I'm sure EMSC will be tempted to visit family in the Finger Lakes region. But here's the detailed weather analysis from Jay Anderson.
The overriding trend is that cloudiness gets steadily worse as the eclipse track moves from SW to NE. There are microclimate nuances which Jay discusses. For easterners the most favorable locations are along the south shores of Lakes Erie and Ontario. Rochester is an easy daytrip for EMSC's relatives. However, Rochester and Cleveland, the clearest points on the eastern part of the track, are still 60% average cloud, more than any point on the track west of the Mississippi.
East of the Champlain Valley the climate becomes even more consistently cloudy. For those wanting to ski, the climate odds are better at Whiteface than farther east.
The bottom line for anyone in the eastern part of the track is to maintain maximum flexibility and base your call on weather forecasts a day or two ahead. And maybe you should have a Southwest Airlines ticket to Austin or San Antonio as a backup plan. Liz and I expect to be in Mexico, which should come as no surprise if you read Jay's climate analysis.