Alert archive / Wisconsin / Severe Thunderstorm Warnings in 2017

Severe Thunderstorm Warning 143, NWS La Crosse, WI

June 28, 2017Buffalo County, Trempealeau County, Wisconsin

NWS La Crosse, WI issued this severe thunderstorm warning at Jun 28, 2017, 5:57 PM CDT for Buffalo County, Trempealeau County, Wisconsin. It was in force for 78 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: Jun 28, 2017, 5:57 PM CDT (22:57 UTC)
Expired: Jun 28, 2017, 7:15 PM CDT
In force: 78 min
Issued by: NWS La Crosse, WI
Area: Storm-based polygon
Tornado: Possible
Hail: 0.88 in
Wind: 60.0 mph

Counties Buffalo County, WI, Trempealeau County, WI

The radar

The La Crosse radar (KARX), 78 km from the middle of the area, began a volume at 22:58 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.

Did it verify

Not verified. The Iowa Environmental Mesonet's Cow found no qualifying storm report inside this severe thunderstorm warning while it was in force. That is not proof nothing happened: reports are thin where few people live.

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 28, 4:09 PM CDT	Tornado Watch	SPC	6 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.0 hours before the alert went out and 162 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: 6 J/kg
Mixed-layer CIN: -111 J/kg
Mixed-layer LCL: 537 m above ground
0-6 km bulk shear: 38 kt
0-1 km storm-relative helicity: 511 m²/s²
0-3 km storm-relative helicity: 568 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.1

Open this sounding in Storm Lab

The text

As transmitted.

382 
WUUS53 KARX 282257
SVRARX
WIC011-121-290015-
/O.NEW.KARX.SV.W.0143.170628T2257Z-170629T0015Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service La Crosse WI
557 PM CDT WED JUN 28 2017

The National Weather Service in La Crosse has issued a

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

* Until 715 PM CDT

* At 556 PM CDT, a severe thunderstorm was located near Mondovi, 
  moving southeast at 25 mph. This warning extends the previous 
  warning for the area.

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

  SOURCE...Radar indicated. 

  IMPACT...Expect damage to roofs, siding, and trees. 

* This severe thunderstorm will be near...
  Strum around 620 PM CDT. 
  Independence around 635 PM CDT. 
  Arcadia around 640 PM CDT. 
  Whitehall around 645 PM CDT. 
  Blair around 700 PM CDT. 

Other locations impacted by this severe thunderstorm include Eleva,
Ettrick, Gilmanton, Pigeon Falls and Montana.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of 
a building. This storm could produce a brief tornado so move indoors 
if storms are nearby.

&&

A tornado watch remains in effect until 1000 PM CDT for west central
Wisconsin.

LAT...LON 4452 9202 4460 9170 4460 9152 4449 9116
      4409 9115 4435 9182
TIME...MOT...LOC 2256Z 301DEG 24KT 4451 9170 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$

Shea

4 follow-up statements

366 
WWUS53 KARX 282314
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
614 PM CDT WED JUN 28 2017

WIC011-121-290015-
/O.CON.KARX.SV.W.0143.000000T0000Z-170629T0015Z/
Buffalo WI-Trempealeau WI-
614 PM CDT WED JUN 28 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR NORTHERN BUFFALO AND TREMPEALEAU COUNTIES...

At 612 PM CDT, a severe thunderstorm was located 8 miles northwest of
Independence, or 10 miles southeast of Mondovi, moving east at 30 
mph. Another strong storm was about 5 miles southwest of Mondovi, 
also moving southeast.

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

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

This severe storm will be near...
  Strum around 620 PM CDT. 
  Independence around 625 PM CDT. 
  Whitehall around 635 PM CDT. 
  Blair around 650 PM CDT. 

Other locations impacted by this severe thunderstorm include Eleva,
Ettrick, Gilmanton, Pigeon Falls and Montana.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of 
a building. These storms could produce a brief tornado so stay 
indoors at the very least.

&&

A tornado watch remains in effect until 1000 PM CDT for west central
Wisconsin.

LAT...LON 4452 9202 4460 9170 4460 9152 4449 9116
      4409 9115 4435 9182
TIME...MOT...LOC 2312Z 289DEG 27KT 4446 9153 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$

Shea

931 
WWUS53 KARX 282337
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
637 PM CDT WED JUN 28 2017

WIC011-121-290015-
/O.CON.KARX.SV.W.0143.000000T0000Z-170629T0015Z/
Buffalo WI-Trempealeau WI-
637 PM CDT WED JUN 28 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR NORTHERN BUFFALO AND CENTRAL TREMPEALEAU COUNTIES...

At 636 PM CDT, a cluster of severe thunderstorms extended from south 
of Durand to near Whitehall Wisconsin, moving southeast at 30 mph.

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

SOURCE...Radar indicated. 

IMPACT...Expect damage to roofs, siding, and trees. 

This severe storm will be near...
  Blair around 655 PM CDT. 

Other locations impacted by this severe thunderstorm include Ettrick,
Gilmanton, Pigeon Falls, Montana and Chimney Rock.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 1000 PM CDT for west central
Wisconsin.

LAT...LON 4452 9202 4457 9171 4456 9152 4447 9116
      4409 9115 4435 9182
TIME...MOT...LOC 2336Z 301DEG 24KT 4438 9134 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$

Shea

682 
WWUS53 KARX 290003
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
703 PM CDT WED JUN 28 2017

WIC011-121-290015-
/O.CON.KARX.SV.W.0143.000000T0000Z-170629T0015Z/
Buffalo WI-Trempealeau WI-
703 PM CDT WED JUN 28 2017

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 715 PM CDT
FOR NORTHEASTERN BUFFALO AND CENTRAL TREMPEALEAU COUNTIES...

At 702 PM CDT, a severe thunderstorm was located over Whitehall, 
moving east at 35 mph. Another strong storm was between Alma and 
Mondovi Wisconsin.

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

SOURCE...Radar indicated. 

IMPACT...Possible damage to roofs, siding, and trees. 

This severe storm will be near...
  Blair around 710 PM CDT. 

Other locations impacted by this severe thunderstorm include Ettrick,
Gilmanton, Pigeon Falls, Montana and Chimney Rock.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

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

&&

A tornado watch remains in effect until 1000 PM CDT for west central
Wisconsin.

LAT...LON 4446 9181 4452 9163 4456 9152 4447 9116
      4409 9115 4434 9179
TIME...MOT...LOC 0002Z 287DEG 30KT 4435 9130 

TORNADO...POSSIBLE
HAIL...0.88IN
WIND...60MPH
 
$$

Shea

247 
WWUS53 KARX 290015
SVSARX

Severe Weather Statement
National Weather Service La Crosse WI
715 PM CDT WED JUN 28 2017

WIC011-121-290024-
/O.EXP.KARX.SV.W.0143.000000T0000Z-170629T0015Z/
Buffalo WI-Trempealeau WI-
715 PM CDT WED JUN 28 2017

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN BUFFALO AND
CENTRAL TREMPEALEAU COUNTIES WILL EXPIRE AT 715 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 heavy rain are still possible with this thunderstorm.

LAT...LON 4446 9181 4452 9163 4456 9152 4447 9116
      4409 9115 4434 9179
TIME...MOT...LOC 0014Z 301DEG 24KT 4431 9121 

$$

Shea

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 28, 2:30 PM CDT, 3 hours 27 minutes earlier.

Area forecast discussion, Jun 28, 2:30 PM CDT, 3 hours 27 minutes before

Area Forecast Discussion
National Weather Service La Crosse WI
230 PM CDT Wed Jun 28 2017

.SHORT TERM...Tonight through Thursday
Issued at 230 PM CDT Wed Jun 28 2017

Obvious concern in short term is how storm threat this evening plays
out. Lots of questions to answer with only a few hours potentially
to decipher outcome.

Quasi-zonal flow across northern tier of U.S. with several short
waves moving with moderate mid-level flow. Short wave in question
for tonight is slowly working across Minnesota. As of 19Z abundant
convection still exists in area, lingering from early morning
system. This continues to complicate outcome.

Higher mixed layer CAPE pool of 1500-2500 J/Kg resides mainly west
of the area while gradient region in our forecast area. Meanwhile,
best shear, which is highest in 0-3km layer, has been advecting east
today, and is strongest over Wisconsin areas. Low level shear /0-
1km/ is respectable as well, but again, is highest in Wisconsin.

Mesoscale models continue to blossom convection from central/eastern
Iowa into southern Wisconsin this afternoon where psuedo warm front
exists along with slightly better moisture advection. These storms
have more potential for large hail and/or damaging wind, along with
more heavy rain. We've already seen fairly decent rainfall
efficiencies with storms. Would expect watch to be issued south
first.

Further north, less cape to work with, but closer to short wave may
produce slightly higher localized low-level shear. Latest update to
Day 1 SPC outlook brought tornado risk northward which seems
reasonable, albeit still conditional. While storms may not be as
strong in western and north central Wisconsin as cold front
approaches, there is a potential for brief tornado development.
Confidence is low with any of these scenarios but there is potential
there. Again - bears watching and be alert for.

As wave progresses, storm activity should push east and south by
late evening leading to quiet overnight and quiet spell for most of
Thursday. Boundary with higher precipitable water levels will be
shunted just to the south of the area, close enough though to be a
player for late week.

.LONG TERM...Thursday Night through Wednesday
Issued at 230 PM CDT Wed Jun 28 2017

Weather will remain active at times in outer forecast periods,
although sensible storm threat shouldn't be too strong or severe.

Next upstream short wave in flow will begin to affect weather
potentially already Thursday night with some return flow. Given
proximity of boundary just south of the area, could see convection
break out and spread back north into the area going into Friday
morning as wave moves through. Higher severe weather risk should
remain south and east of the area though where better thermodynamics
will exist.

Meanwhile medium range guidance suggests yet another short wave
trough will drop into Great Lakes region as northwest flow becomes a
bit more established. This could keep us unsettled for parts of the
area this weekend with mainly diurnal showers and storms.

More disagreement in models as you get into Sunday and Monday time
frame. While upper ridge starts to form, some guidance drops a short
wave through corn belt bringing an enhanced storm threat, but
otherwise warming trend on tap.

It's early yet, but outlook for Fourth of July holiday could be
quiet with short range upper ridge and boundary south of the area.
Lowered some guidance rain chances here based on trends.

&&

.AVIATION...(For the 18Z TAFS through 18Z Thursday afternoon)
Issued at 1235 PM CDT Wed Jun 28 2017

Scattered showers and storms expected to continue moving through
the area this afternoon and evening, with ongoing storms in north-
central Iowa possibly impacting KLSE. These storms look to
generally stay south of KRST, but a few light showers may make
their way into the area. An additional line of storms is expected
to develop from southeast Minnesota into northwest Wisconsin by
late afternoon and move southeast through the evening. KRST looks
to be on the southern end of this line, so not enough confidence
to include more than VCTS, but hi-res models have consistently
shown line moving through KLSE, so have included TS in a TEMPO
group from 00Z to 02Z. Lower ceilings and visibilities are
possible with any thunderstorm that directly impacts a TAF site.
Otherwise, ceilings will increase to VFR levels early this
afternoon, with gusty winds around 25 kts expected through early
this evening. All storms will be southeast of both TAF sites by
03Z.

&&

.HYDROLOGY...Through This Evening
Issued at 230 PM CDT Wed Jun 28 2017

Rainfall overnight was in 1-2" range in parts of the area,
especially northeast Iowa. Rivers doing pretty good though.

Storms should be fairly progressive tonight but will have to watch
for repeat areas that could produce some localized issues.  Once
storms exit area later this evening, heavy rainfall threat much
lower.

&&

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

SHORT TERM...Shea
LONG TERM...Shea
AVIATION...CA
HYDROLOGY...Shea

Hazardous weather outlook, Jun 28, 3:02 PM CDT, 2 hours 55 minutes before

Hazardous Weather Outlook
National Weather Service La Crosse WI
302 PM CDT Wed Jun 28 2017

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-
032>034-041>044-053>055-061-291100-
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-
302 PM CDT Wed Jun 28 2017

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

.DAY ONE...This Afternoon and Tonight

Additional scattered thunderstorms are expected through mid evening.

Across northeast Iowa into southwest Wisconsin storms may be severe
at times with large hail, damaging wind, heavy rain, and the
potential for isolated tornadoes.

From southeast Minnesota into western and north central Wisconsin,
storms are expected to expand across the area with the potential for
hail and isolated tornadoes.

All this storm activity is expected to be south and east of the area
by 10 pm.

.DAYS TWO THROUGH SEVEN...Thursday through Independence Day

There will be periodic storm chances from Thursday night through
Monday. It is too early to discern if there would be a severe
threat.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be needed at times this afternoon and evening.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

Aegerter/Shea

In the hours before

Local storm report, Jun 28, 5:10 PM CDT, 47 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
510 PM CDT WED JUN 28 2017

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

0505 PM     TSTM WND GST     1 E FARMERSBURG         42.96N 91.35W
06/28/2017  M60 MPH          CLAYTON            IA   EMERGENCY MNGR

            PEA SIZE HAIL ALSO.

&&

TMS

Local storm report, Jun 28, 5:12 PM CDT, 45 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
512 PM CDT WED JUN 28 2017

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

0453 PM     TSTM WND DMG     2 NNW FARMERSBURG       42.98N 91.39W
06/28/2017                   CLAYTON            IA   EMERGENCY MNGR

            NUMEROUS TREES DOWN AT INTERSECTION OF 165TH
            STREET AND FALCON AVE. TIME ESTIMATED FROM
            RADAR.

&&

CJA

Local storm report, Jun 28, 5:24 PM CDT, 33 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
524 PM CDT WED JUN 28 2017

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

0403 PM     TSTM WND DMG     CALMAR                  43.18N 91.86W
06/28/2017                   WINNESHIEK         IA   PUBLIC

            TREE SNAPPED. RELAYED VIA BROADCAST MEDIA.
            TIME ESTIMATED FROM RADAR.

&&

CJA

Local storm report, Jun 28, 5:39 PM CDT, 18 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
539 PM CDT WED JUN 28 2017

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

0537 PM     TSTM WND GST     CASSVILLE               42.72N 90.99W
06/28/2017  E60 MPH          GRANT              WI   FIRE DEPT/RESCUE

            REPORT RELAYED BY THE EMERGENCY MANAGER.

&&

Local storm report, Jun 28, 5:41 PM CDT, 16 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
541 PM CDT WED JUN 28 2017

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

0523 PM     TSTM WND DMG     4 SSE GIARD             42.96N 91.25W
06/28/2017                   CLAYTON            IA   EMERGENCY MNGR

            POWER LINES DOWN. 20-24 INCH TREE DOWN.

&&

TMS

Local storm report, Jun 28, 5:57 PM CDT, 0 minutes before

PRELIMINARY LOCAL STORM REPORT
NATIONAL WEATHER SERVICE LA CROSSE WI
557 PM CDT WED JUN 28 2017

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

0554 PM     TSTM WND GST     3 NE LANCASTER          42.88N 90.67W
06/28/2017  M63 MPH          GRANT              WI   TRAINED SPOTTER

            ON COUNTY RD A.

&&

TMS

The office that day

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

Issued	Product	Office	Counties	Lasted
Jun 28, 4:34 PM CDT	Special Weather Statement	ARX	Crawford, Grant	56 min
Jun 28, 4:44 PM CDT	Special Weather Statement	ARX	Buffalo, Clark, Jackson, Taylor, Trempealeau	61 min
Jun 28, 5:09 PM CDT	Severe Thunderstorm Warning	ARX	Buffalo	51 min
Jun 28, 5:11 PM CDT	Severe Thunderstorm Warning	ARX	Crawford, Grant	64 min
Jun 28, 5:36 PM CDT	Severe Thunderstorm Warning	ARX	Grant	54 min
Jun 28, 5:40 PM CDT	Tornado Warning	ARX	Grant	35 min
Jun 28, 6:28 PM CDT	Special Weather Statement	ARX	Grant	62 min
Jun 28, 6:31 PM CDT	Special Weather Statement	ARX	Grant	59 min

Nearby

Severe Thunderstorm Warnings in Wisconsin, 2017 Every severe thunderstorm warning in 2017

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.