Mountain Area Forecast ( Sept 26-28 )
Overnight Into Monday Morning
Partly to mostly clear. Areas of river valley and lake fog. Light winds becoming SW at 10-20 mph, with higher gusts, by morning on middle to upper elevation mountain ridges. Temperatures varying from 50s in cooler mountain valleys to the mid-upper 60s.
Partly-mostly cloudy. A chance of showers-thunderstorms, then showers and thunderstorms becoming likely by late in the afternoon-early evening. More humid. Winds SW-WSW 10-20 mph, with higher gusts ( especially along mid-upper elevation mountain ridges ). Temperatures varying from upper 60s-lower 70s in upper elevations to the upper 70s to lower 80s ( warmer south into the Great Valley ).
Monday Night Into Tuesday Morning
Any evening showers ending. Turning chilly. Low clouds and dense fog at higher elevations above 2500-3000 feet. Winds becoming NNW-N at 5-10 mph, with higher gusts, on mid-upper elevation mountain ridges. Temps dropping into the 40s to lower-middle 50s ( warmer in lower elevation valleys of the Clinch, Powell, Holston river basins ).
Becoming mostly sunny. Cool. Light WNW-NW winds. Temps varying from the 50s to lower 60s in upper elevations to the upper 60s to lower 70s.
Tuesday Night Into Wednesday Morning
Partly-mostly clear. Chilly. Winds WSW-WNW at mostly less than 10 mph on mid-upper elevation mountain ridges. Temperatures varying from mid-upper 30s in colder valleys to the mid-upper 40s. Areas of valley fog, especially along major rivers-lakes. Patchy frost possible in coldest valleys.
Numerous showers & thundershowers, some with possible hail due to cold air aloft, are being monitored for mid-late week amid chilly air associated with a slow moving upper-level low pressure.