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

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000 FXUS64 KMRX 201909 AFDMRX Area Forecast Discussion National Weather Service Morristown TN 309 PM EDT Tue Jun 20 2017 .SHORT TERM (Tonight and tomorrow)...
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An upper level trough will continue to move east across the Great Lakes through Wednesday afternoon. At the same time...Tropical Storm Cindy will move towards the western Gulf Coast. A boundary between the two systems currently set up SE of TN will move northward toward the southern TN Valley and SW NC through Wednesday afternoon. Tonight...mostly clear skies expected...with clouds expected to increase in the southern Valley and SW NC through the night in response to the boundary moving northwards. Wednesday...flow north of the boundary will be from the west and northwest...while flow south of the boundary will be from the southwest. Can expect this boundary to be the trigger for a few showers...with very little movement expected in the showers. Have left in slight chance along the southern Plateau...southern Valley, and SW NC where this boundary will cause the greatest chance for light rainfall accumulations through Wednesday afternoon. Temperatures will be near normal tonight and Wednesday afternoon. .LONG TERM...(Wednesday night through Tuesday)... Old frontal boundary just to the south of the Forecast area will have added convective activity early Wednesday evening and will be dissipating. Tropical moisture from Cindy will be streaming north to into the extreme southern part of the region. Will continue low rain chances Wednesday night. The main push northward of tropical moisture will be Thursday with deteriorating conditions spreading north during the day as the very outer moisture bands spread north into the Tennessee Valley. Some heavier rainfall amounts are possible Thursday afternoon and evening especially southern areas. Amounts of around 1 inch possible. More rainfall Friday with the highest amounts expected Saturday as the tropical system shifts east into the eastern Tennessee ahead of a cold front. This period of rainfall may cause some flooding. The chance of rain will continue Sunday as the front only slowly moves eastward. Monday rainfall ends as the front will move to the southeast. Temperatures will be cooler due to clouds and rain. Monday and Tuesday highs will be mainly in the 70s behind the front. Lows will be much cooler Monday night as well in the mid 50s to lower 60s.
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Chattanooga Airport, TN 68 85 70 82 / 10 20 30 70 Knoxville McGhee Tyson Airport, TN 66 85 68 82 / 10 10 10 50 Oak Ridge, TN 65 87 68 82 / 10 10 10 50 Tri Cities Airport, TN 61 84 64 81 / 10 10 10 40
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