Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 21, NWS La Crosse, WI

June 2, 2020Allamakee County, Iowa; Crawford County, Vernon County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Jun 2, 2020, 7:07 PM CDT for Allamakee County, Iowa; Crawford County, Vernon 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: Jun 2, 2020, 7:07 PM CDT (00:07 UTC)
Expired: Jun 2, 2020, 8:00 PM CDT
In force: 53 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Allamakee County, IA, Crawford County, WI, Vernon County, WI

The radar

The La Crosse radar (KARX), 70 km from the middle of the area, began a volume at 00:09 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 2, 7:15 PM CDT	TSTM WND GST 63	1 Nnw Viroqua, WI	63.3 MPH REPORTED AT AIRPORT AWOS.
Jun 2, 7:22 PM CDT	TSTM WND DMG	Gays Mills, WI	SEVERAL LARGE TREES 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
Jun 2, 4:39 PM CDT	Severe Thunderstorm Watch	SPC	5 hr

The nearest sounding before it

Davenport, (KDVN), launched 00:00Z, 0.1 hours before the alert went out and 182 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: 1087 J/kg
Mixed-layer CIN: -286 J/kg
Mixed-layer LCL: 1870 m above ground
0-6 km bulk shear: 13 kt
0-1 km storm-relative helicity: 44 m²/s²
0-3 km storm-relative helicity: 142 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

553 
WUUS53 KARX 030007
SVRARX
IAC005-WIC023-123-030100-
/O.NEW.KARX.SV.W.0021.200603T0007Z-200603T0100Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
707 PM CDT Tue Jun 2 2020

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  Allamakee County in northeastern Iowa...
  Southwestern Vernon County in southwestern Wisconsin...
  Crawford County in southwestern Wisconsin...

* Until 800 PM CDT.

* At 706 PM CDT, severe thunderstorms were located along a line
  extending from La Farge to near Lansing to 6 miles southeast of
  Mabel, moving southeast at 45 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.

* Severe thunderstorms will be near...
  Lansing around 710 PM CDT.
  Waukon and Harpers Ferry around 725 PM CDT.
  Postville around 740 PM CDT.

Other locations impacted by these severe thunderstorms include
Volney, County Roads A 52 And W 60, Eastman, Horrigan Ridge,
Quandahl, Watson and Red Barn Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4308 9118 4308 9161 4350 9161 4350 9122
      4366 9072 4355 9065 4355 9067 4317 9067
      4317 9069 4312 9074 4308 9085 4306 9094
      4303 9097 4299 9106 4300 9113 4299 9116
TIME...MOT...LOC 0006Z 330DEG 38KT 4358 9064 4341 9116 4346 9166 

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

Lee

2 follow-up statements

880 
WWUS53 KARX 030023
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
723 PM CDT Tue Jun 2 2020

IAC005-WIC023-123-030100-
/O.CON.KARX.SV.W.0021.000000T0000Z-200603T0100Z/
Allamakee IA-Vernon WI-Crawford WI-
723 PM CDT Tue Jun 2 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 800 PM CDT
FOR ALLAMAKEE...SOUTHWESTERN VERNON AND CRAWFORD COUNTIES...

At 722 PM CDT, severe thunderstorms were located along a line
extending from 9 miles northwest of Richland Center to 6 miles
northeast of Harpers Ferry to near Waukon, moving southeast at 45
mph. At 715 PM a 63 mph wind gust was reported at Viroqua.

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.

These severe storms will be near...
  Postville around 740 PM CDT.

Other locations impacted by these severe thunderstorms include
Volney, County Roads A 52 And W 60, Eastman, Horrigan Ridge,
Quandahl, Watson and Red Barn Campground.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4308 9118 4308 9161 4350 9161 4350 9122
      4366 9072 4355 9065 4355 9067 4317 9067
      4317 9069 4312 9074 4308 9085 4306 9094
      4303 9097 4299 9106 4300 9113 4299 9116
TIME...MOT...LOC 0022Z 330DEG 38KT 4344 9053 4327 9105 4332 9155 

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

Lee

312 
WWUS53 KARX 030059
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
759 PM CDT Tue Jun 2 2020

IAC005-WIC023-123-030109-
/O.EXP.KARX.SV.W.0021.000000T0000Z-200603T0100Z/
Allamakee IA-Vernon WI-Crawford WI-
759 PM CDT Tue Jun 2 2020

...THE SEVERE THUNDERSTORM WARNING FOR ALLAMAKEE...SOUTHWESTERN
VERNON AND CRAWFORD COUNTIES WILL EXPIRE AT 800 PM CDT...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning will be allowed to expire.  However gusty
winds are still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until midnight CDT for
northeastern Iowa...southeastern Minnesota...and southwestern
Wisconsin.

LAT...LON 4308 9118 4308 9161 4350 9161 4350 9122
      4366 9072 4355 9065 4355 9067 4317 9067
      4317 9069 4312 9074 4308 9085 4306 9094
      4303 9097 4299 9106 4300 9113 4299 9116
TIME...MOT...LOC 0059Z 330DEG 38KT 4311 9027 4294 9079 4299 9129 

$$

Lee

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 2, 7:55 PM CDT	Severe Thunderstorm Warning	ARX	Chickasaw, Floyd, Howard, Mitchell	50 min
Jun 2, 8:06 PM CDT	Special Weather Statement	ARX	Clayton, Fayette	54 min
Jun 2, 8:31 PM CDT	Special Weather Statement	ARX	Allamakee	59 min
Jun 2, 8:54 PM CDT	Special Weather Statement	ARX	Mitchell	66 min
Jun 2, 9:11 PM CDT	Special Weather Statement	ARX	Allamakee, Winneshiek	64 min
Jun 2, 9:27 PM CDT	Special Weather Statement	ARX	Howard	33 min
Jun 2, 10:02 PM CDT	Special Weather Statement	ARX	Allamakee, Winneshiek	43 min
Jun 2, 11:46 PM CDT	Special Weather Statement	ARX	Clayton	59 min
Jun 2, 8:40 PM CDT	Special Weather Statement	ARX	Trempealeau	50 min
Jun 2, 8:57 PM CDT	Special Weather Statement	ARX	La Crosse	63 min
Jun 2, 9:12 PM CDT	Areal Flood Advisory	ARX	La Crosse	87 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2020 Severe Thunderstorm Warnings in Iowa, 2020 Every severe thunderstorm warning 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.