Area Forecast Discussion
Issued by NWS Knoxville/Tri Cities, TN

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000 FXUS64 KMRX 132348 AAA AFDMRX Area Forecast Discussion...UPDATED National Weather Service Morristown TN 648 PM EST Fri Jan 13 2017 .AVIATION...
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A massive ridge continues to hold off inclement winter weather across most of the Southeastern U.S. The dividing line between a much cooler airmass and a very pleasant mild early Spring-like airmass is in position along the Cumberland Plateau northeast into the Central Appalachians. To the immediate northern side of this boundary, poor ifr and even lifr flight conditions remain while south of the boundary, including cha, tys and tri; better flight weather is in place. Would expect several more hours of vfr flight weather at cha and tys; although an mvfr ceiling is certainly possible early with the frontal boundary lurking just to the northwest. Tri may have to deal with worse conditions, starting out with mvfr category and deteriorating to ifr later tonight into Saturday morning. Allowed for some saturation of lower layers at cha and tys along with some fog; mainly in an mvfr condition. The frontal boundary may push a little farther north by mid day Saturday allowing for an improvement to vfr conditions at cha and tys while tri may remain mvfr through the afternoon hours. The models try to generate a couple sprinkles across the Great Valley during the forecast period. Probability is a little too low to include at this time.
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