Area Forecast Discussion
Issued by NWS Jackson, KY

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000 FXUS63 KJKL 200357 AFDJKL AREA FORECAST DISCUSSION National Weather Service Jackson KY 1057 PM EST Sun Nov 19 2017 .UPDATE...
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Issued at 1057 PM EST SUN NOV 19 2017 Other than a few patches of low stratus near the Virginia border, clear skies have taken hold. May see a few cirrus make it in from the northwest later tonight, but temperatures will continue to steadily drop into the low-mid 20s. UPDATE Issued at 646 PM EST SUN NOV 19 2017 Low stratus slowly scouring out across eastern Kentucky. Will see this trend continue this evening into tonight downstream of high pressure building in from the lower to mid Mississippi Valley. Will monitor valley temperatures through the evening as clouds push east and winds further diminish.
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&& .SHORT TERM...(This evening through Monday night) Issued at 344 PM EST SUN NOV 19 2017 A shortwave moving across the Ohio Valley this morning is currently exiting to the east this afternoon. This has impacted the CWA, keeping moisture in the form of low clouds across the region as well as some sprinkles (and flurries in the highest terrain) throughout the morning and early afternoon. As this shortwave continues to shift eastward, expect these sprinkles/flurries to taper off over the next few hours. Latest satellite imagery shows the back edge of the llvl clouds now over central Kentucky nudging towards our CWA. Expect clouds to begin clearing out late this afternoon and into the evening from west to east. As we head into the overnight, an area of surface high pressure will begin nosing in from the SW, and should be located across the CWA by 12Z Monday. Winds will turn more SW as the system approaches, then remain S to SW through the day Monday and into Monday night as it slowly shifts eastward. Made adjustments to the valley winds and temps, lowering them based on the decoupling that is likely to take place with high pressure overhead, especially Monday night under the more southerly flow. Meanwhile, southerly flow will help to boost temps on Monday afternoon back to around 50 degrees in most locations. Latest soundings show a very dry airmass in place across the region with the incoming high, so expect mostly clear skies throughout the remainder of the short term forecast period after clearing clouds this evening. While a few patches of fog can`t be ruled out in the most sheltered valleys, the overall likelihood of fog is fairly low based on how dry the latest soundings are, therefore kept out of forecast. .LONG TERM...(Tuesday through Sunday) Issued at 344 PM EST SUN NOV 19 2017 The period will be dominated by a general longwave trough over the eastern CONUS, and periodic impulses rotating through to affect the trough`s amplitude and position. At the surface, these impulses are expected to support a cold front moving through our area Tuesday night, another cold front which dies as it approaches the Ohio Valley Thursday night, and a strong cold front expected to pass through our area next weekend. No significant moisture return is forecast ahead of the fronts. In the 12Z model runs, the GFS does generate light precip over our northeast counties on Saturday, and its ensemble mean shows light precip over our area on Saturday into Saturday evening. Have allowed for a slight chance of showers over our northeast counties in those periods, with that being the only mention of precip during the long term period. For temps, a couple of brief mild spells are forecast in the warm air advection immediately ahead of the cold fronts. Otherwise, readings are expected to be near or below normal. && .AVIATION...(For the 00Z TAFS through 00Z Monday evening) ISSUED AT 646 PM EST SUN NOV 19 2017 Borderline VFR/MVFR ceilings still plaguing portions of the eastern Kentucky airspace early this evening, but solid VFR conditions will return by mid evening as low stratus pushes east. High pressure building in from the lower-mid Mississippi Valley will keep any cloud cover confined to a few cirrus late this evening through Monday afternoon as winds back southwesterly to southerly at generally 5 knots or less. && .JKL WATCHES/WARNINGS/ADVISORIES... NONE. && $$ UPDATE...GUSEMAN SHORT TERM...JMW LONG TERM...HAL AVIATION...GUSEMAN is the U.S. government's official web portal to all federal, state and local government web resources and services.