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

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000 FXUS64 KMRX 061641 AFDMRX Area Forecast Discussion National Weather Service Morristown TN Issued by National Weather Service Huntsville AL 1141 AM EST Tue Dec 6 2016 .DISCUSSION... Late morning update includes adding isolated thunder chances for areas mainly near/north of the I-40 corridor as cluster of showers and embedded thunderstorms approach from the southwest. Strong storms are not expected, but with a strong wind field aloft, gusty winds could accompany the heavier showers and/or storms. SPC 0-3km storm relative helicity values ranged over indicated over 500 m/s values. Thankfully overall instabilities, especially surface based remain nil. Also am concerned about potentially excessive rainfall, especially over and near recent burn scar areas. Rainfall amounts downstream of those locations have been generally 1/4 to 1/2 of an inch every three hours. We`ll keep monitoring for possible flooding in those areas. && .AVIATION... Issued at 647 AM EST Tue Dec 6 2016 Strong low pressure system will be driving northeast across the region through early afternoon with very low flight conditions at CHA and TYS through mid day and moving into the TRI vicinity by mid morning and continuing into the later afternoon hours. Somewhat drier air and some downsloping westerly flow across the Cumberland Plateau should allow for improvement at those farther southwest terminals during the afternoon. TRI may not see a great deal of improvement with cold air advection filling in behind the system this evening. Would expect an mvfr ceiling to eventually develop at each terminal tonight with a decent amount of low level moisture filtering in from the northwest. && .MRX WATCHES/WARNINGS/ADVISORIES... NC...None. TN...Wind Advisory until 4 PM EST this afternoon for Blount Smoky Mountains-Cocke Smoky Mountains-Johnson-Sevier Smoky Mountains-Southeast Carter-Southeast Greene-Southeast Monroe-Unicoi. Flash Flood Watch until 4 PM EST this afternoon for North Sevier- Sevier Smoky Mountains. VA...None. && $$

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