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
- A Dense Fog Advisory will remain in effect along and north of a Springfield to Danville line through 9am. - Fog will re-develop across central Illinois tonight as a warm front approaches from the south. There is a 50-80% chance that visibilities will once again drop below 1 mile.
- After a windy and warm day with highs well into the 70s on Friday, a cold front will trigger a broken line of thunderstorms Friday night. There is a Slight Risk (15-30% chance) of severe weather...with the primary risk being damaging wind gusts.
LONG TERM
(Saturday through Wednesday) Issued at 354 AM CST Thu Mar 5 2026
The cold front will work its way across central Illinois Saturday morning, followed by a return to dry and slightly cooler weather for Saturday afternoon and Sunday. After chilly morning lows in the 30s, the dry Pacific-origin airmass will heat sufficiently to produce Sunday afternoon highs in the upper 50s and lower 60s. After that, warmer conditions will return early next week thanks to southwesterly flow. Highs will climb back into the 70s on Monday and Tuesday...and rain chances will return as well. While there are still some timing discrepancies among the synoptic models at that range, consensus points to Monday night through Wednesday morning as the wettest period as another storm system traverses the region.
Barnes
AVIATION
(For the 06z TAFs through 06z Thursday Night) Issued at 1054 PM CST Wed Mar 4 2026
Widespread IFR/LIFR conditions will prevail into late morning, with ceilings likely to stay around 500 feet or less. Ceilings will begin to gradually improve by early afternoon, becoming MVFR by 20-21z.
Dense fog has been prevalent overnight and is expected to continue into mid morning. However, there may be some temporary improvement as a shower/TS impacts a TAF site this morning.
Periods of showers and a few thunderstorms are expected as well. Confidence in thunder or showers around KPIA/KBMI is much lower, but TEMPO groups have been included further south for between about 06-10z. Showers may linger longer into mid morning but by the afternoon all sites will dry out.
Copple
ILX WATCHES/WARNINGS/ADVISORIES
Dense Fog Advisory until 9 AM CST this morning for ILZ027>031- 036>038-040>051-053.
Flood Watch until 9 AM CST this morning for ILZ062-063-066>068- 071>073.
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