963
FXUS63 KIWX 091942
AFDIWX

Area Forecast Discussion
National Weather Service Northern Indiana
242 PM EST Tue Dec 9 2025

.KEY MESSAGES...

- Gusty southwest winds late this evening, becoming northwest behind
  a cold front on Wednesday (gusts 35-40+).

- Periods of rain and snow late this evening into Wednesday. Wet snow
  accumulations (near 1") possible tonight north of US 30. Snow
  accumulations near 1" near Lake MI Wednesday afternoon-
  evening. Minor travel impacts possible.

- The pattern remains active late this week into the upcoming
  weekend with cold temperatures and periodic snow chances.

&&

.DISCUSSION...
Issued at 242 PM EST Tue Dec 9 2025

A strong hybrid clipper system with a ~990 mb low pressure system
takes an east-southeast track through southern WI and southern lower
MI tonight into Wednesday morning bringing gusty winds and
precipitation. The initial precipitation develops on the leading
edge of a 50-60 kt LLJ later this evening into early Wednesday
morning, especially along and north of the US 30 corridor.
Model vertical thermal profiles suggest liquid/rain as the primary
ptype for most. The exception appears to be far northeast IN, south-
central MI and far northwest OH where a brief period of accumulating
wet snow appears likely sometime in the 04-08z timeframe, best
chances around Hillsdale/Angola/Coldwater where a sloppy inch or
two of snow cannot be ruled out. Lower probability and concern
for a brief period of freezing rain at onset elsewhere this
evening as ground temperatures likely warm just above freezing.
However, the recent cold stretch and snow cover could delay
expected warming just enough for a quick glaze of ice mid
evening into the early overnight (low confidence). Lastly, sfc
wind gusts within the ramping LLJ should generally be limited to
30-35 mph in this WAA regime.

Mid level dry slot briefly makes inroads later tonight through mid
morning Wednesday with a trend toward a more showery/drizzle
setup with temps in the mid-upper 30s. The system cold front and
wrap around moisture then races southeast through the local
area mid morning through mid afternoon on Wednesday. Gusty winds
and snow showers, potentially squally in nature, will accompany
this feature. There could be a 1-3 hour window where a few
gusts push near wind advisory criteria with the frontal passage.
A transition to lake effect snow showers/squalls in the CAA
regime likely does bring some light snow accumulations and
minor travel disruptions (vis restrictions) Wednesday afternoon-
evening with an inch or two possible in northwest IN and
southwest MI.

The parade of clipper systems in energetic northwest flow will
persist through the second half of the week into the upcoming
weekend with periodic snow chances. These appear to be your more
typical clipper systems that produce a rather narrow band of
accumulating snows along a tight baroclinic zone. The first of these
disturbances looks to zip through Thursday night into Friday
morning. Latest model guidance does continue to suggest mid-level
fgen snow clipping areas mainly southwest of US 30, though subtle
adjustments north or south remain possible. Another one then
follows in around Saturday-Saturday night per ensembles with
additional snow accums in or near our forecast area. Sub-zero
wind chills and LES the possible into Sunday behind this 2nd
wave. This pattern does finally look to break just beyond this
forecast period.

&&

.AVIATION /18Z TAFS THROUGH 18Z WEDNESDAY/...
Issued at 1242 PM EST Tue Dec 9 2025

The next weather system to impact the great lakes region will
drop southeast toward southern MI as an upper trof digs into the
region. A trailing cold front will traverse both terminal sites
Wednesday morning with winds turning northwest toward the end
of the fcst period.

Strong southwest llvl winds will cause the temperature profile
to warm enough to produce rain before eventually mixing and
changing to all snow by late morning on Wednesday. Wind shear
will be an issue for both sites with KFWA experiencing a longer
duration. MVFR cigs this aftn will lower to IFR overnight at
both sites, around 06Z at KSBN and not until mid morning at
KFWA.

&&

.IWX WATCHES/WARNINGS/ADVISORIES...
IN...None.
OH...None.
MI...None.
MARINE...Small Craft Advisory until 10 PM EST this evening for LMZ043-
     046.
     Gale Warning from 10 PM this evening to 7 PM EST Wednesday for
     LMZ043-046.

&&

$$

DISCUSSION...Steinwedel
AVIATION...Frazier