Marine Weather and Tide Forecast for East Peoria, IL

DISCUSSION
Issued at 315 AM CDT Mon Apr 20 2026

Patches of mid level clouds around 10k ft lingered in southeast IL from I-70 south and holding temperatures up in the 40s, with mid to upper 40s along and south of highway 50. 1028 mb high pressure over Lake MI was giving clear skies and light to calm winds over central IL early this morning, with cooler temps in the 30s. Temperatures were 31F at Galesburg and Lacon, with Paris and Macomb at 32F, and NWS in Lincoln, Danville and Pontiac at 33F. The scattered mid level clouds should decrease over southeast IL through daybreak allowing temps to slip into the upper 30s to around 40F degrees by dawn. Frost looks less likely in far southern CWA, but if clearing moves in quicker may get a few degrees cooler. Continued Freeze Warning until 8 am from Fulton, Logan and Edgar counties north, with a Frost Advisory south until 8 am.

High pressure to settle just south of Lake Erie by sunset and provide ample sunshine with lighter winds today over CWA with a few passing high clouds. Light and variable winds this morning become south 5-10 mph this afternoon. Highs mostly in the lower 60s today, ranging from around 60F from I-74 northeast and mid 60s sw of Springfield, with upper 60s to near 70F near the MS river valley from Quincy to St Louis.

A warm front over Ozarks in southwest MO will lift ne across central IL overnight as low pressure just north of MT tracks into southern MN by dawn Tue. Increasing mid/high clouds during tonight along with increasing southerly winds overnight to keep it from getting as cold as recent frosty nights. Lows tonight in the mid to upper 40s (coolest near the IN border). Partly to mostly sunny skies on Tue with milder highs in the mid to upper 70s. Expect breezy sw winds gusting 25-30 mph Tue afternoon.

A weak short wave to move into the southern Great Lakes Tue night as a cold front drops down into northern parts of IL/IN.
We continued 20-30% chance of showers and thunderstorms from Quincy to Effingham north Tue evening (with 30% pops in northern third of CWA). Then 20-30% pops shift se of the IL river overnight, though southern 6 se IL counties have only slight pops and may stay dry. Lows Tue night in the mid to upper 50s.

Isolated showers and thunderstorms possible early Wed morning over mainly east central IL, otherwise a nice day in store for Wednesday as skies trend mostly sunny Wed afternoon as upper level ridge builds east over the MS river valley by days end.
Lighter sw winds 7-14 mph on Wed with mild highs in the upper 70s.

A stronger storm system off the Northern California coast to eject northeast into ND on Thu with its cold front moving east into the Central Plains. Breezy southerly winds gusting to 30 mph develop over central IL on Thu with increasing clouds from the west by Thu afternoon. Warm highs around 80F to lower 80s.

There is a chance of showers and thunderstorms mainly from I-55 west during Thu evening after sunset and spreading into eastern IL too overnight Thu night as cold front approaches the IL river valley by dawn Friday. The cold front forecast to sweep eastward over central/se IL on Friday keeping good chance of showers and thunderstorms. CSU machine learning suggests a 5% risk for severe weather over parts of CWA overnight Thu night into Friday. Moderate rainfall of half to three quarter inch with locally 1 inch or more possible especially with thunderstorms.

NBM has lower pops of 20-30% this weekend over CWA with the chance pops in southeast IL and temperate highs in the upper 60s/lower 70s. Though latest GFS, GEM and ECMWF models are trending further south with qpf (Sat into Sunday) though ECMWF spread qpf into central IL during Sunday afternoon. Extended models look more unsettled over central/se IL Sunday night and Monday Apr 27th with more chances of showers/thunderstorms and possible moderate rainfall.

The Climate Prediction Center (CPC) 8-14 Day Outlook for Apr 27-May 3 has a 40-50% chance of below normal temperatures over IL and a 33-40% chance of above normal precipitation over central and southeast IL.

AVIATION /12Z TAFS THROUGH 12Z TUESDAY/
Issued at 607 AM CDT Mon Apr 20 2026

High pressure over the area this morning is resulting in light and variable winds. Winds will set up out of the south by early this afternoon as the ridge axis shifts to our east. A SW/W low level jet of 40-50 kt will begin to overspread the region this evening resulting in LLWS tonight. VFR conditions are expected through the period.

ILX WATCHES/WARNINGS/ADVISORIES
Freeze Warning until 8 AM CDT this morning for ILZ027>031- 036>038-041>046-055-057.
Frost Advisory until 8 AM CDT this morning for ILZ040-047>054- 056-061>063-066>068-071>073.