720
FXUS63 KILX 172335
AFDILX

Area Forecast Discussion
National Weather Service Lincoln IL
635 PM CDT Mon Aug 17 2026

.KEY MESSAGES...

- Cooler and less active weather is on deck for this week, but
  it won`t be completely dry. There is a 50-70% chance for
  showers and thunderstorms tomorrow night through Wednesday
  night as a front pushes south across the area and stalls near
  southern Illinois.

- Temperatures for the next 7 days will be in the upper 70s to
  lower 80s for highs and 60s for lows. The CPC 6-10 and 8-14
  day outlooks show a 40-60% chance of above normal temperatures
  returning through the end of the month.

&&

.DISCUSSION...
Issued at 144 PM CDT Mon Aug 17 2026

Dry and much cooler weather will continue one more day through
tomorrow as high pressure moves across the area. Overnight lows
should be around 60 with highs tomorrow ranging from 80 to 85.
Tomorrow afternoon, and frontal boundary will begin to push
toward northwest IL with a chance of showers and storms in the
far northwest to northern parts of the CWA. This will last into
tomorrow evening, but then after midnight, these showers and
storm will finally begin moving to the southeast into the rest
of central IL. POPS increase late tomorrow night into Wed
morning as a wave along the front moves across areas south of
I-72/Danville. These high pops will continua into Wed afternoon
across the central part of the CWA and then into out southeast
for Wed night. Another break in the weather is then expected
Thur and Thur night as another high pressure moves across the
area. After this high pressure passes, sporadic small chances
of precip return for the end of the week and into the
weekend. Though precip will be possible, lots of areas will see
dry weather as well.

Through the forecast period much cooler temperatures are
expected. High temperatures will be in the upper 70s to lower
80s, while lows should remain in the 60s. Looking at the next
6-10 and 8-14 days, the forecast shows above normal
temperatures through the end of the month.

&&

.AVIATION /00Z TAFS THROUGH 00Z WEDNESDAY/...
Issued at 631 PM CDT Mon Aug 17 2026

High pressure will move across the region overnight. Northwest
winds currently in place will continue to diminish and go light
and variable by late tonight. Light winds and clear skies will
allow for fog to develop early Tuesday morning, especially
across east central Illinois. A modest southwest breeze will set
up Tuesday morning and eventually increase to around 10 kt
during the afternoon. Showers and storms are expected Tuesday
evening, but beyond the current valid period.

&&

.ILX WATCHES/WARNINGS/ADVISORIES...
None.

&&

$$

KEY MESSAGES...Auten
DISCUSSION...Auten
AVIATION...Deubelbeiss