Area Forecast Discussion
Issued by NWS Jackson, KY

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475 FXUS63 KJKL 271856 AFDJKL AREA FORECAST DISCUSSION National Weather Service Jackson KY 256 PM EDT Tue Jun 27 2017 .SHORT TERM...
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(This evening through Wednesday night) Issued at 256 PM EDT TUE JUN 27 2017 Surface high pressure will move across our area tonight and then off to our east tomorrow. Afternoon cu field will diminish by around sunset leaving clear skies and calm winds overnight. These nearly perfect radiational cooling conditions will enable temps to plummet into the upper 40s to low 50s. Another beautiful day is in store for tomorrow with sunshine and low humidity helping boost temps back into the lower 80s. Wednesday night should again be relatively clear but southerly flow will begin to engage in response to an approaching weather system to our west. This will result in a wider temperature range across the area, with temps varying from the mid 50s in our deeper eastern valleys to the low to mid 60s elsewhere. .LONG TERM...(Wednesday night through Monday) Issued at 405 AM EDT TUE JUN 27 2017 A relatively dry air mass will still be in place at the start of the period. However, surface high pressure will be to our east, and flow around it will have advection of warm and moist air underway. With mainly clear skies, this will promote ridge/valley low temperature differences for at least the first couple of nights. The increasing moisture will eventually lead to more clouds and the possibility of precip. It begins with a slight chance of showers/thunderstorms on Thursday afternoon. Up until that point the flow aloft will be weak and zonal. An upper low dropping southeast toward the Great Lakes will cause some buckling, with the westerlies dropping southward late in the week. This allows a weakening cold front to drop to the Ohio Valley over the weekend, presenting our best chance of rain on Saturday. The upper low and trough lift out to the northeast late in the weekend, and the surface front loses momentum and definition. Even though no significant change in air mass is expected, the probability of rain will drop off with the departure of the upper level system at the start of the new week.
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&& .AVIATION...(For the 18Z TAFS through 18Z Wednesday afternoon) ISSUED AT 132 PM EDT TUE JUN 27 2017 High pressure will build over the area through the period. Scattered to briefly broken cu field this afternoon will dissipate by around sunset leaving clear skies for the remainder of the period. Fog will develop in the river valleys overnight and it may creep up to affect JKL and SJS by around dawn. Confidence in that occurring is not high enough for a mention in the TAFs, however. && .JKL WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SHORT TERM...ABE LONG TERM...HAL AVIATION...ABE is the U.S. government's official web portal to all federal, state and local government web resources and services.