Chillicothe, IL Marine Weather and Tide Forecast
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Marine Weather and Tide Forecast for Chillicothe, IL

June 19, 2024 9:39 AM CDT (14:39 UTC) Change Location
Sunrise 5:25 AM   Sunset 8:34 PM
Moonrise 6:42 PM   Moonset 3:10 AM 
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7 Day Forecast for Marine Location Near Chillicothe, IL
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Area Discussion for - Central Illinois, IL
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Area Forecast Discussion...Updated Aviation National Weather Service Lincoln IL 556 AM CDT Wed Jun 19 2024


- Hot and humid conditions will continue across central and southeast IL into this weekend. The hottest conditions will arrive Friday and Saturday when air temperatures climb into the middle to upper 90s, and heat index values peak near or just above 100 degrees.

- Isolated thunderstorms will be possible mainly northwest of the IL river this week, with a better chance for thunderstorms arriving Saturday night into Sunday as a cold front moves through Illinois.

Issued at 400 AM CDT Wed Jun 19 2024

Early morning surface map shows large high pressure anchored off the mid Atlantic and New England Coast and ridging back into the lower Ohio and mid MS river valley. A frontal boundary extended from central WI through central parts of Iowa and Kansas to 1001 mb low pressure in central NM. Convection was over central IA and nw MO into central KS, nw OK an far northern Texas. An outflow boundary was producing a narrow band of showers and isolated thunderstorms in southeast Iowa into north central MO. Very light showers were noted east of IL over mainly central/eastern Indiana and southeast lower MI. Water vapor loop shows tropical plume of moisture from the central/western Gulf of Mexico had shifted mainly east of IL over IN and Ohio. Subsidence noted nw of I-55.
IR satellite shows broken to overcast mid level clouds along and east of I-55 with clear to partly cloudy skies west of I-55. Mild temperatures were in the low to mid 70s with muggy dewpoints in the upper 60s and lower 70s. Peoria tied another record warm low of 75F on June 18, which was originally set in 2018.

A strong 597 dm 500 mb ridge over the mid Atlantic region and sw New England was ridging back into the mid and lower MS river valley. Latest forecast models continue to build the upper level ridge westward next few days, with 500 mb height rising to 593-595 dm over central/se IL this afternoon, and up to 595-597 dm on Thu. Latest CAMs show isolated convection possible this afternoon nw of the IL river and near the Indiana border. SPC has shifted marginal risk of severe storms ne of IL from eastern Indiana ne across the southern Great Lakes and into northern New England. Isolated convection possible again Thu afternoon north of Peoria. Most areas will remain dry through Saturday. Main weather story will be the high heat and humidity that continues into this weekend. Highs today in the lower 90s with afternoon heat indices in the mid to upper 90s. SSW winds will not be as breezy as past two days so providing less relief from the high heat and humidity.
Lows tonight in the lower 70s. Highs Thu in the low to mid 90s with afternoon heat indices of 95-100F. shows an orange category (Unhealthy for sensitive groups) appearing over the Wabash river valley over eastern/se IL (similar to this past Monday) with an air quality alert over much of Indiana from midnight tonight through midnight Thu night.

Friday and Saturday will likely see the hottest temperatures with highs in the mid 90s and a few areas reaching upper 90s.
Afternoon heat indices around 100 will be common and Saturday could surpass 100F similar to conditions we had this past Monday.
Will issue another special weather statement to address this heat wave into this weekend.

A stronger upper level trof moves into the Midwest during this weekend finally pushing the strong upper level ridge southward and allowing a cold front to push se through nw IL overnight Sat night and thru central/se IL around Sunday as it weakens on Sunday.
Will see increasing chances of convection from nw to se during Sat night, with 20-30% pops se of the IL river on Sunday. Heavier rains appear to be nw and north of CWA late Sat afternoon and Sat night and may be dealing with strong to severe storms over IL river valley Sat evening. Highs Sunday in the lower 90s with heat indices in the low to mid 90s in central IL and upper 90s in southeast IL. Monday looks like a drier day as dewpoints could slip into the upper 50s/lower 60s with highs in the upper 80s to around 90F. Upper level ridge building back over IL next Tue/Wed with sw flow returns heat and humidity with highs back in the low to mid 90s and heat indices in the mid 90s to around 100F possible again.

The Climate Prediction Center (CPC) 8-14 Day outlook for June 26 through July 2 has 60-70% chance of above normal temperatures over IL. Currently through June 18, temperatures are 1.5-3 degrees above normal in central IL, and we will likely be even more above normal by months end.


(For the 12z TAFs through 12z Thursday Morning)
Issued at 555 AM CDT Wed Jun 19 2024

VFR conditions to continue across the central IL airports through 12Z/7 am Wed. Broken to overcast mid level clouds with bases around 10k ft from I-55 east to scatter out during late morning and early afternoon while few to scattered cumulus clouds with bases around 5k ft develop. Isolated convection possible this afternoon nw of the IL river, but kept PIA dry as convection appears to stay nw of this airport with nearest convection currently near the Quad cities and lifting ne. South winds 7-12 kts today and around 5 kts or less after sunset and SSE to SE direction.



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AirportDistAgeWind ktVisSkyWeatherAirDewPtRHinHg
KPIA GENERAL DOWNING PEORIA INTL,IL 20 sm45 minSSW 1210 smClear82°F72°F70%30.20
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Central Illinois, IL,

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