textproduct: Central Illinois

KEY MESSAGES

- There is some patchy fog this morning where the rain had fallen over the last day, skies are clearing out, and winds are lightest. It could become dense at times. Please use caution when driving this morning.

- Additional showers and thunderstorms will develop behind a cold front late this afternoon and will continue into the overnight hours. QPF is showing up to a tenth of additional rainfall into tomorrow morning.

- While there will be a brief warmup today (highs reaching 75-80 degrees), a more substantial warming trend will hold off until mid to late next week.

DISCUSSION

Issued at 208 AM CDT Sat May 9 2026

Lingering showers have been moving south of of I-70 this morning. These will come to an end in the next few hours, with a brief break before the next arrives in the forecast area this evening. There is some patchy fog developing currently where the rain had fallen over the last day, skies are clearing out, and winds are lightest. It could become dense at times. Please use caution when driving this morning.

Additional showers and thunderstorms will develop behind a cold front late this afternoon and will continue into the overnight hours. The coverage doesn't look to be widespread and amounts will be pretty light. QPF is showing up to a tenth of additional rainfall into tomorrow morning.

The forecast is mostly benign over the next week as broad upper ridging drifts eastward. A brief warm up today into the 80s, then cooling back into the 60s for the new week behind that cold front this afternoon. A gradual warm up looks to be on deck through the next week. By next Saturday, we have 90 degrees in the forecast. The NBM is showing a 20-30% chance of highs being above 90 degrees next Saturday.

Several periods of precipitation chances are in the forecast after today. The best of those chances look like Tuesday with 20-40% chances areawide. Then again on Thursday (20-30% chance), mainly north of I-70. There aren't any severe chances in the forecast at this time for the next 8 days.

AVIATION /06Z TAFS THROUGH 06Z SUNDAY/

Issued at 0530 AM CDT Sat May 9 2026

Fog with LIFR/VLIFR visibilities shouldn't last too much longer after 12z as west- southwest winds quickly increase by mid morning. Winds become breezy by late morning/early afternoon ahead of an approaching cold front. Winds ease and shift to the north- northwest this evening with scattered showers developing near and behind the front. PROB30s have been added for each site for the shower activity behind the front. The showers will linger until near the end of the period.

ILX WATCHES/WARNINGS/ADVISORIES

Dense Fog Advisory until 8 AM CDT this morning for ILZ029-031- 036>038-040>057-061>063-066.