Area Forecast Discussion
Issued by NWS La Crosse, WI

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FXUS63 KARX 082341

Area Forecast Discussion
National Weather Service La Crosse WI
541 PM CST Fri Dec 8 2017

.SHORT TERM...(Tonight through Saturday Night)
Issued at 152 PM CST Fri Dec 8 2017

Mixed bag of clouds this afternoon with skies partly/mostly cloudy
north of I-94 and mostly sunny south. Meanwhile, GOES East water
vapor/ir imagery showing a fairly vigorous mid-level trough dropping
south through western Ontario. Light snow from this feature was
reaching across portions of far northern MN as of 1 pm. Temperature-
wise, readings pretty close to seasonal norms in the 20s to the
middle 30s.

Will be watching that mid-level trough drop quickly southward across
the area tonight with bulk of snowfall for our area falling in the 6
pm to midnight time frame. Still thinking 1-2 inches of accumulation
generally northeast of I-94, tapering off to the southwest. This mod-
level trough/pv-advection will be spinning up a fairly deep surface
low overnight into saturday morning which will increase pressure
gradient/ northwest winds across our area. This will likely cause
some localized blowing around of the freshly fallen light snow. Not
anticipating any whiteout conditions but probably some reduced
visibilities at times.

Conditions improve through the day Saturday as high pressure builds
in. Plan on clouds to scatter out by late morning, but pretty chilly
with highs only in the teens to middle 20s.

Another very weak mid-level trough/secondary cold front drops
southeast across the area Saturday night. This looks to come through
dry with just some increase cloud cover. Otherwise, look for
overnight lows in the teens.

.LONG TERM...(Sunday through Friday)
Issued at 152 PM CST Fri Dec 8 2017

Northwest flow regime continues through next week. Will be watching
a wave of low pressure dropping southeast into region Sunday night
into Monday for the likelihood of some light snow, especially for
areas along/northeast of I-94. Will also have to watch for some
freezing drizzle with potential loss of cloud ice.

Tuesday looks dry but very chilly with expected highs only in the
teens/lower 20s and lows Tuesday night in the single digits/lower
teens above zero.

Perturbed northwest flow Wednesday through Friday will produce
intermittent light snow chances. Otherwise, plan on near normal
temperatures with highs in the 20/30s and lows in the teens/lower


.AVIATION...(For the 00Z TAFS through 00Z Saturday evening)
Issued at 541 PM CST Fri Dec 8 2017

A 1-2 hour period of IFR to MVFR conditions is expected tonight
in light snow. Look for the snow to move into KLSE around 03Z
with the visibility dropping to around 2 SM and ceilings lowing to
1kft or possibly lower. The snow will exit KLSE by 05Z. At KRST,
light snow is expected too but the snow will be on the lighter
side with mainly MVFR conditions expected. Flurries and weak snow
showers will linger into the overnight but look for winds to
increase to 13 to 17 kts after 03Z with gusts to around 25 kts
possible. Conditions will improve to VFR Saturday morning as high
pressure builds in form the northwest. Winds will also diminish
by Saturday afternoon as the high edges in. Snow accumulations of
around 1 inch are expected at KLSE with around 1/2 inch possible
at KRST. The light snow may blow around or drift a little as the
stronger northwest winds kick in late this evening.




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