9214 4488 9199
      4476 9165
TIME...MOT...LOC 0235Z 205DEG 61KT 4467 9194 

$$

Dye

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 15, 8:09 PM CST	Severe Thunderstorm Warning	MPX	Dunn, Pepin, Pierce, Saint Croix	36 min
Dec 15, 8:31 PM CST	Severe Thunderstorm Warning	MPX	Chippewa, Dunn, Eau Claire, Pepin	44 min
Dec 15, 9:10 PM CST	Severe Thunderstorm Warning	MPX	Chippewa, Rusk	28 min

Nearby

Tornado Warnings in Wisconsin, 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.