Markham, Illinois Weather Forecast Discussion

822
FXUS63 KLOT 272328
AFDLOT
Area Forecast Discussion
National Weather Service Chicago/Romeoville, IL
628 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 /00Z TAFS THROUGH 06Z MONDAY/...
Issued at 628 PM CDT Sat Sep 27 2025
Only forecast concern is a cold front/wind shift tonight. West/
southwest winds under 10kts will slowly turn west/northwest this
evening, then shift northerly late this evening as a weak cold
front moves across the area. Winds are expected to turn more to
the north/northeast during the predawn hours for the Chicago
terminals. Winds will then become east/northeast later Sunday
morning with speeds to 10kt.
There may be few/sct mvfr level clouds overnight into Sunday
morning but confidence is low. If they occur, it appears the
best time will be toward daybreak when winds turn northeasterly
off of Lake Michigan. For now will continue with few mention.
Patchy/shallow ground fog will also be possible by daybreak but
confidence is too low for any mention at the terminals. cms
&&
.LOT WATCHES/WARNINGS/ADVISORIES...
IL...None.
IN...None.
LM...None.
&&
$$
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NWS LOT Office Area Forecast Discussion