Mountain Area Forecast ( Sept 4-6 )
Overnight Into Sunday Morning
Mostly clear. Cool. Areas of valley fog. Light winds. Temperatures varying from 40s in cooler mountain valleys of mid-upper elevations to the lower-middle 50s.
Sunday Afternoon
Partly-mostly sunny. Light N-NE winds mostly less than 10 mph. Temperatures varying from 60s at highest elevations to the upper 70s to lower 80s ( warmer in the Great Valley toward the Tri-Cities ).
Sunday Night Into Monday Morning
Mostly clear. Areas of valley fog. Light winds. Temperatures varying from upper 40s to lower 50s in cooler mountain valleys to the upper 50s to lower 60s.
Monday Afternoon
Partly-mostly sunny. Warmer. Winds NW-N generally less than 10 mph. Temperatures varying from low-mid 70s in upper elevations to the lower-middle 80s ( hotter south into the Great Valley of eastern Tennessee ).
Monday Night Into Tuesday Morning
Partly cloudy. Areas of valley fog. Winds WNW-NW at 5-10 mph along mid-upper elevation mountain ridges. Temps varying from 50s in cooler valleys to the mid-upper 60s.
Tuesday Afternoon
Partly cloudy. Winds WNW-NW 5-10 mph. Temps varying from 70s in upper elevations to the mid-upper 80s ( hotter south into the Great Valley toward the Tri-Cities ).
Late Summer-early Meteorological Autumn heat wave conditions are expected through mid-late week amid a subsidence regime of sinking air in the wake of western Atlantic tropical activity. Due to sinking air I have updated the forecast to reduce humidity, this will allow for significant day-to-night temperature spreads ( most pronounced amid mountain valleys ) and make heat tolerable until humidity increases along an initial front by next weekend into the middle of September ( current trend ).
Weather Discussion ( Summer Returns )
A welcomed and refreshing break from the muggy days of August is being enjoyed during this Labor Day Holiday.
Temperatures have been in the 40s amid higher mountain valleys with 50s widespread across lower-middle elevations. Very nice!
A heavy dew has occurred in valleys as the air is approaching saturation in lower elevation mountain valleys at 3:30 AM.
However, as I advertised last week, sinking air in the wake of Hermine will help rebuild a large upper ridge over the region with rising temperatures and late summer-early Meteorological Autumn heat wave conditions expected to redevelop during this week.
The 51-Member European Ensemble MEAN shows this well with above to much above average temperatures expected during the Tuesday-Saturday period ( September 6-10 ).
There is little doubt that this will be sufficient to allow the Tri-Cities to break the all-time record for the most 90s in a year ( or summer season ), especially given the continuation of dry ground versus average over the Great Valley.
