300
FXUS63 KIWX 301843
AFDIWX

Area Forecast Discussion
National Weather Service Northern Indiana
243 PM EDT Sat Aug 30 2025

.KEY MESSAGES...

- Chilly again tonight with lows near 48.

- Highs 75 to around 80 through Wednesday.

- Showers likely and possibly a thunderstorm Wednesday night.

&&

.DISCUSSION...
Issued at 226 PM EDT Sat Aug 30 2025

Chilly air for late August remained over the region. Early morning
lows fell to between 10 and 15 degrees below normal, well down into
the 40s last night from far southern Lower Michigan into adjacent
areas of northern Indiana and northwest Ohio. The CoCoRaHS
precipitation mapping system indicated widespread 0.10 to 0.40" rain
over the past 7 days over the forecast area. The dry ground
conditions accentuated these large diurnal swings. More chilly lows
are expected tonight, although with a slight recovery of the chilly
airmass, lows should be from about 47 to 50.

In the longer term, a large upstream anomalously strong upper level
ridge with heights over 300 meters above the climatological norms
will allow another round of chilly air to descent across the
upper Great Lakes region late this upcoming week. Ahead of the
arrival of the cold air, a cold front will bring a round of
showers and perhaps some isolated storms Wednesday into
Wednesday night. Severe weather is not expected but gusty winds
with the passage of the front are possible. Otherwise, mainly
dry weather and seasonably cool conditions are expected the rest
of the week with highs in the 60s to around 70-

&&

.AVIATION /18Z TAFS THROUGH 18Z SUNDAY/...
Issued at 140 PM EDT Sat Aug 30 2025

Northeasterly low level flow across the Great Lakes region will
result in a drier feed of low level air across northern Indiana
into Sunday. Earlier VFR low clouds across northwest Indiana
have rapidly eroded and little in the way of cloud cover is
expected through the remainder of the period. Weak gradient may
be supportive of a weak lake breeze at KSBN with a potential of
some sustained light northwest winds later this afternoon. VFR
conditions are expected to persist through the remainder of the
period, with fog not expected to be an issue at this time for
terminals due to low level dry air advection.

&&

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

&&

$$

DISCUSSION...Skipper
AVIATION...Marsili