Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2020

Severe Thunderstorm Warning 15, NWS La Crosse, WI

June 2, 20205 counties in Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Jun 2, 2020, 6:25 PM CDT for 5 counties in Wisconsin. It was in force for 50 min. 4 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, 6:25 PM CDT (23:25 UTC)
Expired: Jun 2, 2020, 7:15 PM CDT
In force: 50 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Hail: 1.0 in
Wind: 60.0 mph

Counties Jackson County, WI, Juneau County, WI, La Crosse County, WI, Monroe County, WI, Trempealeau County, WI

The radar

The La Crosse radar (KARX), 84 km from the middle of the area, began a volume at 23:28 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, 6:40 PM CDT	TSTM WND DMG	Sparta, WI	NUMEROUS TREES AND POWER LINES REPORTED DOWN ACROSS THE COUNTY FROM EARLIER STORM. TIME ESTIMATED FROM RADAR.
Jun 2, 6:46 PM CDT	TSTM WND DMG	1 S Tomah, WI	DAMAGE TO TREES, ROOFS, AND SIDING.
Jun 2, 6:46 PM CDT	TSTM WND DMG	2 Ssw Tomah, WI	CANOPY BLOWN OFF TOP OF GRANDSTAND AT COUNTY FAIRGROUNDS. LOTS OF TREE DAMAGE IN AREA AS WELL.
Jun 2, 7:00 PM CDT	TSTM WND DMG	Elroy, WI	SEVERAL LARGE TREES AND BRANCHES WERE BLOWN DOWN IN THE COMMUNITY. A COUPLE OF THESE LARGE BRANCHES FELL ONTO A TRUCK.

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

Did it verify

Verified. The Iowa Environmental Mesonet's Cow matched 4 storm reports to this severe thunderstorm warning; the first came 15 minutes after it went out.

Cow counts a report within 15 km of the polygon while the warning was in force: a tornado for a tornado warning; hail of 1 inch or more, a gust of 58 mph or more or wind damage for a severe thunderstorm warning; a flash flood report for a flash flood warning.

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

Green Bay/Straub, WI (KGRB), launched 12:00Z, 11.4 hours before the alert went out and 174 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: 235 J/kg
Mixed-layer CIN: -406 J/kg
Mixed-layer LCL: 1392 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 223 m²/s²
0-3 km storm-relative helicity: 308 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.0

Open this sounding in Storm Lab

The text

As transmitted.

259 
WUUS53 KARX 022325
SVRARX
WIC053-057-063-081-121-030015-
/O.NEW.KARX.SV.W.0015.200602T2325Z-200603T0015Z/

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

The National Weather Service in La Crosse has issued a

* Severe Thunderstorm Warning for...
  Northeastern La Crosse County in west central Wisconsin...
  Southern Jackson County in west central Wisconsin...
  Juneau County in central Wisconsin...
  Monroe County in west central Wisconsin...
  Southern Trempealeau County in west central Wisconsin...

* Until 715 PM CDT.

* At 624 PM CDT, severe thunderstorms were located along a line
  extending from 10 miles east of Millston to near Fort Mc Coy to
  near Sparta, moving east at 55 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...
  Tomah around 635 PM CDT.
  Necedah around 650 PM CDT.
  New Lisbon around 655 PM CDT.
  Elroy around 700 PM CDT.

Other locations impacted by these severe thunderstorms include New
Miner, Franklin, Shamrock, The Black River Correctional Center, Camp
Decorah, Stevenstown and Potters Flowage.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4416 8993 4417 8997 4413 8998 4412 9001
      4409 9003 4401 9001 4398 8996 4388 9006
      4371 9031 4373 9031 4373 9040 4413 9156
      4425 9110 4440 9065 4432 9031 4425 9032
      4425 9000 4423 8991 4419 8993 4418 8990
TIME...MOT...LOC 2324Z 291DEG 48KT 4422 9045 4406 9071 4396 9092 

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

Lee

1 follow-up statement

107 
WWUS53 KARX 022351
SVSARX

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

WIC121-022359-
/O.CAN.KARX.SV.W.0015.000000T0000Z-200603T0015Z/
Trempealeau WI-
651 PM CDT Tue Jun 2 2020

...THE SEVERE THUNDERSTORM WARNING FOR SOUTHERN TREMPEALEAU COUNTY IS
CANCELLED...

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

A Severe Thunderstorm Watch remains in effect until midnight CDT for
central, southwestern and west central Wisconsin.

LAT...LON 4416 8993 4417 8997 4413 8998 4412 9001
      4409 9003 4401 9001 4398 8996 4388 9006
      4371 9031 4373 9031 4373 9040 4403 9124
      4425 9081 4437 9051 4432 9031 4425 9032
      4425 9000 4423 8991 4419 8993 4418 8990
TIME...MOT...LOC 2349Z 292DEG 45KT 4408 9006 4395 9039 4381 9062 

$$

WIC053-057-063-081-030015-
/O.CON.KARX.SV.W.0015.000000T0000Z-200603T0015Z/
La Crosse WI-Jackson WI-Juneau WI-Monroe WI-
651 PM CDT Tue Jun 2 2020

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR NORTHEASTERN LA CROSSE...SOUTHEASTERN JACKSON...JUNEAU AND MONROE
COUNTIES...

At 649 PM CDT, severe thunderstorms were located along a line
extending from near Necedah to 6 miles southeast of Tomah to 9 miles
northeast of Cashton, moving southeast 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.

These severe storms will be near...
  Necedah around 655 PM CDT.
  New Lisbon around 705 PM CDT.
  Elroy around 710 PM CDT.

Other locations impacted by these severe thunderstorms include New
Miner, Shamrock, Stevenstown, Potters Flowage, County Roads D E And
E, Johnson Hill and Glendale.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

LAT...LON 4416 8993 4417 8997 4413 8998 4412 9001
      4409 9003 4401 9001 4398 8996 4388 9006
      4371 9031 4373 9031 4373 9040 4403 9124
      4425 9081 4437 9051 4432 9031 4425 9032
      4425 9000 4423 8991 4419 8993 4418 8990
TIME...MOT...LOC 2349Z 292DEG 45KT 4408 9006 4395 9039 4381 9062 

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

Lee

What forecasters said that day

The local office's own words before this severe thunderstorm warning went out, as it sent them, from the Iowa Environmental Mesonet's archive of National Weather Service text.

NWS La Crosse, WI wrote its last area forecast discussion before this severe thunderstorm warning went out at Jun 2, 6:22 PM CDT, 3 minutes earlier.

Area forecast discussion, Jun 2, 6:22 PM CDT, 3 minutes before

Area Forecast Discussion
National Weather Service La Crosse WI
622 PM CDT Tue Jun 2 2020

.SHORT TERM...(This evening through Tonight)
Updated at 615 PM CDT Tue Jun 2 2020

Very steep mid level lapse rates (700-500 mb around 8 C/km) with
FAT CAPE profiles (SBCAPES in excess 3500 J/kg) is supporting
vigorous convection with large hail. With numerous outflow
boundaries and some drier air aloft, damaging wind gusts are also
likely. With wind shear not very impressive (deeper, stronger
removed to the north in the cooler air), tornado risk appears low
at this time. Storms should clear the area by midnight as the
surface front clears the area.

.LONG TERM...(Wednesday through Tuesday)
Issued at 239 PM CDT Tue Jun 2 2020

Surface ridge builds into the Upper Midwest Wednesday. Subsidence
underneath surface ridge will provide slightly cooler
temperatures and dry weather across the forecast area.

Next concern is Thursday afternoon into Friday morning...The  02.12z
are in decent agreement tracking a surface front across the forecast
area. The deterministic 02.12z models suggest enough 20 to 30 knots
of 0-3km shear...however the higher instability axis (2000-2500
j/kg) will be over the southern forecast area and lesser
instability (<500 j/kg) over the northern half where the
higher/deeper shear. Combined with the timing of the surface front
late Thursday evening/night...organized severe threat appears to
be low at this time. Diminishing chances of showers/storms are
expected Friday...as surface ridge builds north to south across
the region.

Main forecast concerns Friday night through Tuesday are on and off
small chances of showers/storms mainly Sunday into Tuesday. The
GFS/ECMWF/GEM 02.12z are in good agreement digging upper level
trough over the eastern Great Lakes Region and amplifying ridge
across the central United States through the period. As upper
level ridge builds east over the western Great Lakes
Region...southerly flow aloft advects warmer air and moisture into
the forecast area Sunday into Tuesday. Pieces of energy embedded
in the southwesterly flow aloft over the Rocky Mountains will
allow for on and off small chances of showers/storms Sunday into
Tuesday. High temperatures are expected to warm well into the 80s
by Monday and Tuesday...as both 02.12z GFS/ECMWF show 925mb
temperatures warming to plus 20 to plus 25 degrees celsius by 00z
Monday.

&&

.AVIATION...(For the 00Z TAFS through 00Z Wednesday evening)
Issued at 613 PM CDT Tue Jun 2 2020

Main aviation concern this evening is widespread, rapid, and
intense thunderstorm development. With abundant instability,
storms are producing large hail and strong surface winds. Periods
of storms will continue for the next several hours, and should
move out of the area by midnight.

&&

.ARX WATCHES/WARNINGS/ADVISORIES...
WI...None.
MN...None.
IA...None.
&&

SHORT TERM...DMD
LONG TERM...DTJ
AVIATION...DMD

Hazardous weather outlook, Jun 2, 12:58 PM CDT, 5 hours 27 minutes before

Hazardous Weather Outlook
National Weather Service La Crosse WI
1258 PM CDT Tue Jun 2 2020

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-
032>034-041>044-053>055-061-031000-
Mitchell-Howard-Winneshiek-Allamakee-Floyd-Chickasaw-Fayette-
Clayton-Wabasha-Dodge-Olmsted-Winona-Mower-Fillmore-Houston-
Taylor-Clark-Buffalo-Trempealeau-Jackson-La Crosse-Monroe-Juneau-
Adams-Vernon-Crawford-Richland-Grant-
1258 PM CDT Tue Jun 2 2020

This Hazardous Weather Outlook is for portions of southeast
Minnesota...northeast Iowa and southwest into central Wisconsin.

.DAY ONE...This Afternoon and Tonight

Storms will develop across southeast Minnesota early this
evening, quickly becoming severe. The storms will spread east and
south through the evening.

Very large hail and damaging winds are the main threats. Locally
heavy rain can also be expected and an isolated tornado cannot be
ruled out.

The severe risk will generally be confined between 7 pm and
midnight with the storms gradually weakening and exiting the area
by daybreak Wednesday.

In addition, near record or record high temperatures in the low
to mid 90s are expected this afternoon, resulting in maximum heat
indices of 95 to 100 degrees.

.DAYS TWO THROUGH SEVEN...Wednesday through Monday

Additional periodic chances for thunderstorms will occur Thursday
afternoon into early next week. Severe storms appear unlikely at
this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed this evening.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

Rieck

In the hours before

Local storm report, Jun 2, 5:55 PM CDT, 30 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
555 PM CDT TUE JUN 2 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0550 PM     HAIL             1 NW TREMPEALEAU        44.02N 91.45W
06/02/2020  M1.00 INCH       TREMPEALEAU        WI   LAW ENFORCEMENT

&&

Local storm report, Jun 2, 5:57 PM CDT, 28 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
557 PM CDT TUE JUN 2 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0550 PM     TSTM WND DMG     2 W WHITEHALL           44.37N 91.35W
06/02/2020                   TREMPEALEAU        WI   LAW ENFORCEMENT

            TREES DOWN.

&&

Local storm report, Jun 2, 5:59 PM CDT, 26 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
559 PM CDT TUE JUN 2 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0540 PM     HAIL             1 S WINONA              44.03N 91.66W
06/02/2020  E1.75 INCH       WINONA             MN   TRAINED SPOTTER

&&

Local storm report, Jun 2, 6:01 PM CDT, 24 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
601 PM CDT TUE JUN 2 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0550 PM     HAIL             TREMPEALEAU             44.01N 91.44W
06/02/2020  E1.00 INCH       TREMPEALEAU        WI   PUBLIC

            RELAYED VIA SOCIAL MEDIA PHOTO.

&&

Local storm report, Jun 2, 6:16 PM CDT, 9 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
616 PM CDT TUE JUN 2 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0606 PM     HAIL             3 S NEILLSVILLE         44.51N 90.60W
06/02/2020  E0.70 INCH       CLARK              WI   PUBLIC

            RELAYED VIA PHONE.

&&

Local storm report, Jun 2, 6:24 PM CDT, 1 minute before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
624 PM CDT TUE JUN 2 2020

..TIME...   ...EVENT...      ...CITY LOCATION...     ...LAT.LON...
..DATE...   ....MAG....      ..COUNTY LOCATION..ST.. ...SOURCE....
            ..REMARKS..

0615 PM     HAIL             HOLMEN                  43.96N 91.26W
06/02/2020  E1.25 INCH       LA CROSSE          WI   NWS EMPLOYEE

&&

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 2, 5:11 PM CDT	Special Weather Statement	ARX	Clark	49 min
Jun 2, 5:18 PM CDT	Severe Thunderstorm Warning	ARX	Buffalo, La Crosse, Trempealeau	42 min
Jun 2, 5:31 PM CDT	Severe Thunderstorm Warning	ARX	Jackson	44 min
Jun 2, 5:35 PM CDT	Severe Thunderstorm Warning	ARX	Clark, Jackson, Trempealeau	40 min
Jun 2, 5:52 PM CDT	Severe Thunderstorm Warning	ARX	Jackson, Trempealeau	38 min
Jun 2, 5:58 PM CDT	Severe Thunderstorm Warning	ARX	La Crosse, Trempealeau	47 min
Jun 2, 5:59 PM CDT	Severe Thunderstorm Warning	ARX	Jackson, Trempealeau	31 min
Jun 2, 6:07 PM CDT	Severe Thunderstorm Warning	ARX	Buffalo, Trempealeau	23 min
Jun 2, 6:09 PM CDT	Severe Thunderstorm Warning	ARX	Clark, Jackson	39 min
Jun 2, 6:32 PM CDT	Severe Thunderstorm Warning	ARX	La Crosse, Monroe, Trempealeau, Vernon	43 min
Jun 2, 6:44 PM CDT	Severe Thunderstorm Warning	ARX	Adams, Juneau	46 min
Jun 2, 6:59 PM CDT	Severe Thunderstorm Warning	ARX	Adams, Juneau, Richland, Vernon	61 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 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.