750
FXUS63 KIWX 242318
AFDIWX

Area Forecast Discussion
National Weather Service Northern Indiana
718 PM EDT Sat May 24 2025

.KEY MESSAGES...

- Pleasant weather through the Memorial Day weekend - Dry and
  cool with highs in the 60s.

- Seasonally cool with low chances for rain Tuesday and
  Wednesday with highs around 70.

&&

.DISCUSSION...
Issued at 200 PM EDT Sat May 24 2025

Chilly upper low over NB will rotate out off the NOAM coast
tomorrow aftn while a new upper low takes shape upstream across
the upper midwest through mid week before wrapping ewd and
combining in with another formidable/cold upper low dropping
south out of Hudson Bay toward next weekend. Thus while some
welcome temp moderation is on tap this week, temps will remain
well below seasonable norms.

Otherwise most of the period will be dry with the exception of late
Tue-Wed timeframe in association with progression/evolution of
generally moisture starved upper low through the lakes.

&&

.AVIATION /00Z TAFS THROUGH 00Z SUNDAY/...
Issued at 717 PM EDT Sat May 24 2025

VFR conditions are expected to hold through this forecast valid
period.

Diurnal cu enhanced by stronger flow off Lake Michigan will
continue to dissipate early this evening. Water vapor imagery
late this afternoon depicts pronounced upper level low across
northern WI/arrowhead of MN which will sag southeast and become
more sheared as it encounters blocking nature to mid/upper level
flow pattern. Downstream of this feature, guidance is fairly
consistent in some sharpening of a weak low level boundary with
some modest low level moisture pooling along it. This is
already manifesting itself in a pocket of 5-6k ft cigs across
eastern IA/northwest IL. As this wave sags southeast overnight,
expecting these VFR cigs to shift eastward into NW IN. Some
sprinkles/light rain showers are also possible with this low
level frontogenesis response, but for now will continue to hold
off on any mention with uncertainty as to where best fgen axis
sets up and due to expectation this would be a very light
rainfall amount scenario given moisture starved near sfc
levels. Reinforcing low level anticyclone builds across southern
Great Lakes early Sunday with light northeast winds backing
more northerly and increasing to around 10 knots during the day.

&&

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

&&

$$

DISCUSSION...T
AVIATION...Marsili