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

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000 FXUS64 KMRX 251919 AFDMRX Area Forecast Discussion National Weather Service Morristown TN 319 PM EDT Thu May 25 2017 .SHORT TERM /Tonight and Friday/...
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An upper-level low pressure system centered across eastern Kentucky will slowly depart the this evening and overnight. A shortwave trough associated with this feature has brought some widespread cloud cover to the central Valley and points north and east, along with a broad area of light rain showers. This cool, NW flow and the clouds/precipitation will keep temperatures peaking in the upper 50s to lower 60s this afternoon. Elsewhere to the south, breaks will allow highs to peak in the low to mid 70s. This NW flow and cloud cover to the north will linger overnight, resulting in some gusty winds along the Blue Ridge and Cumberland Mtns along the KY/VA and TN/NC border across upper east Tennessee. However, precipitation should generally wane late this evening to around midnight. Clouds will quickly break up by late tonight into early Friday morning as high pressure and drier air builds into the region. A wind shift to the south and ample sunshine will allow highs to climb back into the 80s areawide -- allowing the soils to begin to dry out a bit. .LONG TERM /Friday Night through Thursday/... Will be in an active weather pattern throughout the extended. Friday night into Saturday...flow aloft becomes zonal with a couple of weak short waves tracking along the upper flow. Could see isolated convection develop over northern locations late Friday night with the initial weak wave. Saturday...with diurnal heating and increased low level moisture...the air mass will destabilize. With another wave moving in...expect scattered thunderstorms to form over the region. A few storms may become strong to marginally severe for Saturday afternoon and evening. A frontal boundary will then move in and become the main weather feature for Sunday and Monday. The atmosphere will remain unstable and with the added energy from an 850MB jet and stronger lift from the boundary...expect widespread organized convection for Sunday afternoon. A few storms may become strong to severe. The boundary will remain in the vicinity on Monday and additional scattered convection is expected. Flow along again become zonal from Tuesday through Thursday and expect isolated to scattered convection each day.
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&& .PRELIMINARY POINT TEMPS/POPS...
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Chattanooga Airport, TN 55 85 66 86 / 0 10 10 30 Knoxville McGhee Tyson Airport, TN 55 82 65 84 / 10 10 10 30 Oak Ridge, TN 54 83 65 84 / 10 10 10 30 Tri Cities Airport, TN 52 77 61 82 / 30 10 20 40
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&& .MRX WATCHES/WARNINGS/ADVISORIES... NC...None. TN...None. VA...None. && $$ AMP/MJB

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