textproduct: Central Illinois

KEY MESSAGES

- Conditions are expected to be drier than normal for mid-May, with weekly rainfall totals likely suppressed to approximately half an inch.

- A warming trend will bring temperatures above seasonal averages throughout the week, featuring daytime highs in the vicinity of 80 degrees and overnight lows near the upper 50s.

- Blowing dust concerns are increasing for Tuesday and Wednesday, particularly north of I-70 and east of the Illinois River. Wind gusts exceeding 30 mph are likely (50-80%) during this time. Given relatively dry soils and peak farming activity, visibility along major roadways may become notably impacted due to blowing dust.

DISCUSSION

Issued at 555 PM CDT Sun May 10 2026

(through next Sunday) Issued at 1217 PM CDT Sun May 10 2026

Surface high pressure is currently building toward the Great Lakes, situated downstream of an upper-level ridge. This setup will maintain cool and dry conditions across the region through tonight. Based on NBM deterministic guidance, overnight low temperatures are expected to drop into the low 40s.

A notable push of low-level warm advection from the Plains is expected to move into the Midwest on Monday and Tuesday, raising temperatures and dewpoints ahead of an approaching frontal boundary. According to the latest ensemble and multi-model data, there is a high probability (60-80%) of rain across the area by Tuesday evening. Mean QPF from the NBM and Grand Ensemble currently suggests light totals, generally ranging from a few hundredths to 0.25 inches. While the risk for severe weather is low, locally higher rainfall amounts could occur if the front interacts with elevated instability.

The primary concern for mid-week centers on the potential for blowing dust. Analysis of model soundings reveals deep boundary layer mixing that could generate gusts exceeding 30 mph on both Tuesday and Wednesday. This assessment is reinforced by probabilistic guidance from the GEFS, EPS, and NBM, which indicates a greater than 50% probability of such gusts occurring east of the Illinois River and north of I-70. These strong winds are expected to coincide with peak farming operations and relatively dry soil conditions. Given that anticipated rainfall on Tuesday evening may be insufficient to settle the dust, significant visibility reductions are possible on regional highways. Forecasters will continue to monitor the situation for the potential issuance of Blowing Dust headlines.

Dry weather will persist from Wednesday into early Friday as surface high pressure and an upper-level ridge become established over the area. As this pattern takes hold, a transition to much warmer conditions is expected starting Thursday, with afternoon highs trending toward the upper 80s by the end of the week.

Medium-range guidance suggests a robust surge of Gulf moisture will usher in a warmer, more humid airmass across the Midwest from late Friday through Sunday. This pattern shift is likely to initiate a period of heightened convective activity, as thermodynamic and kinematic environments potentially evolve to support severe weather. Alongside the notable warming trend, breezy southerly winds may reintroduce blowing dust concerns to portions of central Illinois toward the end of the week. However, the magnitude of these visibility impacts will largely depend on the preceding rainfall totals observed during the late-week period.

AVIATION /00Z TAFS THROUGH 00Z TUESDAY/

Issued at 600 PM CDT Sun May 10 2026

High pressure will dominate the weather pattern for the upcoming 24 hours promoting VFR conditions across the central IL terminals. Winds NNW up to 11 kts at 00Z will rapidly diminish this evening, becoming light and variable through the night. Winds will increase from the W-NW Monday morning, becoming NW 8-12 kts by 18Z.

ILX WATCHES/WARNINGS/ADVISORIES

None.