640
FXUS63 KILX 120710
AFDILX

Area Forecast Discussion
National Weather Service Lincoln IL
210 AM CDT Sat Jul 12 2025

.KEY MESSAGES...

- Thunderstorms will move across southeastern IL this afternoon.
  Areas of heavy rainfall are the main threat for isolated
  flooding, especially if it falls in urban and poor drainage
  areas. SPC has a marginal risk of damaging winds as well.

- Hot and humid conditions will be in place again today and again
  early next week. Temperatures look to trend slightly cooler by
  the end of next week.

&&

.DISCUSSION...
Issued at 210 AM CDT Sat Jul 12 2025

The trailing stratiform rain region is slowly deteriorating this
morning. It has mostly hung along and west of the I-55 corridor. The
barely existant line of showers is now moving east of the I-57
corridor. Not much convection is left and lightning has been
limited. As this erodes this morning, drier weather over much of
central IL is expected today.

There is a marginal risk of severe weather that expands south-
southeast of a Danville to Vandalia line. HRRR shows storms
developing along I-57 and moving east, whereas the NAMNest is
slightly further south showing a complex of storms developing south
of I-72 this afternoon. These storms are forecast to develop around
20z (3pm). They hold the potential for damaging winds up to 60 mph.
We could see some heavy rain south of I-70, where PWATs are around 2
inches.

After those storms move out, a cold front will sweep through the CWA
this evening. Some of the CAMs are showing some showers or
thundershowers developing along the front after 00z. They could drop
up to an inch of rain locally for some lucky few. PWATs aren`t
nearly as high as they have been, but they are still around 1.6-1.8
inches.

Behind the cold front, much less humid air moves in, but not much
cooler temperatures. Today the highs are in the mid 80s to low 90s,
and that will be the general theme into the new week. The hottest
day of the week looks to be Wednesday, with highs around 90 and heat
indices of 95-105 degrees.

The next best chance for rain and storms come Tuesday with a 40-50%
chance and Wednesday with a 60-70% chance. A lot like last week,
most days have a non-zero chance for showers and thunderstorms, but
nothing looks to be organized, just messy convection. It is mid-July
after all.

Copple

&&

.AVIATION...  (For the 06z TAFs through 06z Saturday Night)
Issued at 1212 AM CDT Sat Jul 12 2025

A decaying line of thunderstorms with a preceding gust front with
winds gusting 30-40kt out of the west/northwest is moving across
central Illinois during the early overnight hours. Some rain may
linger over the region through around 09Z but the more intense
storms have ended across central IL. Winds will go light and
variable for a few hours behind the gust front, then will set up
out of the northwest around 10 kt by mid to late Saturday morning.
A period of MVFR ceilings is expected around this same time, and
should scatter back to VFR early afternoon. Storms are expected to
redevelop Saturday afternoon, though confidence on station
remains low with better chances for storms to form east/southeast
of the terminals. Still, a prob30 will cover this chance at
DEC/CMI.

Deubelbeiss

&&

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

$$