Area Forecast Discussion
Issued by NWS La Crosse, WI

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FXUS63 KARX 080808

Area Forecast Discussion
National Weather Service La Crosse WI
208 AM CST Fri Dec 8 2017

.SHORT TERM...(Today and tonight)
Issued at 208 AM CST Fri Dec 8 2017

Main forecast concerns in the short term are on snow accumulations
late this afternoon through this evening.

Currently watching a weak band of flurries and at times very light
snow stretching from southeast Minnesota eastward through central
Wisconsin drifting south. The visibility has dropped into the 3
to 5 mile range as the light snow moves through at a couple of
sites over central Wisconsin. Thinking there may be a dusting to
perhaps a hundredth of an inch of snow accumulation with this
band. The band will continue to drift south across the area
through around mid morning before weakening. Occasional flurries
are then possible today as stratus overspreads the region. A fast
moving shortwave trough pushes through the region late this
afternoon into this evening bringing a quick shot of light snow to
the area. Most the accumulations will be along and east of the
Mississippi River where 1 to 2 inches of snow is possible. There
is the possibility for 2.5 to perhaps 3 inches over portions of
central Wisconsin. Overall forecast models have trended a little
less with snow accumulation with the 00Z model runs. Areas north
of interstate 94 could see the accumulating snow start during the
evening commute. Further to the west, expect to see a few
hundredths to perhaps an inch of snow over portions of northeast
Iowa and southeast Minnesota.

.LONG TERM...(Saturday through Thursday)
Issued at 208 AM CST Fri Dec 8 2017

Main forecast concerns in the long term are on snow chances
Sunday night into Monday and the potential for strong northwest
winds during the day on Monday.

A colder airmass settles over the region on Saturday with highs
struggling to make it out of the 20s. Persistent northerly winds
will drive wind chill values into the single digits for most of the
day. Temperatures then warm a bit for Sunday into Monday as low
pressure tracks from southern Manitoba into the Upper Mississippi
River Valley. There is the potential for measurable snowfall with
this system Sunday night into Monday morning but confidence is
low on the placement of the snow. A model consensus places
accumulating snow mainly over northern Wisconsin, but will have
to keep a close eye on this. A rather chilly airmass moves in for
Monday night into Tuesday in the wake of the low. Lows Monday
night will fall into the single digits to teens with wind chill
values in the single digits below zero. The cool northwest flow
will continue across the region right on through the end of next
week. There will be more opportunities for light snow mainly
Wednesday into Thursday night. No stronger systems are on the
horizon at this time.


.AVIATION...(For the 06Z TAFS through 06Z Friday night)
Issued at 1149 PM CST Thu Dec 7 2017

Ceilings will lower to MVFR by 15Z today as a shortwave trough
and cold front edge south toward the region. Flurries are also
possible through much of the day. The main system will move in
this evening with IFR conditions overspreading KLSE in snow.
Accumulations of around 1 inch are expected at KLSE. MVFR to IFR
conditions are possible in stratus at KRST with flurries or light
snow also possible at times this evening. Look for northwest
winds to increase tonight into the 14 to 17 kt range with gusts of
20 to 27 kts at times.




SHORT TERM...Wetenkamp
LONG TERM...Wetenkamp
AVIATION...Wetenkamp is the U.S. government's official web portal to all federal, state and local government web resources and services.