Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 26, NWS La Crosse, WI

June 17, 2021Buffalo County, Trempealeau County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Jun 17, 2021, 6:20 PM CDT for Buffalo County, Trempealeau County, Wisconsin. It was in force for 25 min. 1 report 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: Jun 17, 2021, 6:20 PM CDT (23:20 UTC)
Expired: Jun 17, 2021, 6:45 PM CDT
In force: 25 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Buffalo County, WI, Trempealeau County, WI

The radar

The La Crosse radar (KARX), 95 km from the middle of the area, began a volume at 23:21 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
Jun 17, 6:39 PM CDT	HAIL 0.25	Mondovi, WI

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
Jun 17, 3:50 PM CDT	Severe Thunderstorm Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.3 hours before the alert went out and 141 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: 288 J/kg
Mixed-layer CIN: -583 J/kg
Mixed-layer LCL: 1902 m above ground
0-6 km bulk shear: 46 kt
0-1 km storm-relative helicity: 108 m²/s²
0-3 km storm-relative helicity: 223 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 4.0

Open this sounding in Storm Lab

The text

As transmitted.

418 
WUUS53 KARX 172320
SVRARX
WIC011-121-172345-
/O.NEW.KARX.SV.W.0026.210617T2320Z-210617T2345Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
620 PM CDT Thu Jun 17 2021

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  Northern Buffalo County in west central Wisconsin...
  Northwestern Trempealeau County in west central Wisconsin...

* Until 645 PM CDT.

* At 620 PM CDT, a severe thunderstorm was located near Durand, or 13
  miles north of Wabasha, moving east at 50 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...
  Modena around 630 PM CDT.
  Mondovi around 635 PM CDT.
  Strum around 645 PM CDT.

Other locations impacted by this severe thunderstorm include
Gilmanton, Nelson, Maxville, Mondovi Airfield, Misha Mokwa, County
Roads F And K K and The Big Swamp Area.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4451 9204 4454 9205 4459 9203 4460 9200
      4460 9138 4433 9147 4443 9208
TIME...MOT...LOC 2320Z 273DEG 44KT 4456 9196 

HAIL...1.00IN
WIND...60MPH
 
$$

Skow

1 follow-up statement

845 
WWUS53 KARX 172341
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
641 PM CDT Thu Jun 17 2021

WIC011-121-172351-
/O.EXP.KARX.SV.W.0026.000000T0000Z-210617T2345Z/
Buffalo WI-Trempealeau WI-
641 PM CDT Thu Jun 17 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHERN BUFFALO AND
NORTHWESTERN TREMPEALEAU COUNTIES WILL EXPIRE AT 645 PM CDT...
                
The storm which prompted the warning has weakened below severe
limits, and no longer poses an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However small hail
and gusty winds are still possible with this thunderstorm.

A Severe Thunderstorm Watch remains in effect until 1000 PM CDT for
west central Wisconsin.

LAT...LON 4451 9204 4454 9205 4459 9203 4460 9200
      4460 9138 4433 9147 4443 9208
TIME...MOT...LOC 2341Z 273DEG 44KT 4455 9163 

$$

Skow

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 17, 3:34 AM CDT	Special Weather Statement	ARX	Buffalo, Trempealeau	56 min
Jun 17, 4:10 AM CDT	Severe Thunderstorm Warning	ARX	Buffalo, Trempealeau	17 min
Jun 17, 5:36 AM CDT	Special Weather Statement	ARX	Grant	24 min
Jun 17, 5:42 AM CDT	Severe Thunderstorm Warning	ARX	Juneau, Monroe, Richland, Vernon	33 min
Jun 17, 3:36 PM CDT	Special Weather Statement	ARX	Adams	24 min
Jun 17, 5:56 PM CDT	Special Weather Statement	ARX	Trempealeau	34 min
Jun 17, 6:43 PM CDT	Severe Thunderstorm Warning	ARX	Clark	47 min
Jun 17, 6:50 PM CDT	Special Weather Statement	ARX	Trempealeau	25 min
Jun 17, 6:59 PM CDT	Severe Thunderstorm Warning	ARX	Buffalo, Jackson, Trempealeau	46 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.