Area Forecast Discussion
Issued by NWS Jackson, KY

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773 FXUS63 KJKL 242045 AFDJKL AREA FORECAST DISCUSSION National Weather Service Jackson KY 445 PM EDT Mon Oct 24 2016 .SHORT TERM...
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(This evening through Tuesday night) Issued at 445 PM EDT MON OCT 24 2016 19z sfc analysis shows a dry and mostly cloud free cold front settling through eastern parts of the state. This boundary is switching winds more completely to the north at 10 to 15 kts. Plenty of sunshine on either side of the front has led to near normal temperatures in the mid to upper 60s north to the mild lower 70s south while dewpoints were able to mix down into the upper 30s and lower 40s this afternoon. The models are in good agreement aloft through the short term as they all depict a broad trough lifting northeast and out of the area. This will allow heights to rise for Kentucky through Wednesday morning while energy and the next developing trough over the plains stay well north of the area. Accordingly, will favor the blended model solution with a lean toward the higher resolution HRRR and NAM12 versions along with the co-op MOS guidance. Sensible weather will feature a clear and cool night, especially after the post frontal winds die off. This will lead to a minor ridge to valley temperature difference tonight and a more significant one on Tuesday night as the sfc high shifts off to the east. This will allow for some patchy frost to develop in isolated spots of the deepest valleys both nights, though limited by the dry air expected Tuesday night. As such, the vast majority of the area of will stay frost free for another week. Additionally, both nights could see some patchy fog along the rivers towards dawn. Another pleasant and mostly sunny day can be expected for Tuesday with highs similar to today - warmest southwest and 5 to 10 degrees cooler northeast. Started with the CONSShort/ShortBlend for the bulk of the grids with adjustments to the night-time temps revolving around terrain differences, as well as knocking dewpoints down in the afternoon and again Tuesday night. PoPs were again zeroed out through the period - in line with all guidance. .LONG TERM...(Wednesday through Monday) Issued at 325 PM EDT MON OCT 24 2016 The extended period will feature a series of shortwaves embedded in the northern stream moving through the Ohio Valley. The first shortwave will make its way from the central plains across the Great Lakes late Wednesday night/Thursday, dragging a cold frontal boundary through Eastern Kentucky. This system will bring our next chance for precipitation by dawn on Thursday. However, operational models have continued to back off on the QPF potential with this frontal passage so most locations will only see a tenth of an inch or less. The upper level pattern becomes a bit messy beyond Friday with several additional impulses dropping through the Ohio Valley in west- northwest flow. Differences exist between the GFS and ECMWF with how far south and how strong these impulses become so have remained close to the CR Superblend solution from Saturday forward. That being said, there is the potential for a few showers Saturday afternoon and evening and again late Sunday night. Ridging builds back into the Tennessee Valley on Monday setting the stage for a few more days of dry and mild weather. Temperatures will remain near seasonable values through the period with highs in the upper 60s and low 70s. Morning lows will vary a bit more with potential cloud cover and passing showers. But most mornings, lows should be near climatology, in the mid and upper 40s.
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&& .AVIATION...(For the 18Z TAFS through 18Z Tuesday afternoon) ISSUED AT 230 PM EDT MON OCT 24 2016 Aside from some scattered clouds with the front at 3-4k feet, VFR conditions will continue through Tuesday afternoon. Winds will be up between 5 and 10 kts through this fropa with a turn more northerly. Look for the winds to subside to light and variable after 23z and pick up again from the north on Tuesday at around 5 kts. && .JKL WATCHES/WARNINGS/ADVISORIES... NONE. && $$ SHORT TERM...GREIF LONG TERM...JVM AVIATION...GREIF is the U.S. government's official web portal to all federal, state and local government web resources and services.