Mc Lean, Illinois Weather Forecast Discussion

708
FXUS63 KILX 161050
AFDILX
Area Forecast Discussion...Updated Aviation
National Weather Service Lincoln IL
550 AM CDT Tue Sep 16 2025
.KEY MESSAGES...
- Hot and dry weather persists through potentially Friday, with
  daytime highs topping out in the upper 80s to low 90s.
- A slow-moving upper system will bring cooler temperatures and
  precipitation chances (20-40%) late this week through the
  weekend.
&&
.DISCUSSION...
Issued at 155 AM CDT Tue Sep 16 2025
The highs yesterday overperformed once again, likely thanks to the
clear skies and dry air. Highs continue to be in the 90s until late
in the week, dropping into the 60s overnight. We may get a brief
break in the summertime warmth soon. A slow moving upper low travels
across the region this weekend, breaking down the upper ridging that
has been in place for the last week. Highs will become more
seasonable for the weekend, dropping down into the upper 70s to mid
80s.
The next 3 days will remain dry. The models have continued the
slower progression of the system later this week. POPs increase by
Friday to a 40-50% chance for showers and thunderstorms. Daily
chances for rain exist into the beginning of next week. No relief
for the drought is expected anytime soon. The probabilistic NBM is
showing a 20-40% chance of an inch during the Friday 12z to Monday
12z, 72 hour period.
The global models are hinting at more ridging setting up behind this
weekend`s more progressive system. Dry weather and unseasonably warm
temperature to return potentially. The CPC continues to hold on to
the above normal temperature outlook through the next 3-4 weeks.
Normal highs for mid to late September are around the mid 70s to low
80s and lows in the low to mid 50s.
Copple
&&
.AVIATION...  (For the 12z TAFs through 12z Wednesday Morning)
Issued at 550 AM CDT Tue Sep 16 2025
VFR conditions under mostly clear skies and light east winds will
continue through the 12z period.
Copple
&&
.ILX WATCHES/WARNINGS/ADVISORIES...
None.
&&
$$

NWS ILX Office Area Forecast Discussion