textproduct: Central Illinois
This forecast discussion was created in the public domain by the National Weather Service. It can be found in its original form here.
KEY MESSAGES
- Dry and mild weather will dominate the area through early next week.
- A strong cold front will cross the region on Wednesday, bringing a chance of showers and storms. There is a 20-40% chance that lows will be below 45 degrees Thursday morning and Friday morning.
DISCUSSION
Issued at 156 AM CDT Sun Aug 31 2025
Surface high pressure continues to hang over the region until a cold front pushes through Wednesday. Showers and thunderstorms with the front will also usher in cold air briefly for Thursday into Friday morning. Most areas will be dry through Tuesday.
Highs in the upper 70s to low 80s and lows in the mid to upper 50s are expected to continue through Wednesday. Behind the cold front, CAA sets up, allowing highs to only get up into the upper 60s with lows in the 40s, starting early Thursday morning. The NBM is showing a 15-30% chance that highs get above 70 degrees Thursday north of I- 70. South of there, there is a 30-50% chance. Thursday & Friday morning will be quite chilly, with lows forecast to be in the mid 40s. There is a 20-40% chance that lows will be below 45 degrees Thursday morning and Friday morning. IF we were to see a very early first frost, those two mornings would be the best chance in very localized areas. The ground could have a pretty glistening look to them just as the sun rises. Temperatures appear to rebound by the following weekend to the 70s/80s during the day and 50s at night.
Showers and thunderstorms will move through along the front Wednesday afternoon/evening as it moves southeast across central IL. We still aren't seeing any risk for severe weather. Probabilities have increased with the current forecast showing a 40-60% chance of showers and thunderstorms Wednesday into Thursday. However, it does not look to be a big rain producer at the moment. QPF is only showing maybe a tenth of rain from the frontal passage. The NBM suggests a 20-40% chance of 0.25" accumulated rain on Wednesday.
Copple
AVIATION
(For the 12z TAFs through 12z Monday Morning) Issued at 550 AM CDT Sun Aug 31 2025
VFR conditions continue through the 12z period. Winds will be light out of the east-northeast today. High clouds are expected but brief bouts of SCT050 this morning may occur.
Copple
ILX WATCHES/WARNINGS/ADVISORIES
None.
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