Special Weather Statement, NWS La Crosse, WI

Area Forecast Discussion
National Weather Service La Crosse WI
241 AM CDT SUN JUN 12 2016

.SHORT TERM...(Today and tonight)
Issued at 241 AM CDT Sun Jun 12 2016

Main forecast concerns for the short term are on shower and
thunderstorms this morning and chances for showers and storms
tonight.

Thunderstorms will be ongoing this morning, especially along and
west of the Mississippi River with the potential for heavy
rainfall and small hail. Plenty of elevated CAPE to to work with
when lifting from around 850 MB. The RAP is indicating around 1600
J/KG CAPE at KRST. Precipitable water values are also high at 1.91
inches with deep warm cloud depths of 11,320 ft. So, bottom line
is that these storms will be efficient rain producers. Look for
the thunderstorms to taper off by late morning as CAPE gets pushed
west and high pressure builds in from the northeast. Cooler
temperatures expected across the area today as a cold front moved
in from the northeast overnight. Plan on highs today ranging from
the lower 70s across northcentral Wisconsin to around 80 over
northeast Iowa. A cold front then pushes into the forecast area
from the northwest late tonight into Monday and the warmer
unstable airmass pushes back into the area ahead of the front.
Scattered shower and storms are possible along the front, but it
appears this activity will be on a weakening trend as it
encounters drier air tonight with redevelopment expected along the
front during the day on Monday.

.LONG TERM...(Monday through Saturday)
Issued at 241 AM CDT Sun Jun 12 2016

A cold front will meander south across the area on Monday. A
shortwave pushes through the region and interacts with the front,
sparking showers and thunderstorms, especially along and south of
the interstate 90 corridor. Shear is rather weak so not expecting
any severe storms at this time. The front then stalls out across
Iowa and northern Illinois Monday night and lifts back to the
north as a warm front as a trough pushes northeast out of the
Plains. This system will likely bring showers and thunderstorms to
the area and if we can clear out and build cape into the area, we
may see some strong to severe storms. Showers and storms could be
ongoing along the warm from Tuesday morning then stronger forcing
moves in with the shortwave Tuesday afternoon into Tuesday
evening. We look to build around 2000 J/KG cape with 0-3 KM bulk
shear increasing to around 30 kts. Details to be worked out, but
will have to continue to watch this timeframe closely. Showers and
storms then look to be ongoing Wednesday then will exit by late
afternoon into the early evening as the upper low works east. We
will be caught in some cyclonic flow through Thursday morning so
we could see linger showers across portions of Wisconsin. High
pressure then builds in for Thursday and looks to remain in
control the rest of the work week and possibly into the start of
the weekend. Temperatures and humidity levels look to be
comfortable. Highs are expected to be in the 70s on Thursday then
warming into the lower 80s into the weekend.

&&

.AVIATION...(For the 06Z TAFS through 06Z Sunday night)
Issued at 1145 PM CDT Sat Jun 11 2016

The cold front has become more northwest to southeast oriented
this evening as expected and extends from northeast South Dakota
into northwest Illinois. The hi-res models this evening have
continued to trend toward showers and storms developing along this
boundary late tonight. The 12.00Z NAM continues to show a band of
strong frontogenesis in the 900-800 mb layer along the front with
3 to 6 ubar/s of up glide on the 305K isentropic surface. The
moisture transport into the front is still forecast to be on the
weak side, but with the hi-res models all now depicting some
activity along the front, will go ahead and put in a VFR ceiling
along with a VCTS for late tonight into Sunday morning. This
activity should move past the airports by the mid to late Sunday
morning with VFR conditions then expected for the rest of the
period.

&&

.ARX Watches/Warnings/Advisories...
WI...None.
MN...None.
IA...None.
&&

SHORT TERM...WETENKAMP
LONG TERM...WETENKAMP
AVIATION...04

HAZARDOUS WEATHER OUTLOOK
NATIONAL WEATHER SERVICE LA CROSSE WI
403 AM CDT SUN JUN 12 2016

IAZ008>011-018-019-029-030-MNZ079-086>088-094>096-WIZ017-029-
032>034-041>044-053>055-061-131100-
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-
403 AM CDT SUN JUN 12 2016

THIS HAZARDOUS WEATHER OUTLOOK IS FOR PORTIONS OF NORTHEAST
IOWA...SOUTHEAST MINNESOTA...AND SOUTHWEST INTO CENTRAL WISCONSIN.

.DAY ONE...TODAY AND TONIGHT

SCATTERED THUNDERSTORMS ARE EXPECTED THIS MORNING MAINLY ALONG AND
WEST OF THE MISSISSIPPI RIVER. THE STRONGER STORMS MAY PRODUCE
BRIEF HEAVY RAINFALL AND SMALL HAIL.

THERE IS A CHANCE FOR THUNDERSTORMS TONIGHT MAINLY NORTH OF
INTERSTATE 90. SEVERE WEATHER IS NOT EXPECTED.

.DAYS TWO THROUGH SEVEN...MONDAY THROUGH SATURDAY

THUNDERSTORM CHANCES WILL CONTINUE MONDAY THROUGH THURSDAY.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL NOT BE NEEDED.

.EMERGENCY MANAGEMENT COORDINATION...

NO WEBINAR IS SCHEDULED.

WETENKAMP

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