Alert archive / Wisconsin / Tornado Warnings in 2020

Tornado Warning 28, NWS Twin Cities, MN

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

NWS Twin Cities, MN issued this tornado warning at Jul 21, 2020, 8:52 PM CDT for Chippewa County, Eau Claire County, Wisconsin. It was in force for 53 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, 8:52 PM CDT (01:52 UTC)
Expired: Jul 21, 2020, 9:45 PM CDT
In force: 53 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), 115 km from the middle of the area, began a volume at 01:52 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, 8:53 PM CDT	TORNADO	Cadott, WI	A TORNADO WAS CONFIRMED MOVING THROUGH THE TOWN OF CADOTT. THE SPOTTER NOTED POWER FLASHES AS IT WENT THROUGH THE TOWN. LAW ENFORCEMENT OFFICIALS ARE IN ROUTE.
Jul 21, 8:55 PM CDT	TORNADO	Cadott, WI	THE LOCAL LAW ENFORCEMENT OFFICIALS AND SPOTTERS INDICATED THAT DAMAGE OCCURRED ON THE NORTH SIDE OF THE VILLAGE OF CADOTT, MAINLY NORTH OF THE RAILROAD TRACK AND WEST OF HIGHWAY 27. THERE WAS ROOF DAMAGE TO A CHURCH AND A BUILDING. ALSO, SEVERAL TREES AND POW

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, 1.9 hours before the alert went out and 194 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.

357 
WFUS53 KMPX 220152
TORMPX
WIC017-035-220245-
/O.NEW.KMPX.TO.W.0028.200722T0152Z-200722T0245Z/

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

The National Weather Service in The Twin Cities has issued a

* Tornado Warning for...
  Southeastern Chippewa County in west central Wisconsin...
  Northeastern Eau Claire County in west central Wisconsin...

* Until 945 PM CDT.

* At 852 PM CDT, a confirmed tornado was located near Lake Wissota,
  or 9 miles east of Eau Claire, moving east at 25 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...
  Cadott around 905 PM CDT.
  Boyd around 920 PM CDT.
  Stanley around 935 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Bateman and Ludington.

# 

# 

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 4482 9135 4496 9134 4498 9092 4478 9092
      4477 9093
TIME...MOT...LOC 0152Z 268DEG 20KT 4488 9126 

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

$$

JRB

4 follow-up statements

969 
WWUS53 KMPX 220207
SVSMPX

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

WIC017-035-220245-
/O.CON.KMPX.TO.W.0028.000000T0000Z-200722T0245Z/
Chippewa WI-Eau Claire WI-
907 PM CDT Tue Jul 21 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 945 PM CDT FOR
SOUTHEASTERN CHIPPEWA AND NORTHEASTERN EAU CLAIRE COUNTIES...
    
At 907 PM CDT, a confirmed tornado was located near Cadott, or 15
miles east of Eau Claire, moving east at 25 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...
  Boyd around 920 PM CDT.
  Stanley around 935 PM CDT.

Other locations impacted by this tornadic thunderstorm include
Bateman and Ludington.

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.

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

&&

LAT...LON 4482 9135 4496 9134 4498 9092 4478 9092
      4477 9093
TIME...MOT...LOC 0207Z 269DEG 20KT 4488 9114 

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

$$

JRB

636 
WWUS53 KMPX 220217
SVSMPX

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

WIC017-035-220245-
/O.CON.KMPX.TO.W.0028.000000T0000Z-200722T0245Z/
Chippewa WI-Eau Claire WI-
917 PM CDT Tue Jul 21 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 945 PM CDT FOR
SOUTHEASTERN CHIPPEWA AND NORTHEASTERN EAU CLAIRE COUNTIES...
    
At 916 PM CDT, a severe thunderstorm capable of producing a tornado
was located 7 miles south of Boyd, or 22 miles east of Eau Claire,
moving east at 30 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
southeastern Chippewa and northeastern Eau Claire Counties, including
the following locations... Ludington.

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.

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

&&

LAT...LON 4480 9119 4491 9116 4494 9092 4478 9092
      4477 9093
TIME...MOT...LOC 0216Z 270DEG 27KT 4486 9099 

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

$$

JRB

028 
WWUS53 KMPX 220231
SVSMPX

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

WIC017-220241-
/O.CAN.KMPX.TO.W.0028.000000T0000Z-200722T0245Z/
Chippewa WI-
931 PM CDT Tue Jul 21 2020

...THE TORNADO WARNING FOR SOUTHEASTERN CHIPPEWA COUNTY IS
CANCELLED...
    
The tornadic thunderstorm which prompted the warning has moved out 
of the warned area Therefore, the warning has been cancelled.

LAT...LON 4479 9111 4485 9108 4486 9092 4478 9092
      4477 9093
TIME...MOT...LOC 0231Z 278DEG 34KT 4479 9099 

$$

WIC035-220245-
/O.CON.KMPX.TO.W.0028.000000T0000Z-200722T0245Z/
Eau Claire WI-
931 PM CDT Tue Jul 21 2020

...A TORNADO WARNING REMAINS IN EFFECT UNTIL 945 PM CDT FOR
NORTHEASTERN EAU CLAIRE COUNTY...
    
At 931 PM CDT, a severe thunderstorm capable of producing a tornado
was located 9 miles northeast of Augusta, or 22 miles east of Eau
Claire, moving east at 40 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 Eau Claire 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.

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

&&

LAT...LON 4479 9111 4485 9108 4486 9092 4478 9092
      4477 9093
TIME...MOT...LOC 0231Z 278DEG 34KT 4479 9099 

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

$$

JRB

023 
WWUS53 KMPX 220241
SVSMPX

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

WIC035-220251-
/O.EXP.KMPX.TO.W.0028.000000T0000Z-200722T0245Z/
Eau Claire WI-
941 PM CDT Tue Jul 21 2020

...THE TORNADO WARNING FOR NORTHEASTERN EAU CLAIRE COUNTY WILL EXPIRE
AT 945 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.

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 4479 9111 4485 9108 4486 9092 4478 9092
      4477 9093
TIME...MOT...LOC 0241Z 268DEG 20KT 4479 9091 

$$

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, 8:19 PM CDT	Tornado Warning Tornado observed	MPX	Chippewa, Eau Claire	41 min
Jul 21, 8:30 PM CDT	Special Weather Statement	MPX	Chippewa, Eau Claire	60 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.