Alert archive / Wisconsin / Tornado Warnings in 2020

Tornado Warning 27, NWS Twin Cities, MN

July 21, 2020Chippewa County, Eau Claire County, Wisconsin

NWS Twin Cities, MN issued this tornado warning at Jul 21, 2020, 8:19 PM CDT for Chippewa County, Eau Claire County, Wisconsin. It was in force for 41 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, 8:19 PM CDT (01:19 UTC)
Expired: Jul 21, 2020, 9:00 PM CDT
In force: 41 min
Issued by: NWS Twin Cities, MN
Area: Storm-based polygon
Tornado: Observed
Hail: 0.75 in

Counties Chippewa County, WI, Eau Claire County, WI

The radar

The La Crosse radar (KARX), 118 km from the middle of the area, began a volume at 01:20 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, 8:26 PM CDT	TORNADO	5 Nnw Eau Claire, WI	SEVERAL TRAINED SPOTTERS CONFIRMED A TORNADO NEAR HIGHWAY 29, NORTH OF EAU CLAIRE. THERE WAS DEBRIS ASSOCIATED WITH THE FUNNEL THAT MADE CONTACT WITH THE GROUND. IT LASTED FOR 4 MINUTES BEFORE LIFTING.
Jul 21, 8:45 PM CDT	TORNADO	3 S Chippewa Falls, WI	BRIEF TOUCHDOWN REPORTED.

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 00:00Z, 1.3 hours before the alert went out and 169 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: 8 J/kg
Mixed-layer CIN: -37 J/kg
Mixed-layer LCL: 1146 m above ground
0-6 km bulk shear: 43 kt
0-1 km storm-relative helicity: -2 m²/s²
0-3 km storm-relative helicity: 44 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

389 
WFUS53 KMPX 220119
TORMPX
WIC017-035-220200-
/O.NEW.KMPX.TO.W.0027.200722T0119Z-200722T0200Z/

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

The National Weather Service in The Twin Cities has issued a

* Tornado Warning for...
  South central Chippewa County in west central Wisconsin...
  Northwestern Eau Claire County in west central Wisconsin...

* Until 900 PM CDT.

* At 819 PM CDT, a confirmed tornado was located near Eau Claire,
  moving east at 20 mph.

  HAZARD...Damaging tornado.

  SOURCE...Weather spotters confirmed tornado.

  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.

* The tornado will be near...
  Chippewa Falls and Lake Hallie around 825 PM CDT.
  Altoona around 830 PM CDT.
  Eau Claire and Lake Wissota around 840 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Bateman, Eau Claire Airport and Seymour.

# 

# 

This includes U.S. Highway 53 between mile markers 89 and 97.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 4484 9160 4493 9156 4494 9126 4476 9129
TIME...MOT...LOC 0119Z 287DEG 18KT 4487 9151 

TORNADO...OBSERVED
HAIL...<.75IN

$$

JRB

2 follow-up statements

710 
WWUS53 KMPX 220132
SVSMPX

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

WIC017-035-220200-
/O.CON.KMPX.TO.W.0027.000000T0000Z-200722T0200Z/
Chippewa WI-Eau Claire WI-
832 PM CDT Tue Jul 21 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 PM CDT FOR SOUTH
CENTRAL CHIPPEWA AND NORTHWESTERN EAU CLAIRE COUNTIES...
    
At 832 PM CDT, a confirmed tornado was located near Eau Claire, 
moving east at 15 mph.

HAZARD...Damaging tornado.

SOURCE...Weather spotters confirmed tornado.

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 tornado will be near...
  Lake Hallie around 835 PM CDT.
  Chippewa Falls and Altoona around 840 PM CDT.
  Eau Claire around 855 PM CDT.
  Lake Wissota around 900 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Bateman, Eau Claire Airport and Seymour.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 4483 9156 4493 9154 4494 9126 4476 9129
TIME...MOT...LOC 0132Z 276DEG 13KT 4487 9149 

TORNADO...OBSERVED
HAIL...<.75IN

$$

JRB

957 
WWUS53 KMPX 220143
SVSMPX

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

WIC017-035-220200-
/O.CON.KMPX.TO.W.0027.000000T0000Z-200722T0200Z/
Chippewa WI-Eau Claire WI-
843 PM CDT Tue Jul 21 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 900 PM CDT FOR SOUTH
CENTRAL CHIPPEWA AND NORTHWESTERN EAU CLAIRE COUNTIES...
    
At 843 PM CDT, a confirmed tornado was located over Eau Claire,
moving east at 20 mph.

HAZARD...Damaging tornado.

SOURCE...Weather spotters confirmed tornado.

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 tornado will be near...
  Lake Wissota around 850 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Bateman, Eau Claire Airport and Seymour.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

To repeat, a tornado is on the ground. 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 4481 9150 4493 9148 4494 9126 4476 9129
TIME...MOT...LOC 0143Z 287DEG 18KT 4485 9141 

TORNADO...OBSERVED
HAIL...<.75IN

$$

JRB

The office that day

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

Issued	Product	Office	Counties	Lasted
Jul 21, 7:03 PM CDT	Tornado Warning	MPX	Chippewa	42 min
Jul 21, 7:10 PM CDT	Special Weather Statement	MPX	Rusk	65 min
Jul 21, 7:18 PM CDT	Special Weather Statement	MPX	Dunn	57 min
Jul 21, 7:34 PM CDT	Special Weather Statement	MPX	Chippewa	56 min
Jul 21, 7:47 PM CDT	Special Weather Statement	MPX	Chippewa	43 min
Jul 21, 8:30 PM CDT	Special Weather Statement	MPX	Chippewa, Eau Claire	60 min
Jul 21, 8:52 PM CDT	Tornado Warning Tornado observed	MPX	Chippewa, Eau Claire	53 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.