textproduct: Central Illinois

KEY MESSAGES

- No significant weather is expected across central Illinois for the next week.

DISCUSSION

Issued at 246 AM CST Fri Nov 6 2026

Low clouds continue to blanket central Illinois early this morning...with patchy drizzle persisting along/south of a Macomb to Bloomington-Normal line according to 08z radar imagery and local obs. While murky conditions are currently in place, IR satellite imagery indicates significant clearing upstream across Wisconsin into northern Illinois. Based on satellite trends and the latest HRRR/RRFS data, it appears the clouds will begin to break across the far northern KILX CWA around Galesburg and Lacon by 12z/6am...then further south to the I-72 corridor by mid-morning. As drier air flows southward courtesy of N/NW winds gusting 15-20mph, skies are expected to become mostly sunny across the board by afternoon. Despite the increasing sunshine, below normal temperatures will prevail..ranging from the upper 40s far north to the middle 50s south of I-70. As high pressure builds southward into the region, clear skies and diminishing winds will allow excellent radiational cooling conditions to develop tonight. As such, have undercut NBM guidance by a few degrees as low temperatures bottom out in the upper 20s and lower 30s. The cool weather will continue into Saturday as afternoon highs only reach the lower to middle 50s and overnight lows once again drop into the upper 20s and lower 30s.

As high pressure shifts eastward into the Ohio River Valley, S/SW return flow will bring a robust warming trend by early next week with highs reaching the lower 60s on Sunday...then the middle to upper 60s by Monday and Tuesday. After a period of zonal flow across the CONUS, short-wave energy rotating around a deep upper low centered over eastern Canada will carve a significant trough over the Great Lakes/New England by the end of the week. As the flow becomes more northerly, a cold front will drop through central Illinois Wednesday night into Thursday, followed by a return to cool weather with highs in the 50s by next Thursday/Friday. While deep-layer moisture will be limited, several models are hinting at the possibility of a few light showers associated with FROPA and the increasingly cyclonic flow aloft. The 00z Nov 6 NBM has included 20 PoPs accordingly.

AVIATION /18Z TAFS THROUGH 18Z SATURDAY/

Issued at 1123 AM CST Fri Nov 6 2026

Cloud heights have slowly been rising the last several hours, though some MVFR ceilings linger at midday. The areas north of KSPI-KCMI have largely scattered out, but some brief ceilings may linger another hour or two as diurnal development continues. Overall, a clearing trend should take place through the afternoon. North winds have been breezy, with gusts over the last couple hours 15-20 knots as skies became partly sunny, but these are expected to settle down late afternoon close to sunset.

ILX WATCHES/WARNINGS/ADVISORIES

None.