Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 83, NWS La Crosse, WI

August 11, 2021Monroe County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Aug 11, 2021, 2:32 PM CDT for Monroe County, Wisconsin. It was in force for 28 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, 2:32 PM CDT (19:32 UTC)
Expired: Aug 11, 2021, 3:00 PM CDT
In force: 28 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

County Monroe County, WI

The radar

The La Crosse radar (KARX), 48 km from the middle of the area, began a volume at 19:35 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, 7.5 hours before the alert went out and 209 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: 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

Open this sounding in Storm Lab

The text

As transmitted.

467 
WUUS53 KARX 111932
SVRARX
WIC081-112000-
/O.NEW.KARX.SV.W.0083.210811T1932Z-210811T2000Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
232 PM CDT Wed Aug 11 2021

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  Southeastern Monroe County in west central Wisconsin...

* Until 300 PM CDT.

* At 231 PM CDT, a severe thunderstorm was located 7 miles south of
  Fort Mc Coy, or 7 miles east of Sparta, moving east at 40 mph.

  HAZARD...60 mph wind gusts and quarter size hail.

  SOURCE...Radar indicated.

  IMPACT...Hail damage to vehicles is expected. Expect wind damage 
           to roofs, siding, and trees.

* This severe thunderstorm will be near...
  Tomah around 245 PM CDT.

Other locations impacted by this severe thunderstorm include Jackson
Pass, Wilton, Clifton, Oakdale, Tunnel City, Highway 131 And County A
and Wyeville.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A Tornado Watch remains in effect for the warned area. Tornadoes can 
develop quickly from severe thunderstorms. Although a tornado is not 
immediately likely, if one is spotted, act quickly and move to a 
place of safety inside a sturdy structure such as a basement or 
small interior room.

&&

LAT...LON 4381 9078 4398 9080 4405 9031 4381 9031
TIME...MOT...LOC 1931Z 265DEG 34KT 4391 9065 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JSB

1 follow-up statement

208 
WWUS53 KARX 111949
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
249 PM CDT Wed Aug 11 2021

WIC081-112000-
/O.CON.KARX.SV.W.0083.000000T0000Z-210811T2000Z/
Monroe WI-
249 PM CDT Wed Aug 11 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 300 PM CDT
FOR EAST CENTRAL MONROE COUNTY...

At 248 PM CDT, a severe thunderstorm was located near Tomah, moving
east at 40 mph.

HAZARD...60 mph wind gusts and quarter size hail.

SOURCE...Radar indicated.

IMPACT...Hail damage to vehicles is expected. Expect wind damage to 
         roofs, siding, and trees.

This includes the following highways...
 Interstate 94 between mile markers 145 and 147.
 Interstate 90/94 between mile markers 46 and 52.
 Interstate 90 in Wisconsin between mile markers 43 and 45.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

A tornado watch remains in effect for the warned area. Tornadoes can 
develop quickly from severe thunderstorms. Although a tornado is not 
immediately likely, if one is spotted act quickly and move to a 
place of safety inside a sturdy structure, such as a basement or 
small interior room.

&&

LAT...LON 4384 9044 4401 9051 4405 9031 4381 9031
TIME...MOT...LOC 1948Z 265DEG 34KT 4392 9042 

HAIL THREAT...RADAR INDICATED
MAX HAIL SIZE...1.00 IN
WIND THREAT...RADAR INDICATED
MAX WIND GUST...60 MPH

$$

JSB

The 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, 1:01 PM CDT	Tornado Warning	ARX	Clark	17 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 Tornado observedConsiderable damage threat	ARX	Adams, Juneau, Monroe	55 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

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; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.