Friday, September17, 2021
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Marine Weather and Tides
Jacksonville, IL

Version 3.4
NOTICE
3/30/2021 -- ANZ330 has been split into ANZ331 and ANZ332. Click EDIT in Marine Forecast and select your new zone.
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 6:43AMSunset 7:07PM Friday September 17, 2021 10:36 AM CDT (15:36 UTC) Moonrise 4:52PMMoonset 1:47AM Illumination 84% Phase: Waxing Gibbous; Moon at 11 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 Jacksonville, IL
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location: 39.73, -90.23     debug


Area Discussion for - Central Illinois, IL
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FXUS63 KILX 171446 AFDILX

Area Forecast Discussion National Weather Service Lincoln IL Issued by National Weather Service Chicago IL 946 AM CDT Fri Sep 17 2021

SYNOPSIS. Issued at 244 AM CDT Fri Sep 17 2021

An isolated shower or storm is possible across northern and southern IL this afternoon and evening, but most of central IL will remain dry. More summerlike temperatures are on tap, as highs reach the middle to upper 80s.

UPDATE. Issued at 946 AM CDT Fri Sep 17 2021

The forecast is in excellent shape.

Regional satellite and radar imagery depict a narrow zone of showers and a few thunderstorms drifting northward into the southern tip of Illinois along the nose of a plume of low-level tropical moisture. As low-level flow becomes easterly across southern Illinois along the northern flank of a weak tropical low pressure system centered along the Arkansas and Louisiana borders, the northern boundary of the low-level moisture will more or less remain in place across far southern Illinois. Accordingly, the expectation is that the showery activity entering southern Illinois will remain south of our area, outside of a small (<20%) chance an isolated shower attempts to develop in Clay, Richland, or Lawrence counties this afternoon. The other area to watch for a few showers and few thunderstorms will be along and north of a line from Avon to Chenoa this evening behind a weakening cold front that currently stretches from central Wisconsin to northern Kansas, though coverage will be scattered at best owing to meager instability. Hence, much of central Illinois should stay dry today. Otherwise, highs in the upper 80s and light winds look on track.

Updated products will be sent shortly.

Borchardt

SHORT TERM. (Today and tonight) ISSUED AT 244 AM CDT Fri Sep 17 2021

Another quiet weather night across central IL with high pressure off the east coast and a cold front located over the upper Midwest. Under clear skies and light winds, 2 am temperatures were a few degrees warmer than recent nights, in the upper 50s to mid 60s.

Shortwave tracking across the Great Lakes today will push a cold front southeast into northern IL by afternoon and into the northern CWA this evening. Forecast soundings stay fairly dry and with limited instability feel only an isolated shower or storm possible mainly northwest of the IL River and have slight chance pops to cover this. The other area that could see an isolated afternoon to evening shower/storm is south of I-70 where a surge of deeper moisture from the south overlaps a subtle surface trof. Again, slight chance pops warranted here. Overall most areas to remain dry. Southwest flow ahead of the front will tap into thermal ridging (+18C at 850 mb), sending highs to the mid/upper 80s. Mid/upper 60s dewpoints will result in peak heat indices around 90F. Front looks to dissipate over the area tonight, leaving dry weather and lows in the mid 60s.

LONG TERM. (Saturday through Thursday) ISSUED AT 244 AM CDT Fri Sep 17 2021

1025 mb high pressure builds across the Great Lakes on Saturday, and resulting northeast winds will keeps highs in the mid 80s. The high pushes off to the east Sunday and with southeast flow highs should get back to the upper 80s. Most areas to remain dry through the weekend as upper ridging builds, though a few showers or storms may approach the far southern CWA in close proximity to a moisture-rich sub-tropical airmass. Better chances for isolated to scattered storms will overspread the CWA on Monday when the upper ridge shifts east and southwest mid level flow develops. Higher PWs forecast at 1.8-2" east of I-55 will bring higher rain chances to the eastern CWA.

Latest deterministic guidance has honed in on a less amplified/more progressive upper trof swinging through the Midwest Monday night and Tuesday. With a moist airmass in place and forcing for ascent with the cold frontal passage, widespread showers and storms are likely. This would be welcome rain for much of the area, the latest Drought Monitor shows abnormally dry conditions expanding across central/SE IL. All solutions point to a quicker frontal passage, so have a sped up the drying trend for Tuesday night. Behind this front, a dry fall airmass looks to set up across the Midwest for Wednesday through Friday. Highs in the 70s and lows in the 50s would be near to slightly below normal.

AVIATION. (For the 12Z TAFS through 12Z Saturday morning) Issued at 522 AM CDT Fri Sep 17 2021

VFR conditions continue to dominate. A weak cold front will move in from the northwest this evening, possibly producing a few showers near KPIA. Ahead of the front southwest winds at 5-8 kt will prevail late morning through afternoon. The front will wash out over the area leaving light winds in place which will eventually veer northeast after midnight.

ILX WATCHES/WARNINGS/ADVISORIES. NONE.

UPDATE . WFO ILX SYNOPSIS . 25 SHORT TERM . 25 LONG TERM . 25 AVIATION . 25


Weather Reporting Stations
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Airport Reports
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AirportDistAgeWind ktVisibilitySky/WeatherTempDewPtHumidityPressure
Jacksonville Municipal Airport, IL3 mi41 minN 010.00 miFair78°F67°F69%1020 hPa

Link to 5 minute data for KIJX

Wind History from IJX (wind in knots)
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Last 24hrSE7S7E6E7
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1 day agoCalmCalmCalmN6N7CalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmCalmS7
2 days agoSW13
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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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