From BTV discussion:
https://forecast.weather.gov/product.php?site=BTV&issuedby=BTV&product=AFD&format=CI&version=1&glossary=1
AR TERM /THROUGH TUESDAY/...
As of 707 AM EDT Monday...Forecast is on track for high clouds
overspreading the forecast area throughout the day, potentially
with mid-level, thicker clouds arriving shortly behind. It will
be a close one in regards to eclipse viewing. What we know:
Highest sky cover appears to be in northern New York counties
while lowest sky cover (clearer skies) will be in the Northeast
Kingdom. There`s the potential for the clouds to slow as they
approach and run up against the ridge, leaving more time for
clearer viewing this afternoon. Also, fog is not going to
materialize at all this morning. Previous discussion below:
Previous discussion...
Unfortunately, model guidance continues to inch the sheet of high
clouds faster as it progresses southwest to northeast across the
forecast area.
Based on the current speed of the high clouds that are currently
across western New York/Pennsylvania, these will arrive around 12-4
PM, depending on your location across the forecast area. The
Northeast Kingdom, being farthest northeast in our forecast
area, looks most likely to be the clearest spot at 2 PM today.
Even with more sky cover than hoped, we are anticipating an
unseasonably warm day today with highs in the mid- to upper 50s
in the mountains to lower 60s for the wider valleys, and winds
will be somewhat light out of the west/northwest. We`ll likely
have a 4-6 degree drop during totality, which could limit
temperatures getting higher than the low 60s despite 925mb
temperatures potentially in the 6-8 C range.