Marine Weather and Tide Forecast for West Peoria, IL

DISCUSSION
Issued at 340 AM CDT Tue Jul 28 2026

The 08Z/3 am surface map shows a weak cold front near I-72.
Isolated convection along it over our far northern CWA late Mon evening had dissipated a few hours ago and just some patchy cumulus clouds along and se of the boundary. Warm temps in the upper 70s to around 80F except 74 at Macomb and Galesburg. Moist dewpoints in the mid to upper 70s in central IL, though lower 70s arriving nw of the IL river and around 80F dewpoints se of I-70.

Latest CAMs push cold front across southeast IL by mid morning and reaching near the Ohio river by 15Z/10 am. Consensus of models keep our CWA dry with passage of cold front with winds turning northerly and slowly bringing in cooler and less humid air. MCS over southeast Nebraska to weaken as it moves se across MO today keeping its convection west/sw of IL. Highs today in the mid to upper 80s (coolest from I-74 ne) while dewpoints settle into the upper 60s/lower 70s during this afternoon. Afternoon heat indices peak in the mid to upper 90s from Springfield to Effingham to Robinson sw with heat indices topping 100F just south of CWA where heat advisory continues today for Marion, Wayne, Edwards and Wabash counties. Variably cloudy today with some passing smoke at higher levels from wildfires over the Pacific Northwest/northern Rockies. The near surface smoke models show some diffuse smoke passing southward behind cold front during this morning though current observations over IL and nearby states not showing much restriction to visibilities.

Mostly clear skies expected tonight with ample sunshine Wed as weak high pressure 1016-1018 mb settles down over WI and IL by Wed morning. Comfy lows overnight and Tue night in the lower 60s (near 60F in east central IL) with highs Wed in the low to mid 80s. Highs Thu in the mid 80s with weak surface high pressure staying near IL with light winds. Slight chance of light rain showers late Thu night over western CWA otherwise much of CWA remains dry thru Thu night. Seasonable lows Thu night in the mid to upper 60s.

Medium range models continue to show a decent northern stream short wave ridging over top of mid/upper level ridge over the central and southern Rockies/Southwest States, that develops a cutoff low near MN/IA Fri morning. This to likely spread showers and isolated thunderstorms east/se over central IL by Friday afternoon with highest pops (50-70%) from I-55 west/nw. We have 50-70% pops arriving over area Fri night and Saturday. WPC Day 4 ERO has a marginal to slight risk of excessive rainfall Fri afternoon and Fri night, with the slight risk over western half of CWA WPC Day5 ERO has marginal risk of excessive rainfall across IL Sat/Sat evening with slight risk in far se IL. SPC and Machine Learning do not have any risk area for severe wx over IL late this week as instability appears to be weak. Highs Fri in the lower 80s (near 85F at Lawrenceville) and upper 70s to around 80F on Sat. The GEM models is quicker weakening and exiting upper level low/trof se of IL by Sunday morning, though Ecmwf and GFS models linger weak cutoff 500 mb low over the mid MS/lower Ohio river valley on Sunday and Monday keeping chances of showers around especially se of the IL river. If cutoff low lingers nearby early next week, we would see cooler and wetter conditions than currently forecast by NBM projections.

The Climate Prediction Center (CPC) 8-14 Day Outlook for Aug 4-10th has a 45-55% chance of above normal temperatures over IL and precipitation trending near normal across the Prairie State.

AVIATION /12Z TAFS THROUGH 12Z WEDNESDAY/
Issued at 613 AM CDT Tue Jul 28 2026

Main aviation concern is with lower clouds advecting southwest toward central Illinois. These roughly extend from KRFD-KHUF at 11z and are expected to reach the KBMI-KCMI vicinity over the next 1-2 hours. A few hours of ceilings just above 1,000 feet are expected in this area before they begin to erode and pull eastward.

Winds have begun shifting to the north-northwest, and will be becoming more northeast over the next several hours. Speeds around 10 knots will prevail into early evening, before diminishing from west to east.

ILX WATCHES/WARNINGS/ADVISORIES
None.