Wednesday, September30, 2020
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Marine Weather and Tides
Chillicothe, IL

Version 3.4
NOTICE
8/26/2020 The 7 day forecast is taking about 5 seconds to load but it will eventually load. NOAA is still working on it.
8/18/2020 NOAA continues to have trouble. Wind guest will occasionally be left off graphs. I am working with NOAA to resolve the issue.
12/16/2019 NOAA is having trouble with requests that include wind gusts. I am posting graphs without wind gusts until it gets fixed.
10/9/2019 Updated the Marine Zones.
9/4/2019 Fixed the weather maps due to NOAA moving them.
7/25/2019 New feature in the Airports section gives a link to 5 minute updates for data reports.

Sunrise 6:53AMSunset 6:42PM Wednesday September 30, 2020 9:41 AM CDT (14:41 UTC) Moonrise 6:38PMMoonset 5:29AM Illumination 97% Phase: Waxing Gibbous; Moon at 13 days in cycle
NOTE: Some of the data on this page has not been verified and should be used with that in mind. It may and occasionally will, be wrong. The tide reports are by xtide and are NOT FOR NAVIGATION.
Marine Forecasts
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7 Day Forecast for Marine Location Near Chillicothe, IL
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location: 40.91, -89.51     debug


Area Discussion for - Central Illinois, IL
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FXUS63 KILX 301058 AFDILX

Area Forecast Discussion National Weather Service Lincoln IL 558 AM CDT Wed Sep 30 2020

SYNOPSIS. Issued at 345 AM CDT Wed Sep 30 2020

Windy conditions will occur today with variable cloud cover. Isolated light rain showers are possible from I-74 north this morning as a cold front moves southeast through the area today. There will be another chance of light rain showers Thursday afternoon northeast of Lincoln with partly to mostly cloudy skies Thursday. A brief warm up will occur today, with much cooler temperatures expected Thursday through this weekend. A better chance of rains showers will arrive from later Saturday into Sunday as a weather system moves through the area.

SHORT TERM. (Today and tonight) ISSUED AT 345 AM CDT Wed Sep 30 2020

Early morning surface map shows a cold front extending from central WI thru nw IA and central Nebraska. Pressure gradient was tightening across CWA this morning and will lead to a windy day today. A large area of mid level clouds covered much of IA with some showers over northern half of IA into far southern MN. Some patches of mid level clouds over central and northern IL early today. SW winds were holding temps nearly steady past few hours in the upper 40s and lower 50s over CWA. Aloft a strong 537 dm 500 mb low was over western Ontario between Lake Superior and Hudson Bay while a strong 594 dm 500 mb high was along the AZ/NM and Mexico border and ridging into WA/OR. IL was firmly in NW upper level flow and its weather will be influenced by the strong upper level trof/low rest of this week.

The CAMs bring the cold front quickly se into the IL river valley late this morning and thru southeast IL by late afternoon. Most of the CAMs show some light qpf skirting north/ne third of CWA this morning and carried 20-30% chance of light rain showers north of Lincoln as cloud increase. SW winds ahead of cold front to warm temps quickly into the upper 60s northern/nw CWA, lower 70s central CWA and mid to upper 70s in southeast IL. SW winds turn NW during this afternoon and have wind gusts of 30-40 mph north of I-70 and up to 30 mph in southeast IL. Clouds to decrease behind the cold front during this afternoon.

Winds diminish during this evening and back WSW during tonight as pressure gradient weakens. Fair skies tonight with seasonably cool lows in the low to mid 40s.

LONG TERM. (Thursday through Tuesday) ISSUED AT 345 AM CDT Wed Sep 30 2020

The 00Z forecast models continue to dig a strong upper level trof southward into IL on Thu with a northern stream short wave bringing a chance of showers to ne half of CWA by Thu afternoon. Even isolated thunderstorms are possible in northeast/northern IL where steeper lapse rates. Skies to become partly to mostly cloudy by midday Thu with breezy nw winds 15-25 mph. Cooler highs Thu range from the upper 50s northern CWA to the mid 60s in southeast IL. Skies become mostly clear during Thu evening as nw winds once again diminish as 1027 mb high pressure builds southward over the Central and Eastern Plains. Colder lows Thu night around 40 over much of CWA with some upper 30s north of I-72.

High pressure drifts east into the MS river valley during Friday while the large upper level trof lingers over the central and eastern US. Skies become partly sunny by Friday afternoon with cool highs in the mid to upper 50s central IL and lower 60s in southeast IL. High pressure ridge over IL Fri evening and shifts east of IL by overnight Fri night. Lows Fri night of 35-40 degrees, coolest in eastern IL closer to high pressure ridge. Frost will be more likely overnight Fri night into early Sat morning especially in eastern IL.

Clouds increase Sat morning as a northern stream short wave diving se into the Midwest on Saturday to bring next chance of showers to western half of CWA from I-55 west Sat afternoon and across the area Sat night into Sunday. Isolated thunderstorm chances should be sw of St Louis late Sat afternoon and Sat night. Rain shower chances diminish over western CWA Sunday afternoon to slight chance. Lingered slight chance of showers east of I-57 Sunday evening as wx system passes east of IL over the Ohio river valley. Model difference with how fast large upper level trof shifts east of IL early next work week with Ecmwf and GEM models slower moving it east than the GFS. Most models continue to keep it dry with a warming trend from Mon thru Wed as temps moderate closer to normal by the middle of next week. Cool highs Sat and Sunday in the upper 50s/lower 60s. Highs in the low to mid 60s Monday, then warming into the upper 60s/lower 70s Tue and 70-75F next Wed.

AVIATION. (For the 12Z TAFS through 12Z Thursday morning) Issued at 555 AM CDT Wed Sep 30 2020

VFR conditions are forecast to continue through 12Z/7 am Thursday across the central IL airports. LLWS (2k foot sw winds 40-50 kts) has shifted east of I-57/CMI at sunrise this morning, so will leave LLWS out of the 12Z TAFs with the aviation package. A cold front over se Iowa, approaching nw IL at dawn, will quickly sweep se across central IL later this morning and early afternoon. SW winds 7-14 kts early this morning will increase to 15-20 kts with gusts of 26-33 kts by late morning and afternoon and switch nw with passage of cold front. Winds veer west and diminish quickly to 5-10 kts this evening and continue overnight. Broken mid level clouds with bases of 8-12k ft are already moving ESE into PIA and BMI early this morning and will reach I-72 in next 1-2 hours. Have vcsh along I-74 during mid/late morning especially at PIA and BMI. Mid level clouds to scatter out later this afternoon though more broken mid level clouds could arrive from the nw during overnight.

ILX WATCHES/WARNINGS/ADVISORIES. NONE.



SYNOPSIS . 07 SHORT TERM . 07 LONG TERM . 07 AVIATION . 07


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Marshall County Airport, IL10 mi67 minN 010.00 miLight Drizzle53°F49°F88%1005.1 hPa
Peoria - General Downing-Peoria International Airport, IL19 mi48 minWSW 510.00 miLight Rain54°F46°F77%1006.6 hPa

Link to 5 minute data for KC75

Wind History from C75 (wind in knots)
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Last 24hrCalmCalmW3W6W6CalmCalmCalmCalmCalmCalm----CalmCalmCalmCalmCalmCalmCalmCalmW3CalmSW3
1 day agoCalmW5W6W10
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W5CalmNW4CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalm
2 days agoCalmCalmCalmNW7N10
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N3NW3NW5CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmW4Calm

Tide / Current Tables for
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Tide / Current Tables for
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Weather Map
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NOTE: East coast views moved to GEOS-16. They are experimental and not well supported by NOAA so they may not be correct so be warned. This change required redoing a large amount of the GOES code. If the image you are expecting is not showing, please let me know. You may need to use the EDIT function to update your location.
Link to Loop

Other links: Northern Pacific     Contential US     Full GOES-East
Ground Weather Radar Station Central Illinois, IL
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