Alert archive / Wisconsin / Special Weather Statements in 2017

Special Weather Statement, NWS La Crosse, WI

July 15, 2017Trempealeau County, Wisconsin

NWS La Crosse, WI issued this special weather statement at Jul 15, 2017, 6:25 PM CDT for Trempealeau County, Wisconsin. It was in force for 35 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
Jul 15, 2017, 6:25 PM CDT (23:25 UTC)
Expired
Jul 15, 2017, 7:00 PM CDT
In force
35 min
Issued by
NWS La Crosse, WI

County Trempealeau County, WI

The radar

The La Crosse radar (KARX), 73 km from the middle of the area, began a volume at 23:25 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 nearest sounding before it

Minneapolis, MN (KMPX), launched 12:00Z, 11.4 hours before the alert went out and 190 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-pSkew-T log-p diagram, Minneapolis, MN at 12:00Z on 2017-07-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 738 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 12:00Z on 2017-07-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 219 square meters per square second.19395878Sfc1 km3 km6 km9 kmRMLM
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
738 J/kg
Mixed-layer CIN
-358 J/kg
Mixed-layer LCL
958 m above ground
0-6 km bulk shear
23 kt
0-1 km storm-relative helicity
219 m²/s²
0-3 km storm-relative helicity
164 m²/s²
Significant tornado parameter
0.0
Supercell composite
0.3

Open this sounding in Storm Lab

The text

As transmitted.

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What forecasters said that day

The local office's own words before this special weather statement 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 special weather statement went out at Jul 15, 2:57 PM CDT, 3 hours 28 minutes earlier.

Area forecast discussion, Jul 15, 2:57 PM CDT, 3 hours 28 minutes before
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Hazardous weather outlook, Jul 15, 4:51 AM CDT, 13 hours 34 minutes before
Hazardous Weather Outlook
National Weather Service La Crosse WI
451 AM CDT Sat Jul 15 2017

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-
032>034-041>044-053>055-061-161100-
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-
451 AM CDT Sat Jul 15 2017

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

.DAY ONE...Today and Tonight

Scattered thunderstorms are possible, mainly between 4 and 10 PM.
A few storms may be severe, with large hail, damaging winds and
locally heavy rainfall the main threats.

.DAYS TWO THROUGH SEVEN...Sunday through Friday

Additional thunderstorms are possible at times from Tuesday
through Friday, but it is too early to discern any severe weather
threats during this time.

.SPOTTER INFORMATION STATEMENT...

Spotter activation may be requested late this afternoon and this
evening.

.EMERGENCY MANAGEMENT COORDINATION...

No webinar is scheduled.

In the hours before

Special weather statement, Jul 15, 5:35 PM CDT, 50 minutes before
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Special weather statement, Jul 15, 6:25 PM CDT, 0 minutes before
Special Weather Statement
National Weather Service La Crosse WI
625 PM CDT SAT JUL 15 2017

WIZ033-160000-
Trempealeau-
625 PM CDT SAT JUL 15 2017

...A STRONG THUNDERSTORM WILL AFFECT NORTHEASTERN TREMPEALEAU
COUNTY...

At 624 PM CDT, a strong thunderstorm was located 7 miles southeast of
Strum, or 8 miles north of Whitehall, moving southeast at 15 mph.

Winds in excess of 40 mph and half inch hail are possible with this
storm.

This storm will be near...
  Whitehall around 645 PM CDT.

Other locations impacted by this storm include Pigeon Falls and
Pleasantville.

This storm may intensify, so be certain to monitor local radio
stations and available television stations for additional information
and possible warnings from the National Weather Service.

LAT...LON 4455 9128 4447 9116 4438 9117 4434 9131
      4455 9137
TIME...MOT...LOC 2324Z 333DEG 14KT 4448 9128

Hollan

The office that day

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

IssuedProductOfficeCountiesLasted
Jul 15, 5:35 PM CDTSpecial Weather StatementARXTrempealeau40 min

Nearby

Special Weather Statements in Wisconsin, 2017Every special weather statement 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.