450
FXUS63 KLOT 132052
AFDLOT

Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
252 PM CST Thu Nov 13 2025

.KEY MESSAGES...

- Unseasonably warm weather expected Friday and Saturday.

- Slight chance (20%) for light rain/sprinkles near southern
  Lake Michigan Saturday.

- Precipitation chances return Monday night into Tuesday of next
  week.

&&

.DISCUSSION...
Issued at 252 PM CST Thu Nov 13 2025

An upper-level ridge axis will shift eastward into the western
Great Lakes late Friday into early Saturday. This in combination
with the return to southerly low-level flow along the western
periphery of a surface high pressure will promote a period of
unseasonably warm weather across our area for Friday and on
Saturday. High temperatures on Friday should largely end up in
the 60s, as a northward surge in low-level moisture through the
day drives surface dewpoints through the 40s into the low 50s by
sunset. Dewpoints will remain in the low 50s Friday night, acting
as a floor for overnight low temperatures. Accordingly, expect a
rather warm night for mid November.

The unseasonable warmth continues in advance of an approaching
cold front on Saturday. However, low-level cloud cover may start
the day, along with the non-zero potential for a few light
showers or even drizzle. Otherwise, breezy southwest winds will
turn northwesterly in the afternoon following the cold frontal
passage. The colder airmass will lag the cold frontal passage, so
afternoon temperatures are expected to top out well into the 60s
to around 70.

Dry and cooler, more seasonable temperatures are slatted to return
for Sunday in the wake of Saturday`s frontal passage. These cooler
temperatures are expected to persist into next week, though we
will also have a couple of increased chances for precipitation
next week. The first will come Monday into Tuesday as a
disturbance ejects out across the Mid-Mississppi Valley. Currently
it appears the P-Types may favor mainly rain with this
disturbance. However, the column looks to be precariously close to
supporting some wet snow across northern IL, so this something we
will have to keep an eye on. Given the uncertainty this far out,
I opted to not alter the NBM chances for just RA.

Our next threat of precipitation looks to come later in the week
in response to a larger trough and associated storm system
shifting out across the Plains and into the Mid-Mississipi Valley
region. Not surprising, there is still a large deal of ensemble
spread with this system, which does limit confidence in a more
precise timing of precipitation. Nevertheless, there is a notable
signal in the guidance supporting a period of wetter weather
in our general region later next week.

KJB

&&

.AVIATION /18Z TAFS THROUGH 00Z SATURDAY/...
Issued at 1108 AM CST Thu Nov 13 2025

Southwesterly winds under 10 kts will prevail this afternoon
with increasing VFR cloud cover around 10 kft agl. Winds
tonight will become southerly to southeasterly. There is a small
chance for a little BR near RFD and perhaps GYY as moisture
begins to increase overnight and into Friday morning. Latest
indications are that winds just off the surface will likely
remain a bit too high for BR development, however, with no
mention in the current TAFs. VFR conditions with southwesterly
winds will prevail on Friday.

Carlaw

&&

.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...None.

&&

$$

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