Partly to mostly clear. Areas of dense valley fog. Light winds. Large vertical temperature spread developing between cooler valleys and milder ridges & plateaus. Temperatures varying from upper 40s to lower 50s in cooler mountain valleys to the lower-middle 60s.
Friday Afternoon
Partly to mostly sunny. Warm. Light NE-ENE winds. Small chance of an isolated shower or sprinkle. Temps varying from upper 60s to lower 70s in the upper elevations to upper 70s to lower 80s ( warmer into the Great Valley ).
Friday Night Into Saturday Morning
Partly-mostly clear ( some high clouds possible ). Areas of dense valley fog. Light winds. Large vertical temperature spread developing between cooler mountain valleys and milder ridges & plateaus. Temperatures varying from the 40s in colder mountain valleys to the lower-middle 60s.
Saturday Afternoon
Mostly sunny. Unseasonably warm. Light NNE-NE winds. Temperatures varying from lower to middle 70s in upper elevations to the low-mid 80s.
Saturday Night Into Sunday Morning
Clear. Areas of dense valley fog. Large vertical temp spread developing between colder valleys & milder ridges-plateaus. Temperatures varying from low-mid 40s in colder valleys to the middle 50s to around 60 degrees. Light SE-SSE winds generally less than 10 mph on mid-upper elevation ridges.
Sunday Afternoon
Mostly sunny ( some high clouds possible ). Unseasonably warm. Light easterly winds. Temperatures varying from low-mid 70s in upper elevations to upper 70s to lower 80s. Around 70 degrees at highest elevations.
Sunday Night Into Monday Morning
Mostly clear. Areas of dense valley fog. Large vertical temp spread developing between colder valleys and milder ridges and plateaus. Temperatures varying from 40s in the colder valleys to the mid 50s to around 60 degrees.
A major weather pattern change featuring a shift to below average temperatures is being monitored for the last days of September into early October. Chilly conditions are currently expected for the High Knob Naturalist Rally on September 30.
High Knob Naturalist Rally – September 30 at High Knob Lake Recreation Area
Weather Discussion ( Change In Sight )
Reference My Updated Weather Trend for the upcoming High Knob Naturalist Rally, and the Hellbender-Cloudsplitter races, to look at a major pattern change across North America.
Saturday Morning Update
NASA Visible Image At 8:30 AM – September 23, 2017
The view this Saturday morning features a rather typical scene with an array of dense valley fog marking the Clinch, Cumberland, New, Russell Fork-Levisa Fork-Tug Fork of the Big Sandy and many more streams beneath an array of scattered high altitude clouds.
A large sunrise temperature spread from upper 40s to lower 50s in cooler mountain valleys to the lower-middle 60s on exposed ridges and plateaus will kick start an unseasonably warm Saturday for the first full day of astronomical autumn.
Have a great day.
Previous Discussion
High Knob Massif Webcam – University Of Virginia’s College At Wise
The current weather pattern is the epitome of persistence, with mostly clear skies by night that feature large vertical temperature spreads between colder mountain valleys and milder ridges-plateaus, along with an array of dense valley fog, followed by building day-time clouds and localized to very widely scattered showers and sprinkles.
High Knob Massif Webcam – University Of Virginia’s College At Wise
The only real changes through this weekend into early next week will be for some drying of the vertical column to help enhance diurnal temperature spreads. That translates into a continuation of unseasonably warm conditions by day and cool temperatures by night ( especially amid middle-upper elevation mountain valleys where down right chilly temps will continue to be felt ).
European Model 500 MB Height Anomalies Forecast – 8 AM Saturday ( Sept 30 )
The European Model, and its ensembles, remain very steady in forecasting a significant ( major versus this current air mass ) cooling trend across much of eastern North America by later next week into next weekend. Just in time for the 11th Annual High Knob Naturalist Rally.
If the axis of the 500 MB trough is actually still back west of the mountains, as forecast above, this could also mean unsettled or wet conditions; however, it is too soon yet to know.
European Model 850 MB Temp Anomalies Forecast – 8 AM Saturday ( Sept 30 )
Due to changes ongoing at high latitudes a forecast cooling seems increasingly likely, with the 0 degree Celsius line at 850 MB dropping down across New England and much of the Great Lakes by next weekend. Changes, of course, will occur in these details, but the trend is looking strong for a major flip in the pattern across eastern North America.
