788
FXUS63 KLOT 020714
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
214 AM CDT Fri Oct 2 2026

.KEY MESSAGES...

- Tonight will be the coldest night of the season so far with
  lows in low to mid 40s (perhaps a few spots in the upper 30s)
  away from the Chicago urban heat island.

- Extended period of dry weather with seasonable temperatures
  though much of next week.

&&

.DISCUSSION...
Issued at 214 AM CDT Fri Oct 2 2026

Rain is gradually ending from northwest to southeast early this
morning as the main trough responsible for our extended period
of rain exits eastward. Precip is now confined to primarily east
of I-57, with the remainder of the forecast area expected to be
precip-free by sunrise. Clouds will clear this morning as weak
ridging and plenty of dry air aloft advect in from the west,
leading to generally sunny skies by the afternoon.

Surface high pressure will then drift eastward across Wisconsin
and Lower Michigan this afternoon into Saturday morning. After
a cool (but seasonable) day with highs in the mid 60s today,
decoupling winds within a notably drier airmass will promote
plenty of cooling tonight. Low temperatures in the lower to mid
40s will be common away from the core of the Chicago heat
island. Would not be surprised to see some readings in the upper
30s for the typically colder spots across the northwest half of
the CWA. Will also need to keep an eye out for patchy shallow
fog toward sunrise around the Illinois/Kankakee River valleys
northward into the south and west Chicago metro where heavier
rain fell the past couple days and slightly higher lake-modified
air advects inland.

With the upper-jet displaced well to the north and persistent
high pressure cutting off Gulf moisture through next week, we
will head into a rather quiet stretch of weather. Cannot rule
out a few isolated showers with a cold front brushing the area
to the north on Sunday and again on Wednesday, but the area may
very well end up precip-free through much of next week. Temps
will be fairly seasonable during this period. Monday will likely
be the coldest night of the stretch with outlying areas
possibly falling into the upper 30s.

Kluber

&&

.AVIATION /06Z TAFS THROUGH 12Z SATURDAY/...
Issued at 1221 AM CDT Fri Oct 2 2026

Rain is coming to an end at the Chicago-area terminals. A brief
period of MVFR cigs is possible for the next few hours before
VFR conditions return. North/northwesterly winds will prevail
this morning, but will likely shift just east of north through
mid-late morning at the Chicago-area sites. Winds may
occasionally gust to around 20 kts into the afternoon but will
quickly ease during the evening to under 10 kts.

There is a small chance for some patchy shallow BR/fog into
Saturday morning, although chances and coverage remain too low
for a mention in the TAFs.

Carlaw

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...Small Craft Advisory until 4 AM CDT Saturday for the IL and IN
     nearshore waters.

&&

$$

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