Saint Charles, Illinois Weather Forecast Discussion

522
FXUS63 KLOT 271935
AFDLOT
Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
235 PM CDT Sat Sep 27 2025
.KEY MESSAGES...
-  Dry and unseasonably warm daytime conditions through next
   week will lead to worsening drought.
&&
.DISCUSSION...
Issued at 235 PM CDT Sat Sep 27 2025
Enhanced and persistent mid and upper level ridging associated
with a blocking type pattern across the eastern CONUS will
continue to support unseasonably mild and dry continues across
our region for the foreseeable future. Accordingly, no impactful
weather is anticipated through the next 7 days, though drought
conditions will continue to deteriorate.
In the near term, a weak cold front will drop southward in
across the area tonight then wash out into Sunday. There will not
be much of a noticeable impact from this front other then an
east-northeasterly wind shift into early Sunday morning, along
with the possibility of a few early morning lower clouds and
patchy shallow ground fog. Otherwise, an expansive area of high
pressure will become established over northeastern North America
this week. This will ultimately favor the larger scale synoptic
flow to favor persistent onshore easterly winds through much of
the upcoming week. Accordingly, we can expect the lake cooling
footprint to spread relatively far inland each day, which should
keep conditions near the lake generally in the 70s for highs,
while interior areas top out in the 80s.
KJB
&&
.AVIATION /18Z TAFS THROUGH 00Z MONDAY/...
Issued at 1239 PM CDT Sat Sep 27 2025
There are no significant aviation forecast concerns for the
current TAF period.
A weak cold front should cause a northwesterly wind shift sometime
after sunset, though wind magnitudes should be under 10 kts on
both sides of the front by this time. A northeasterly or
easterly wind direction is then expected to prevail during the
daytime tomorrow as a lake breeze sharpens over the Chicago
metro with wind speeds remaining at or below 10 kts, for the
most part.
Couldn`t rule out some patchy shallow fog development somewhere
in the area once again tonight/early tomorrow morning (greatest
likelihood at RFD again), but the likelihood of this occurring
at any one TAF site remains too low to formally advertise any
visibility reductions in the going TAFs. There may also be some
clouds with bases at or below 3000 ft AGL that are observed
behind the front or along the lake breeze tomorrow, though
rather scarce low-level moisture should tend to keep the
coverage of these lower clouds FEW or SCT.
Ogorek
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...None.
&&
$$
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NWS LOT Office Area Forecast Discussion