textproduct: Central Illinois

KEY MESSAGES

- Above normal temperatures, with highs generally in the upper 40s to low 50s Monday and Tuesday. Temperatures will trend closer to normal, but still above normal, Wednesday through Saturday.

- Higher (40-50%) precipitation chances will exist late Thursday and again on Saturday (30-50% chance). With diurnal temperature swings crossing the freezing mark each day, some of this may fall as a wintry mix.

DISCUSSION

Issued at 134 PM CST Sun Feb 8 2026

High pressure has shifted east today. Highs today in the mid 30s to low 40s. This warm up will continue into tomorrow as we get another good push of warm air into the region. There is some uncertainty in just how warm we will get over the next two days. Monday, the HREF shows a 40-60% chance of highs above 45 degrees southwest of a Havana to Olney line, with the NBM having slightly higher probabilities. Tuesday, the amount of cloud cover and the state of the decaying cold frontal passage will be the deciding factor in how warm we get. The LREF shows a 40-60% chance of greater than 50 degrees south of a Litchfield to Robinson line. However, the NBM shows a 50-80% chance southwest of a Macomb to Terre Haute line for Tuesday's highs.

Recent runs of the GFS and Euro are depicting the precipitation Tuesday night remaining well to the south of the forecast area. So the next best chance for any precip comes Thursday night (40-50% chance) and again Saturday (30-50% chance). With the shortwave Thursday night, precipitation amounts will be pretty minimal with only a 10-20% chance (NBM/LREF) of 0.5 inch of QPF. The bigger push of precipitation will come Saturday into Sunday morning. There is a 20-30% chance of more than an inch of QPF south of I-70. For both rounds, rain, snow, and (potentially) a wintry mix are possible. Especially as the temperatures get near or below freezing in the overnight hours. Thursday, there is a 20-30% chance of exceeding an inch of snow north of I-70.

After Tuesday, temperatures remain above normal by a few degrees during the day with well above normal lows overnight. Highs will remain in the upper 30s to mid 40s through the remainder of the week. Lows in the upper 20s to low 30s.

Copple

AVIATION

(For the 00z TAFs through 00z Monday Evening) Issued at 501 PM CST Sun Feb 8 2026

High pressure departing the area will continue to bring mostly clear skies overnight, then increasing high clouds will arrive Monday as a frontal system approaches the area. Winds SE 8-12 kts this evening, decreasing overnight, then shifting to S 5-10 kts by 18Z.

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ILX WATCHES/WARNINGS/ADVISORIES

None.