Champaign, Illinois 7 Day Weather Forecast

Wx Forecast - Wx Discussion - Wx Aviation

585
FXUS63 KILX 142309
AFDILX

Area Forecast Discussion...Updated Aviation
National Weather Service Lincoln IL
609 PM CDT Thu Aug 14 2025

.KEY MESSAGES...

- Hot and humid conditions return to central Illinois starting
  Friday and peak over the weekend. Heat index values will top out
  around 100 degrees Friday followed by 100-110 degrees Saturday
  and Sunday.

&&

.DISCUSSION...
Issued at 113 PM CDT Thu Aug 14 2025

High pressure is centered over Hudson Bay today with ridging
extending south along the Mississippi River Valley. Light
northeast flow over central Illinois ahead of the ridge axis has
transported slightly lower dew points into the region with areas
north of I-72 experiencing 60 degree dew points today, while
further south, dew points are still pushing to around the 70
degree mark. Early afternoon satellite imagery shows an agitated
cumulus field stretching from near St Louis northeast along and
just north of the I-70 corridor. This would be the best corridor
for an isolated shower or storm to pop today, but this chance
remains less than the mentionable 15%. As the surface ridge axis
shifts towards the Appalachians Friday, return flow across central
Illinois will push dew points back into the 70s area wide while
temps warm back to around 90 degrees during the afternoon. The
result will be heat index values in the mid to upper 90s with a
few spots topping out in the triple digits.

Meanwhile, an upper level ridge centered over the Four Corners
region today will shift east to the middle Mississippi Valley
this weekend, while at the surface, a warm front sets up across
northern IA and along the IL/WI state line. The warm front will
be the focus for showers and storms this weekend with central
Illinois appearing to be well capped within the warm sector and
separated from the better forcing well to our north. Temps will
top out in the low to mid 90s both Saturday and Sunday while dew
points back into the mid 70s will contribute to Heat Index values
of 100-110 degrees. Heat headlines will likely be needed to be
issued within the next 24 hours to cover the dangerous heat this
weekend.

Upper ridge is expected to migrate southward through the first
half of next week with a series of shortwave troughs making a more
southerly incursion into the region with each passing wave. As
such, expect daily PoPs gradually spreading south into central
Illinois Monday through Wednesday while more seasonable
temperatures (highs in the mid 80s) also gradually work back into
the area from the north.

Deubelbeiss

&&

.AVIATION...  (For the 00z TAFs through 00z Friday Evening)
Issued at 609 PM CDT Thu Aug 14 2025

VFR conditions expected the next 24 hours. Diurnal cumulus will
fade out soon, but additional scattered clouds near 4000 feet
should begin forming again by mid to late Friday morning. Light
northeast winds will trend toward the southeast overnight.

Geelhart

&&

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

$$