695
FXUS63 KARX 171039
AFDARX

Area Forecast Discussion
National Weather Service La Crosse WI
440 AM CST Mon Nov 17 2025

.KEY MESSAGES...

- Measurable snow (potentially 1-3 inches) looking likely near
  Interstate 90 late tonight and on Tuesday morning.

- Rain later in the week (Thursday night and Friday) is looking
  far less likely, so transitioned the forecast drier.

&&

.DISCUSSION...
Issued at 234 AM CST Mon Nov 17 2025

This Afternoon through Tuesday

The 17.00z ensembles are general agreement that the surface low
will track southeast from eastern Nebraska through southwest
Iowa and then east across northern Missouri and central
Illinois. Soundings along Interstate 90 are slightly cold than
they were yesterday indicating more of a chance of snow after
midnight tonight and on Tuesday morning. Moderate to strong 800
to 600 mb frontogenesis continues to be shown south of
Interstate 94. In addition, the lift is being enhanced by upper
level divergence associated with the left exit region of the
upper jet. The 17.00z HREF shows a narrow (1 to 2 county wide)
2-4 inch snow band along Interstate 90. The probability of
matched mean indicate that there is a potential for localized
4-6 inch amounts. Hourly snow amounts will be likely up to a
half-inch. Lowered the hourly temperatures overnight by a degree
and the transition to all snow to 34 degrees. This resulted in
a band of 2-3 inches which seems rather realistic considering
the forcing and the DESI snow probabilities.

Thursday Night into Friday

Unlike yesterday, there has been significant shift southward
track in the low pressure system that was supposed to affect the
area during this time period. It is now forecast to move east
through the Mid-Mississippi River Valley east into the Mid-
Atlantic region. With this new track, the area is looking drier,
so trended the forecast that way.

&&

.AVIATION /12Z TAFS THROUGH 12Z TUESDAY/...
Issued at 440 AM CST Mon Nov 17 2025

CIGS: Mid level VFR cigs expected much of today, lowering into
MVFR/IFR as we move through tonight. Could drop into LIFR at KRST
toward 12z Tue - with short term guidance suggesting they would then
hold through Tue afternoon.

WX/vsby: rain spreads in from the south this evening, mixing with
and changing over to snow mostly after 06z. Vsby restrictions of 1-
2SM in the snow. Accumulations mostly on cold, grassy surfaces.
Accums from 1 to 2" currently expected. Snow, wintry mix looks to
exit east by Tue afternoon.

WINDS: easterly through the period, mostly around/below 10 kts.

&&

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

&&

$$

DISCUSSION...Boyne
AVIATION.....Rieck