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

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000 FXUS64 KMRX 100840 AFDMRX Area Forecast Discussion National Weather Service Morristown TN 340 AM EST Sun Dec 10 2017 .SHORT TERM...
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(Today and Tonight)...Surface high pressure will build in today. Any lingering low clouds northeast will quickly dissipate as the cold advection is ending. Plenty of sunshine today, then a weak short wave will brush at least northern areas with a period of mainly high/mid clouds this evening, but these clouds should pull out fairly quickly as well. MAV temps look reasonable for the most part, so just some minor tweaks. .LONG TERM...(Monday through Saturday)...It looks like about three systems impact the region in the long term with the final system at the very end of the period, bringing rain Saturday night into Sunday. Monday starts out dry and pleasant with sunshine and high temperatures near normal in the upper 40s and lower 50s. However, more chilly polar air will be moving back into the region late Monday night into Tuesday as another system drops southeast out of the Central Canadian provinces. Computer modeling is still indicating the greatest impact with snow showers will be across the northern part of the forecast area and due to the northwest flow regime associated with these systems, snow accumulation is expected mainly in the higher terrain areas. The clipper doesn`t have a great deal of moisture associated with it, so snowfall amounts in the terrain would be around an inch with trace amounts in the valleys across Southwest Virginia and Northeast Tennessee. A trailing wave keeps the chance for a few snow showers going across the northeast part of the forecast through Tuesday night before ending early Wednesday morning. Wednesday should be dry but quite cold as the northerly low level flow continues. Temperatures moderate again on Thursday but clouds will be on the increase and there could be a sprinkle across the north as more short wave energy builds southeast through the Mid Mississippi and Ohio river valleys. The resident upper trough will become amplified again over the Eastern U.S. as this feature and another, even stronger short wave and surface cold front move through the Southern Appalachian region. Once again, there will be a chance for more orographic snowfall for the higher terrain with this system, with some light rain or snow flurries in the valleys Thursday night into Friday. The offending system departs the region Friday night in time for a decent start to the weekend with some sunshine and temperatures rebounding back to normal for mid December.
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Chattanooga Airport, TN 46 31 52 36 / 0 0 0 0 Knoxville McGhee Tyson Airport, TN 42 30 51 34 / 0 0 0 10 Oak Ridge, TN 44 29 50 34 / 0 0 0 10 Tri Cities Airport, TN 39 24 47 31 / 0 0 0 10
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