Alert archive / Wisconsin / Tornado Warnings in 2020

Tornado Warning 23, NWS Twin Cities, MN

July 21, 2020Dunn County, Wisconsin

NWS Twin Cities, MN issued this tornado warning at Jul 21, 2020, 6:15 PM CDT for Dunn County, Wisconsin. It was in force for 60 min. 2 reports 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: Jul 21, 2020, 6:15 PM CDT (23:15 UTC)
Expired: Jul 21, 2020, 7:15 PM CDT
In force: 60 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Radar indicated
Hail: 0.75 in

County Dunn County, WI

The radar

The Minneapolis radar (KMPX), 146 km from the middle of the area, began a volume at 23:14 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
Jul 21, 6:35 PM CDT	FUNNEL CLOUD	8 Wsw New Auburn, WI
Jul 21, 6:41 PM CDT	TORNADO	6 Ne Wheeler, WI	BRIEF TOUCHDOWN NORTHEAST OF WHEELER.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.3 hours before the alert went out and 149 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: -84 J/kg
Mixed-layer LCL: 1094 m above ground
0-6 km bulk shear: 52 kt
0-1 km storm-relative helicity: 159 m²/s²
0-3 km storm-relative helicity: 214 m²/s²
Significant tornado parameter: 0.1
Supercell composite: 1.7

Open this sounding in Storm Lab

The text

As transmitted.

676 
WFUS53 KMPX 212315
TORMPX
WIC033-220015-
/O.NEW.KMPX.TO.W.0023.200721T2315Z-200722T0015Z/

BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service Twin Cities/Chanhassen MN
615 PM CDT Tue Jul 21 2020

The National Weather Service in The Twin Cities has issued a

* Tornado Warning for...
  Northeastern Dunn County in west central Wisconsin...

* Until 715 PM CDT.
    
* At 615 PM CDT, a severe thunderstorm capable of producing a tornado
  was located over Ridgeland, or 19 miles north of Menomonie, moving
  east at 15 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 tornadic thunderstorm will remain over mainly rural areas of
  northeastern Dunn County, including the following locations... Sand
  Creek.

# 

# 

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 4505 9165 4514 9197 4521 9198 4521 9167
      4512 9167 4512 9165
TIME...MOT...LOC 2315Z 289DEG 14KT 4518 9192 

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

$$

JRB

3 follow-up statements

092 
WWUS53 KMPX 212330
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
630 PM CDT Tue Jul 21 2020

WIC033-220015-
/O.CON.KMPX.TO.W.0023.000000T0000Z-200722T0015Z/
Dunn WI-
630 PM CDT Tue Jul 21 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR
NORTHEASTERN DUNN COUNTY...
    
At 630 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Ridgeland, or 17 miles north of Menomonie, moving
southeast at 20 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...
Sand Creek.

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 4512 9191 4516 9190 4517 9167 4512 9167
      4512 9165 4505 9165
TIME...MOT...LOC 2330Z 293DEG 18KT 4514 9181 

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

$$

JRB

694 
WWUS53 KMPX 212343
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
643 PM CDT Tue Jul 21 2020

WIC033-220015-
/O.CON.KMPX.TO.W.0023.000000T0000Z-200722T0015Z/
Dunn WI-
643 PM CDT Tue Jul 21 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 715 PM CDT FOR
NORTHEASTERN DUNN COUNTY...
    
At 643 PM CDT, a severe thunderstorm capable of producing a tornado
was located 7 miles north of Colfax, or 16 miles northeast of
Menomonie, moving southeast at 20 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 tornadic thunderstorm will remain over mainly rural areas of
northeastern Dunn County.

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 4510 9182 4514 9180 4514 9167 4512 9167
      4512 9165 4505 9165
TIME...MOT...LOC 2343Z 293DEG 18KT 4511 9173 

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

$$

JRB

561 
WWUS53 KMPX 220014
SVSMPX

Severe Weather Statement
National Weather Service Twin Cities/Chanhassen MN
714 PM CDT Tue Jul 21 2020

WIC033-220024-
/O.EXP.KMPX.TO.W.0023.000000T0000Z-200722T0015Z/
Dunn WI-
714 PM CDT Tue Jul 21 2020

...THE TORNADO WARNING FOR NORTHEASTERN DUNN COUNTY WILL EXPIRE AT
715 PM CDT...
        
The storm which prompted the warning has moved out of the area.
Therefore, the warning will be allowed to expire.

To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
The Twin Cities.

LAT...LON 4510 9182 4514 9180 4514 9167 4512 9167
      4512 9165 4505 9165
TIME...MOT...LOC 0014Z 289DEG 14KT 4507 9158 

$$

JRB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 3:59 PM CDT	Special Weather Statement	MPX	Polk	31 min
Jul 21, 4:31 PM CDT	Special Weather Statement	MPX	Polk	44 min
Jul 21, 5:15 PM CDT	Special Weather Statement	MPX	Polk	60 min
Jul 21, 5:39 PM CDT	Special Weather Statement	MPX	Barron	51 min
Jul 21, 5:39 PM CDT	Tornado Warning	MPX	Barron	36 min
Jul 21, 5:42 PM CDT	Tornado Warning	MPX	Barron, Dunn	33 min
Jul 21, 6:14 PM CDT	Tornado Warning	MPX	Barron	3 min
Jul 21, 6:15 PM CDT	Tornado Warning	MPX	Barron	45 min
Jul 21, 6:23 PM CDT	Tornado Warning	MPX	Barron	52 min

Nearby

Tornado Warnings in Wisconsin, 2020 Every tornado warning in 2020 Tornadoes in 2020

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.