Marine Weather and Tide Forecast for Oakbrook, KY

NEAR TERM /UNTIL 6 AM THIS MORNING/
Radiative cooling processes are in full swing as temperatures quickly dropped after sunset. Tweaked temperature grids slightly to account for quick drop, but the overall message remains the same. Patchy frost will be possible throughout much of the CWA, with the highest likelihood in central and southeastern Ohio where advisory is. Additionally, patchy fog is expected, particularly in low lying areas. Clear skies remain in place overnight, allowing for good aurora viewing conditions.

Previous discussion--> Surface high pressure will drift slowly southeast across the upper Ohio Valley tonight. With clear skies and light winds, we will see yet another night of good radiational cooling. This will allow for temperatures to fall into the mid to upper 30s (with a few lower 30s possible) across our eastern areas and the lower 40s across our west. Have issued a frost advisory across much of our east and will buffer that with an SPS for patchy frost.

SHORT TERM /6 AM THIS MORNING THROUGH 6 AM SATURDAY/
The surface high will push off to the southeast Friday into Friday night as a cold front approaches from the northwest. The airmass will remain quite dry through the day on Friday, leading to another sunny day. We should then at least begin to see some increase in high level moisture from the northwest ahead of the frontal system Friday night. Temperatures on Friday will moderate a bit with afternoon highs in the low to mid 70s. A tightening pressure gradient should help keep winds up a bit more Friday night, with overnight lows ranging from the mid 40s southeast to the mid 50s northwest.

LONG TERM /SATURDAY THROUGH THURSDAY/
Unsettled weather is expected for the first part of the long term. A developing cold front will be the focus for showers and a few thunderstorms that will mainly affect northern locations on Saturday. More showers and storms along with gusty winds will be possible on Sunday as a deepening upper trough pushes the cold front south. Additional showers may occur on Monday as a short wave rounds the base of the upper trough. Dry weather is likely to return for Tuesday through Thursday when high pressure is forecast to push in from the west.

Temperatures will show notable variation with respect to the frontal passage. Above normal highs in the 70s to around 80 Saturday and Sunday will plummet to the 50s to around 60 Monday through Wednesday before rebounding into the 60s on Thursday.
Morning lows in the 30s Tuesday through Thursday will allow frost formation.

AVIATION /06Z FRIDAY THROUGH TUESDAY/
Through sunrise, the center of surface high pressure will remain near eastern Ohio. Clear skies are forecast. Winds will be calm in the east, and southeast around 5 knots in the west.
Some river fog at KLUK may result in predominate MVFR visibilities with a brief TEMPO period of IFR visibilities possible.

For today, the center of the surface high will move off to the southeast. Diurnal mixing and an uptick in the pressure gradient will result in south/southwest winds sustained between 5 and 10 knots beginning around 15Z.

For tonight, as the high continues to move southeast, a cold front will begin to sag southward into the southern Great Lakes.
Some mid and high level clouds will spill in from the northwest in association with this frontal boundary. Winds will generally remain from the south/southwest sustained between 5 and 10 knots.

OUTLOOK...Showers and gusty winds possible Sunday.

ILN WATCHES/WARNINGS/ADVISORIES
OH...Frost Advisory until 9 AM EDT this morning for OHZ045-046- 054>056-063>065-073-074-080-082.
KY...None.
IN...None.