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

- Pleasant Weather Through Wednesday: Dry and pleasant conditions dominate early this week with highs in the mid-to- upper 80s. Only an isolated afternoon storm is possible (20-30% chance), mainly south of Interstate 72.

- Flash Flooding Risk Thursday and Friday: A stalled front brings a high chance (60-70%) for widespread showers and storms. Torrential rainfall from repeating storms introduces a risk of localized flash flooding and isolated damaging winds.

- Uncertain Heat Potential Next Week: High uncertainty exists for mid-July. Central Illinois will either experience periodic thunderstorm complexes or a period of dangerous, excessive heat, depending on how far east a building weather ridge tracks.

Saturday through Next Week (Extended Heat & MCS Potential)

Once the stalled front finally dissipates late in the week, long- range guidance exhibits excellent agreement regarding the expansion of a high-amplitude subtropical ridge over the central United States. Medium-range ensembles (GEFS/EPS/GEPS) consistently project an anomalous upper-level high centering near the Rockies during the July 14-17 timeframe.

Sensible weather across central Illinois during the extended period will depend heavily on the exact longitudinal position of this ridge core. A more western ridge orientation would place the local area under active northwest flow aloft. This would open the door for periodic, ridge-riding Mesoscale Convective Systems (MCSs) that would temper afternoon temperatures via persistent cloud cover and convective debris. Conversely, if the ridge core migrates further eastward directly into the Corn Belt, a spell of dangerous, excessive heat could rapidly develop by mid-July.

Given the typical model variance at this time range, trends will be monitored closely over the coming forecast cycles.

AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/

Issued at 530 AM CDT Tue Jul 7 2026

VFR conditions will prevail through this TAF period as elongated surface high pressure stretches from the Great Lakes to the Corn Belt. Some isolated showers or thunderstorms are possible this afternoon, but confidence and coverage remain too low to include a PROB30 mention in the TAFs at this time. Winds will primarily be from the north or northeast between 3-7 kts through the period.

ILX WATCHES/WARNINGS/ADVISORIES

None.

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