Friday.
Wide spread rain and thundershowers clearing from North to South as the day progresses.
A long band of showers is headed up the Ohio valley, slowly clearing as it moves east.
Rochester Ny will be clear by the end of the morning.
Waterloo is 50 miles south east of Rochester and Watkins glen is another 40 miles south of that.
It's likely that skies will be unkind as we travel there, but look to be in good shape by track time at the Glen.
Saturday promises to be absolutely beautiful. Bring your sun tan lotion.
Here's a good weather radar map useful for anywhere in the USA
http://www.intellicast.com/Local/WxMap.aspx?location=&weather=hdRadarSmoothPaletteA