Alert archive / Wisconsin / Tornado Warnings in 2021
Tornado Warning 9, NWS La Crosse, WI
NWS La Crosse, WI issued this tornado warning at Aug 11, 2021, 1:01 PM CDT for Clark County, Wisconsin. It was in force for 17 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
- Aug 11, 2021, 1:01 PM CDT (18:01 UTC)
- Expired
- Aug 11, 2021, 1:18 PM CDT
- In force
- 17 min
- Issued by
- NWS La Crosse, WI
- Area
- Storm-based polygon
- Tornado
- Radar indicated
- Hail
- 1.0 in
County Clark County, WI
The radar
The La Crosse radar (KARX), 134 km from the middle of the area, began a volume at 18:04 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 |
|---|---|---|---|
| Aug 11, 12:17 PM CDT | Tornado Watch | SPC | 8 hr |
The nearest sounding before it
Green Bay/Straub, WI (KGRB), launched 12:00Z, 6.0 hours before the alert went out and 187 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.
- Mixed-layer CAPE
- 1499 J/kg
- Mixed-layer CIN
- -136 J/kg
- Mixed-layer LCL
- 678 m above ground
- 0-6 km bulk shear
- 41 kt
- 0-1 km storm-relative helicity
- 156 m²/s²
- 0-3 km storm-relative helicity
- 206 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 2.1
The text
As transmitted.
986
WFUS53 KARX 111801
TORARX
WIC019-111830-
/O.NEW.KARX.TO.W.0009.210811T1801Z-210811T1830Z/
BULLETIN - EAS ACTIVATION REQUESTED
Tornado Warning
National Weather Service La Crosse WI
101 PM CDT Wed Aug 11 2021
The National Weather Service in La Crosse has issued a
* Tornado Warning for...
Northeastern Clark County in central Wisconsin...
* Until 130 PM CDT.
* At 101 PM CDT, a severe thunderstorm capable of producing a tornado
was located near Colby, or 17 miles south of Medford, moving east
at 55 mph.
HAZARD...Tornado and quarter size hail.
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 dangerous storm will be near...
Colby around 105 PM CDT.
Abbotsford around 110 PM CDT.
Other locations impacted by this tornadic thunderstorm include
Curtiss, Colby, Atwood and Unity.
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 4484 9032 4482 9051 4493 9054 4499 9031
TIME...MOT...LOC 1801Z 258DEG 49KT 4489 9043
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
$$
JSB4 follow-up statements
517
WWUS53 KARX 111805
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
105 PM CDT Wed Aug 11 2021
WIC019-111830-
/O.CON.KARX.TO.W.0009.000000T0000Z-210811T1830Z/
Clark WI-
105 PM CDT Wed Aug 11 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 130 PM CDT FOR
NORTHEASTERN CLARK COUNTY...
At 104 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Colby, or 16 miles south of Medford, moving east at
55 mph.
HAZARD...Tornado and quarter size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4484 9032 4483 9047 4493 9049 4499 9031
TIME...MOT...LOC 1804Z 258DEG 49KT 4490 9036
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
$$
JSB936
WWUS53 KARX 111809
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
109 PM CDT Wed Aug 11 2021
WIC019-111830-
/O.CON.KARX.TO.W.0009.000000T0000Z-210811T1830Z/
Clark WI-
109 PM CDT Wed Aug 11 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 130 PM CDT FOR
NORTHEASTERN CLARK COUNTY...
At 109 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Colby, or 18 miles south of Medford, moving east at
50 mph.
HAZARD...Tornado and quarter size hail.
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 Clark County, including the following locations... Colby
and Unity.
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 4483 9044 4493 9045 4495 9032 4484 9032
TIME...MOT...LOC 1809Z 264DEG 41KT 4487 9033
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
$$
JSB529
WWUS53 KARX 111814
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
114 PM CDT Wed Aug 11 2021
WIC019-111830-
/O.CON.KARX.TO.W.0009.000000T0000Z-210811T1830Z/
Clark WI-
114 PM CDT Wed Aug 11 2021
...A TORNADO WARNING REMAINS IN EFFECT UNTIL 130 PM CDT FOR
NORTHEASTERN CLARK COUNTY...
At 113 PM CDT, a severe thunderstorm capable of producing a tornado
was located over Colby, or 18 miles south of Medford, moving east at
45 mph.
HAZARD...Tornado and half dollar size hail.
SOURCE...Radar indicated rotation.
IMPACT...Flying debris will be dangerous to those caught without
shelter. Mobile homes will be damaged or destroyed. Damage
to roofs, windows, and vehicles will occur. Tree damage is
likely.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
TAKE COVER NOW! Move to a basement or an interior room on the lowest
floor of a sturdy building. Avoid windows. If you are outdoors, in a
mobile home, or in a vehicle, move to the closest substantial shelter
and protect yourself from flying debris.
&&
LAT...LON 4483 9044 4493 9045 4495 9032 4484 9032
TIME...MOT...LOC 1813Z 264DEG 37KT 4487 9030
TORNADO...RADAR INDICATED
MAX HAIL SIZE...1.25 IN
$$
JSB042
WWUS53 KARX 111818
SVSARX
Severe Weather Statement
National Weather Service La Crosse WI
118 PM CDT Wed Aug 11 2021
WIC019-111828-
/O.CAN.KARX.TO.W.0009.000000T0000Z-210811T1830Z/
Clark WI-
118 PM CDT Wed Aug 11 2021
...THE TORNADO WARNING FOR NORTHEASTERN CLARK COUNTY IS CANCELLED...
The storm which prompted the warning has moved out of the area.
Therefore, the warning has been cancelled.
A Tornado Watch remains in effect until 800 PM CDT for central
Wisconsin.
To report severe weather, contact your nearest law enforcement
agency. They will relay your report to the National Weather Service
La Crosse.
LAT...LON 4483 9044 4493 9045 4495 9032 4484 9032
TIME...MOT...LOC 1817Z 258DEG 49KT 4489 9020
$$
JSBThe office that day
Everything else NWS La Crosse, WI issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 9:19 PM CDT | River Flood Warning | ARX | La Crosse, Trempealeau | 30 hr |
| Aug 11, 11:32 AM CDT | Special Weather Statement | ARX | Taylor | 28 min |
| Aug 11, 11:57 AM CDT | Special Weather Statement | ARX | Clark, Taylor | 33 min |
| Aug 11, 12:18 PM CDT | Severe Thunderstorm Warning | ARX | Taylor | 42 min |
| Aug 11, 12:31 PM CDT | Special Weather Statement | ARX | Clark, Jackson, La Crosse, Monroe | 59 min |
| Aug 11, 1:07 PM CDT | Severe Thunderstorm Warning | ARX | La Crosse, Monroe | 38 min |
| Aug 11, 1:41 PM CDT | Severe Thunderstorm Warning | ARX | Juneau, Monroe | 64 min |
| Aug 11, 1:48 PM CDT | Tornado Warning | ARX | Juneau, Monroe | 42 min |
| Aug 11, 2:06 PM CDT | Severe Thunderstorm Warning | ARX | La Crosse, Monroe | 39 min |
| Aug 11, 2:18 PM CDT | Severe Thunderstorm Warning | ARX | La Crosse, Monroe, Vernon | 42 min |
| Aug 11, 2:20 PM CDT | Tornado Warning | ARX | Adams, Juneau, Monroe | 55 min |
| Aug 11, 2:32 PM CDT | Severe Thunderstorm Warning | ARX | Monroe | 28 min |
| Aug 11, 3:06 PM CDT | Severe Thunderstorm Warning | ARX | Richland, Vernon | 54 min |
| Aug 11, 4:19 PM CDT | Special Weather Statement | ARX | Grant | 26 min |
| Aug 11, 4:23 PM CDT | Severe Thunderstorm Warning | ARX | Grant | 22 min |
Nearby
Tornado Warnings in Wisconsin, 2021Every tornado warning in 2021Tornadoes 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.