335
FXUS63 KIWX 072327
AFDIWX

Area Forecast Discussion
National Weather Service Northern Indiana
627 PM EST Sun Dec 7 2025

.KEY MESSAGES...

- Cold wind chills tonight and Monday night, -10F to +5F.

- Warmer temperatures with periods of snow and a rain mix
  Tuesday and Wednesday.

- Turning very cold again late this week with highs in the
  teens.

&&

.DISCUSSION...
Issued at 228 PM EST Sun Dec 7 2025

In the wake of the clipper type system that had brought the
burst of snowfall earlier today and continues to move
eastward another shot of arctic air will spill southward into
the area tonight. Some light flurries/snow showers may accompany
initially the cold airmass as it pushes southward across the CWA.
Low temperatures tonight will drop down into the single digits
and wind chill readings will drop below zero ranging from about
-5 to -10 degrees. As we have said in previous discussions one
 should dress properly for the cold as exposed skin could become
 frost bitten in a very short time. Also, don`t forget the pets
 or livestock and protect them.

This cold air remains through Monday with highs only in the
lower to mid 20s and overnight into Tuesday morning lows will be
slightly warmer than Monday morning with lows right around 10
degrees with wind chills near zero. However, warm air advection
ahead of another shortwave moving southeastward in the
northwesterly flow aloft will help to moderate temperatures
fairly quickly on Tuesday with highs getting into the mid to
upper 30s. Will have to see if temperatures may be a bit dulled
by the snowy ground cover. Also will be keeping an eye to see
if we get a bit of advection fog especially during the overnight
periods Tuesday through Wednesday. This disturbance will also
bring periods of increased chances of rain/snow mix. There will
be periods where it could switch over to mainly rain showers.
The other potential here would be some freezing rain due to the
very cold surfaces from the recent deep freeze.

Thursday a deeper trough pushes south out of Canada and we will
see yet another punch of arctic air into the weekend. Thursday
highs will drop back into the mid 20s and low temperatures by
Friday morning back into the low teens across the area. Friday`s highs
slightly colder with values only getting into the lower 20s.
But becoming even colder by the weekend with single digit lows
for both Saturday and Sunday morning. Highs on Saturday and
Sunday will only reach the mid teens.

&&

.AVIATION /00Z TAFS THROUGH 00Z TUESDAY/...
Issued at 622 PM EST Sun Dec 7 2025

Clearing line working south out of MI and likely to arrive at
both sites over the next couple of hours. Opted to have
predominate VFR conditions and a tempo for a few hours to handle
this. Once the clearing arrives, no major flight conditions
anticipated through the remainder of the period.

&&

.IWX WATCHES/WARNINGS/ADVISORIES...
IN...None.
OH...None.
MI...None.
MARINE...Small Craft Advisory until 4 AM EST Monday for LMZ043-046.

&&

$$

DISCUSSION...Andersen
AVIATION...Fisher