Sunday, April18, 2021
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Marine Weather and Tides
Chillicothe, IL

Version 3.4
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1/26/2021 -- The West Coast Satellite images havd been updated. They now use GEOS-17.
1/1/2021 -- The 7 day forecast are now working well. Thank you NOAA for your support.

Sunrise 6:12AMSunset 7:42PM Sunday April 18, 2021 3:07 PM CDT (20:07 UTC) Moonrise 10:17AMMoonset 1:12AM Illumination 43% Phase: First Quarter Moon; Moon at 7 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 181736 AFDILX

Area Forecast Discussion National Weather Service Lincoln IL 1236 PM CDT Sun Apr 18 2021

SYNOPSIS. Issued at 1029 AM CDT Sun Apr 18 2021

Partly sunny and mild conditions will be observed across central Illinois today with high temperatures reaching the lower to middle 60s. Widely scattered showers and thunderstorms will be possible this afternoon: however, most locations will remain dry.

UPDATE. Issued at 1029 AM CDT Sun Apr 18 2021

15z/10am surface analysis shows a trough axis along the Illinois River. Ahead of the trough, winds are generally out of the S/SW and dewpoints are in the lower to middle 40s. Meanwhile behind the boundary, winds veer to NW and dewpoints drop into the lower to middle 30s. The trough axis will serve as the forcing mechanism for widely scattered afternoon convection . particularly east of the I-55 corridor. Areal coverage will remain low, but will become a bit more robust by mid to late afternoon as an upper low evident on latest water vapor imagery near Kansas City pivots eastward and enhances synoptic lift. With 500mb temps about 3-4 degrees cooler than they were yesterday morning, mid-level lapse rates will become steeper this afternoon . resulting in a few rumbles of thunder with any cells that develop. Have updated the forecast to focus 30-40 PoPs ahead of the trough axis east of I-55 . with just slight chance PoPs for a stray shower further west across the remainder of the KILX CWA.

SHORT TERM. (Today and tonight) ISSUED AT 255 AM CDT Sun Apr 18 2021

Partly cloudy skies along with light winds and mild temperatures dominated the area overnight. 2 AM readings were in the low to mid 40s. 00z 500 mb analysis depicted a trof axis from the Michigan UP southwest into the central Plains. Within the trof, water vapor imagery indicated a shortwave swirling into western IA. As this feature tracks east today, expect diurnal heating- induced isolated to widely scattered afternoon showers. With a few hundred J/kg of MUCAPE available will keep isolated thunder mention this afternoon area-wide and early evening south of I-70. Dry air below 800 mb will allow for evaporative cooling under the base of the showers/storms, and brief 25-35 mph wind gusts. Highs will be similar to the last few days in the lower 60s. Showers will fade during the early evening and with light southwest flow lows should fall into the lower 40s.

LONG TERM. (Monday through Saturday) ISSUED AT 255 AM CDT Sun Apr 18 2021

A strong cold front will press south across the area on Monday. Current timing suggest the central/southern CWA will see one more mild day in the 60s, while cold advection limits highs to the 50s NW of the IL River. The initial frontal passage appears mainly dry and only have slight chance pops for the far north. The front is forecast to stall over the southern CWA Monday night. This is in response to a strong mid level trof digging into the upper Midwest, and favorable upper jet dynamics developing low pressure over the southern Plains Monday night. This starts a band of frontogenesis induced precip across the northwest CWA late Monday night, slowly advancing southeast as low pressure tracks northeast along the front during the day Tuesday. While this would be a good setup for accumulating snow during the cold season, surface temperatures in the upper 30s (combined with high sun angle and warm soil temps in the 50s) over the northwest third of the CWA look too high to support accumulations during the daylight hours. If enough dynamic cooling can occur to push sfc temps down near 35F and snow rates are high enough then some accumulation on grassy/elevated surfaces would be possible. Over the eastern CWA rain is expected to change to snow during the evening, and some minor accumulations may occur here, if higher snowfall rates can occur past sunset. WPC super ensemble plumes show a large spread in accumulations, with mean values around an inch or so for the northern half of the CWA and this matched well with WPC forecasts up to 1-2" near I-74. This system will need to be monitored as the details play out.

Deep layer northwest flow behind the system will ensure well below normal temperatures through Wednesday night. This will likely result in sub-freezing lows Tuesday night and Wednesday night, and the eventual need for freeze headlines. A hard freeze (28 or colder) is possible north of I-70 Wednesday morning which would damage unprotected tender vegetation. Should see a fairly quick rebound in temperatures for Thursday and Friday, when mid level flow backs to the west ahead of the next trof building into the Plains. As this system tracks into the area rain chances increase for Friday into Saturday.

AVIATION. (For the 18Z TAFS through 18Z Monday afternoon) Issued at 1236 PM CDT Sun Apr 18 2021

VFR conditions will prevail through the entire 18z TAF period. 1730z/1230pm satellite/radar trends show scattered convection developing across east-central Illinois . mainly east of the I-55 corridor. Have included VCSH at all terminals through the afternoon accordingly. Any showers that form will dissipate shortly after sunset, followed by mostly clear skies through the night. A cold front currently poised across Minnesota into the Dakotas will drop southward on Monday. A band of mid/high clouds is expected to develop along and just behind the boundary, which will bring a VFR ceiling of around 12000ft to KPIA after 16z. Winds will initially be light/variable this afternoon as a weak trough passes through the region, then will become W/SW at less than 10kt tonight. Winds will increase and begin to veer toward the west ahead of the approaching cold front Monday morning.

ILX WATCHES/WARNINGS/ADVISORIES. NONE.

UPDATE . Barnes SYNOPSIS . Barnes SHORT TERM . 25 LONG TERM . 25 AVIATION . Barnes


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Marshall County Airport, IL10 mi72 minWNW 610.00 miMostly Cloudy61°F31°F33%1012.2 hPa
Peoria - General Downing-Peoria International Airport, IL19 mi73 minVar 510.00 miOvercast63°F31°F30%1012.4 hPa

Link to 5 minute data for KC75

Wind History from C75 (wind in knots)
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Last 24hrSW4NE3SW4SW3CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmSW3SW4W3W3
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1 day agoN3N5N6NW6N4CalmCalmCalmCalmE8E6CalmCalmCalmCalmCalmCalmE3CalmSE4CalmCalmW4NE4
2 days agoNW12
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NW6CalmCalmCalmCalmCalmCalmCalmCalmCalmCalm--N4N4N3N6N5W5NW3

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NOTE: This section has been updated as of 1/26/2021. If the image you are expecting is not showing, please let me know. You may use the EDIT function to update your location.
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