Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 111, NWS La Crosse, WI

December 15, 20215 counties in Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Dec 15, 2021, 8:24 PM CST for 5 counties in Wisconsin. It was in force for 81 min. 15 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: Dec 15, 2021, 8:24 PM CST (02:24 UTC)
Expired: Dec 15, 2021, 9:45 PM CST
In force: 81 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Tornado: Possible
Damage threat: Destructive
Hail: 0.75 in
Wind: 80.0 mph

Counties Clark County, WI, Jackson County, WI, La Crosse County, WI, Monroe County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 25 km from the middle of the area, began a volume at 02:26 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
Dec 15, 8:51 PM CST	TSTM WND DMG	2 Nw Melrose, WI	HOUSE DAMAGED
Dec 15, 8:51 PM CST	TSTM WND DMG	2 Nw Melrose, WI	HOUSE DAMAGED.
Dec 15, 8:51 PM CST	TSTM WND DMG	5 Se Osseo, WI	TREES DOWN.
Dec 15, 8:55 PM CST	TSTM WND GST 43	Black River Falls, WI
Dec 15, 9:11 PM CST	TSTM WND DMG	Sparta, WI	DOOR OVERHANDS DAMAGED
Dec 15, 9:11 PM CST	TSTM WND DMG	Sparta, WI	DOOR OVERHANDS DAMAGED.
Dec 15, 9:12 PM CST	NON-TSTM WND GST 56	4 Ene Sparta, WI	AWOS STATION KCMY SPARTA/FORT MCCOY AIRPORT.
Dec 15, 9:15 PM CST	FUNNEL CLOUD	6 N Chili, WI
Dec 15, 9:15 PM CST	TSTM WND GST 69	Viroqua, WI
Dec 15, 9:15 PM CST	NON-TSTM WND GST 69	2 Nnw Viroqua, WI	AWOS STATION KY51 VIROQUA MUNICIPAL AIRPORT.
Dec 15, 9:21 PM CST	TSTM WND DMG	Neillsville, WI	POWER LINES ACROSS ROAD, TREE DAMAGE, DEBRIS FROM DAMAGED ROOF.
Dec 15, 9:24 PM CST	TSTM WND DMG	Neillsville, WI	TREES AND POWER LINES DOWN ACROSS ROADS, DEBRIS FROM DAMAGE ROOF.
Dec 15, 9:28 PM CST	TSTM WND DMG	Tomah, WI	MULTIPLE LARGE TREES WERE UPROOTED AND FELL ON STRUCTURES AND VEHICLES IN TOMAH. ONE CAUSED A GAS LINE RUPTURE. MANY OTHER REPORTS OF TREES AND POWER LINES DOWN ACROSS THE COUNTY.
Dec 15, 9:30 PM CST	TSTM WND DMG	Tomah, WI	POWER LINES BLOWN DOWN
Dec 15, 9:30 PM CST	TSTM WND DMG	Tomah, WI	POWER LINES BLOWN DOWN.

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

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, 2.4 hours before the alert went out and 227 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.

197 
WUUS53 KARX 160224
SVRARX
WIC019-053-063-081-123-160345-
/O.NEW.KARX.SV.W.0111.211216T0224Z-211216T0345Z/

BULLETIN - EAS ACTIVATION REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
824 PM CST Wed Dec 15 2021

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  Eastern La Crosse County in west central Wisconsin...
  Southern Clark County in central Wisconsin...
  Jackson County in west central Wisconsin...
  Vernon County in southwestern Wisconsin...
  Monroe County in west central Wisconsin...

* Until 945 PM CST.

* At 823 PM CST, severe thunderstorms were located along a line
  extending from 6 miles northwest of Modena to Galesville to 6 miles
  southwest of Stoddard, moving northeast at 75 mph.

  THESE ARE DESTRUCTIVE STORMS.

  HAZARD...80 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Flying debris will be dangerous to those caught without 
           shelter. Mobile homes will be heavily damaged. Expect 
           considerable damage to roofs, windows, and vehicles. 
           Extensive tree damage and power outages are likely.

* Severe thunderstorms will be near...
  Coon Valley around 835 PM CST.
  West Salem around 840 PM CST.
  Bangor around 845 PM CST.
  Sparta around 850 PM CST.
  
PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for southeastern
Minnesota...and central, southwestern and west central Wisconsin.

For your protection move to an interior room on the lowest floor of a
building.

This is an EXTREMELY DANGEROUS SITUATION. These storms are producing 
widespread wind damage. SEEK SHELTER NOW inside a sturdy structure 
and stay away from windows!


&&

LAT...LON 4355 9124 4358 9123 4361 9127 4373 9125
      4372 9113 4459 9117 4460 9092 4478 9092
      4478 9032 4355 9032
TIME...MOT...LOC 0223Z 221DEG 66KT 4451 9190 4410 9136 4360 9133 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...DESTRUCTIVE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...80 MPH

$$

Rieck

2 follow-up statements

446 
WWUS53 KARX 160323
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
923 PM CST Wed Dec 15 2021

WIC063-160333-
/O.CAN.KARX.SV.W.0111.000000T0000Z-211216T0345Z/
La Crosse WI-
923 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR EASTERN LA CROSSE COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Tornado Watch remains in effect until 1100 PM CST for central,
southwestern and west central Wisconsin.

LAT...LON 4355 9090 4372 9090 4429 9091 4460 9092
      4478 9092 4478 9032 4355 9032
TIME...MOT...LOC 0323Z 221DEG 66KT 4531 9092 4489 9038 4439 9036 

$$

WIC019-053-081-123-160345-
/O.CON.KARX.SV.W.0111.000000T0000Z-211216T0345Z/
Clark WI-Jackson WI-Vernon WI-Monroe WI-
923 PM CST Wed Dec 15 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 945 PM CST
FOR SOUTHERN CLARK...CENTRAL JACKSON...NORTHEASTERN VERNON AND MONROE
COUNTIES...

At 923 PM CST, severe thunderstorms were located along a line
extending from Sheldon to near Colby to 10 miles southeast of
Shortville, moving northeast at 75 mph.

HAZARD...70 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect considerable tree damage. Damage is likely to mobile 
         homes, roofs, and outbuildings.

These severe thunderstorms will remain over mainly rural areas of
southern Clark, central Jackson, northeastern Vernon and Monroe 
Counties, including the following locations...Potters Flowage, Lynn, 
Glendale and Trippville.


PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect until 1100 PM CST for central,
southwestern and west central Wisconsin.

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 4355 9090 4372 9090 4429 9091 4460 9092
      4478 9092 4478 9032 4355 9032
TIME...MOT...LOC 0323Z 221DEG 66KT 4531 9092 4489 9038 4439 9036 

TORNADO...POSSIBLE
THUNDERSTORM DAMAGE THREAT...CONSIDERABLE
HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...<.75 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...70 MPH

$$

Rieck

586 
WWUS53 KARX 160343
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
943 PM CST Wed Dec 15 2021

WIC019-053-081-123-160353-
/O.EXP.KARX.SV.W.0111.000000T0000Z-211216T0345Z/
Clark WI-Jackson WI-Vernon WI-Monroe WI-
943 PM CST Wed Dec 15 2021

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN CLARK...CENTRAL
JACKSON...NORTHEASTERN VERNON AND MONROE COUNTIES WILL EXPIRE AT 945
PM CST...
    
The storms which prompted the warning have moved out of the area.
Therefore, the warning will be allowed to expire.

A Tornado Watch remains in effect until 1100 PM CST for central,
southwestern and west central Wisconsin.

LAT...LON 4355 9090 4372 9090 4429 9091 4460 9092
      4478 9092 4478 9032 4355 9032
TIME...MOT...LOC 0343Z 221DEG 66KT 4556 9061 4514 9007 4464 9005 

$$

Rieck

The office that day

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

Issued	Product	Office	Counties	Lasted
Dec 15, 7:53 PM CST	Severe Thunderstorm Warning Destructive damage threat	ARX	Buffalo, La Crosse, Trempealeau	67 min
Dec 15, 7:58 PM CST	Tornado Warning	ARX	Buffalo, Trempealeau	47 min
Dec 15, 8:01 PM CST	Tornado Warning	ARX	Buffalo	44 min
Dec 15, 8:16 PM CST	Severe Thunderstorm Warning Considerable damage threat	ARX	Crawford, Grant, Vernon	74 min
Dec 15, 9:05 PM CST	Severe Thunderstorm Warning	ARX	Clark	25 min
Dec 15, 9:07 PM CST	Tornado Warning	ARX	Clark	38 min
Dec 15, 9:08 PM CST	Severe Thunderstorm Warning Considerable damage threat	ARX	Grant, Richland	52 min
Dec 15, 9:17 PM CST	Severe Thunderstorm Warning	ARX	Taylor	43 min
Dec 15, 9:28 PM CST	Severe Thunderstorm Warning	ARX	Clark	16 min
Dec 15, 9:32 PM CST	Tornado Warning	ARX	Clark, Taylor	28 min
Dec 15, 9:33 PM CST	Severe Thunderstorm Warning	ARX	Adams, Juneau	72 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2021 Every severe thunderstorm warning 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; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.