998
FXUS63 KIWX 012326
AFDIWX

Area Forecast Discussion
National Weather Service Northern Indiana
726 PM EDT Mon Sep 1 2025

.KEY MESSAGES...

- Large diurnal swings (daily temperature ranges) are expected
  through Wednesday with highs near 80 and lows well down into
  the 50s.

- A strong cold front will bring showers and isolated thunderstorms
  Wednesday afternoon through early Thursday,

- Highs only in the 60s Thursday and Friday with chilly lows well
  down into the 40s.

- There is a High Swim Risk for both La Porte County, IN and
  Berrien County, MI on Thursday.

&&

.DISCUSSION...
Issued at 229 PM EDT Mon Sep 1 2025

Cool and dry weather persisted over a large part of the region
associated with an expansive high pressure ridge from New England to
the High Plains. The airmass will attempt to modify ahead of a cold
front that is expected to arrive Thursday night. The latest model
runs support chances for showers and isolated thunderstorms in
about a 24 hour window from Wednesday 18Z (2pm EDT) to Thursday
18Z (2 pm EDT) with the passage of the front. Ahead of this front,
large diurnal temperature ranges will persist with highs around
80 and lows from 50 to 55.

Showers and isolated storms are expected with the passage of the
front late Wednesday and Wednesday night. Severe storms are not
forecast given very limited moisture and instability, and
overall relatively weak and limited dynamics. Mainly dry and
cool weather is ahead from late Thursday through the weekend
with highs in the upper 60s to lower 70s.

&&

.AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/...
Issued at 724 PM EDT Mon Sep 1 2025

Plenty of dry air with surface high pressure around and little,
if any, cloud cover should allow for good radiational cooling
tonight. However, it`s likely not enough for anymore than
agriculturally affected fog where sprinkling allows for
additional ground moisture that can be trapped under a
developing inversion. This stayed away from terminals this
morning, but cannot completely rule out patchy ground fog there
Tuesday morning. Still this fog isn`t enough to put into TAFs
in this issuance. A lake breeze developed late this afternoon
and it may be able to push far enough inland to swivel east
winds to start the day back to west-northwest tomorrow
afternoon. Winds still look to stay weaker than 10 kts through
the period.

&&

.IWX WATCHES/WARNINGS/ADVISORIES...
IN...None.
OH...None.
MI...None.
MARINE...None.

&&

$$

DISCUSSION...Skipper
AVIATION...Roller