Saturday is clearly the pick day due to uncertainties as to when the Sunday morning disturbance leaves us. Synoptic features are dominated by two fairly strong closed lows in Canada, a western one on the Alberta-Saskatchewan border, and one just east of Hudson's bay...and a much weaker albeit not insignificant one on the NY-Pennsylvania border. Sandwiched in between the strong lows is a weak ridge....and that is the problem. Saturday will be a fine spring day, but the weakness of the ridge may allow cirrus in the afternoon. Both GFS and NGM have rain Saturday night and Sunday morning for the southern tier; if that happens and when it clears out is still uncertain...could linger and ruin the flying day, or scoot out and make for a decent day. Much depends on how the strong eastern low moves...both models have it moving SSE (instead of the more usual and more preferable NE), and if it gets too close it will cause trouble.
Saturday: six pack for flights > 2.5 hours.
Sunday: six pack for flights > 1.5 hours.