Area Forecast Discussion
Issued by NWS La Crosse, WI

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FXUS63 KARX 072334
AFDARX

Area Forecast Discussion
National Weather Service La Crosse WI
534 PM CST Thu Dec 7 2017

...00Z Aviation Update...

.SHORT TERM...(Tonight through Friday Night)
Issued at 213 PM CST Thu Dec 7 2017

Area remains under a deep/cold mid-level trough extending from
Hudson Bay Canada through WI into the central/southern Plains.
Pretty quiet/mostly sunny this afternoon with temperatures in the
teens/lower 20s.

Another weak embedded shortwave trough will drop into the area
tonight for an increase in clouds and a few flurries after midnight.
Look for the clouds and flurries to continue through Friday with
highs in the 20s/lower 30s.

Attention then turns to some minor snow accumulations for Friday
night as a more vigorous shortwave trough drops southeast across
the area. Looks like generally 1-2 inches along and east of the
Mississippi River with lesser amounts expected west. Most of this
snowfall is expected to be before midnight...tapering off quickly
after midnight. Winds are expected to pick up by late in the
evening/overnight as pressure gradient increases. This may lead to
some blowing around of the freshly fallen snow.

.LONG TERM...(Saturday through Thursday)
Issued at 213 PM CST Thu Dec 7 2017

Saturday looks quiet as high pressure builds into the region.
Otherwise, chilly with highs only in the teens to middle 20s.

Warm air advection overspreads the region Sunday ahead of a cold
front dropping south out of Canada. Not expecting any precipitation
as of now but will have to keep an eye on this as some sounding data
shows saturation through the column. Otherwise, mostly cloudy skies
will prevail with highs in the upper 20s to the upper 30s.

A chance of snow moves into the area Sunday night into Monday as
that aforementioned cold front sinks into the area with an upstream
mid-level shortwave trough interacting on the frontal gradient.
Potential exists for some minor snow accumulations with this
feature.

Intermittent light snow chances linger Tuesday through Thursday as
we remain locked in perturbed northwest flow aloft.

&&

.AVIATION...(For the 00Z TAFS through 00Z Friday evening)
Issued at 534 PM CST Thu Dec 7 2017

Main aviation concerns are on an MVFR stratus deck expected to
move into the TAF sites from the north after 12Z. Otherwise, plan
on increasing mid level clouds prior to 11-12Z. Ceilings are then
expected to lower to around 2500 ft at KLSE and to around 2000 ft
at KRST. Flurries are possible at times through the day on Friday.
Light snow is then expected to move into the TAF sites after 00Z
Saturday with IFR conditions likely in the snow, especially at
KLSE. Northwest wind will also be on the increase Friday evening
with sustained speeds of 14 to 18 kts possible with gusts to
around 32 kts possible.

&&

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

$$

SHORT TERM...DAS
LONG TERM...DAS
AVIATION...Wetenkamp



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