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

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389 FXUS64 KMRX 270715 AFDMRX Area Forecast Discussion National Weather Service Morristown TN 315 AM EDT Tue Jun 27 2017 .SHORT TERM (Today and Tonight)...A weak short-wave will move quickly across the Tennessee Valley this morning/early afternoon. Moisture is limited with PWs generally less than 1 inch. Also, instability is very limited. Will include sprinkles area-wide for this morning, but feel chances of measurable rain is limited. After wave passes early this afternoon, clouds will dissipate giving way to clear sky this evening. For tonight, clear sky and calm winds. Steam fog develop is expected near area lakes and streams. .LONG TERM...(Wednesday through Monday)...Surface high pressure shifts off the Atlantic Coast early in the extended period, opening up our forecast area to more moist air flowing in from the Gulf. By Thursday afternoon, enough moisture and instability will be overhead to trigger some scattered afternoon convection across the southern Tennessee Valley. With continued moisture flow, more coverage of showers and thunderstorms are expected Friday afternoon. For the upcoming weekend, a weak cold front will approach the forecast area. This front will stall out across the Ohio Valley for the weekend and a weak shortwave will ripple along the frontal boundary, bringing a continued chance for showers and thunderstorms through the weekend. The stalled front to our north will continue to help channel moist, unstable air into the MRX forecast area for early next week, resulting in chance-slight chance scattered showers and thunderstorms again on Monday afternoon. Temperatures will be near normal for the extended forecast period, with highs in the 80s and overnight lows in the 60s. && .PRELIMINARY POINT TEMPS/POPS... Chattanooga Airport, TN 83 61 87 67 / 10 0 0 10 Knoxville McGhee Tyson Airport, TN 79 57 84 65 / 10 0 0 0 Oak Ridge, TN 81 56 85 64 / 10 0 0 0 Tri Cities Airport, TN 78 51 81 60 / 10 0 0 0 && .MRX WATCHES/WARNINGS/ADVISORIES... NC...None. TN...None. VA...None. && $$

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