Thursday Night: Rain. Low around 40. East wind between 7 and 9 mph. Chance of precipitation is 80%. New rainfall amounts between a quarter and half of an inch possible.
Friday: Rain likely before 11am, then areas of drizzle. Cloudy, with a high near 48. Chance of precipitation is 60%. New rainfall amounts of less than a tenth of an inch possible.
Friday Night: Areas of drizzle before 11pm, then a chance of showers after 11pm. Cloudy, with a low around 40. Chance of precipitation is 50%.
Saturday: A chance of showers. Cloudy, with a high near 51. Chance of precipitation is 50%.
That is the forecast for 2500' in West Dover at Mt Snow. That amount of rain and 2 days of warmth will do wonders to screw up a snowpack and make it nearly worthless for an opening weekend of skiing.
Add to that overnight lows of just 25 degrees the next 2 nights at Mt Snow at 2500' elevation with 80% humidity, and you're looking at marginal snowmaking conditions.