The atmosphere is very moist and unstable, so showers and storms are very likely to develop--some of which may be strong. I'll post if watches/warnings are issued. Heavy rains are the most likely threat, but strong winds and hail will affect some areas as well. Timeframe is anytime after about 3pm (lasting on and off) into the overnight hours. The weekend, by the way, will be GREAT both days. Low humidity, comfortable temps...
We are no longer alone in the world of weather blogging.
Gothamist.com, serving the NYC area, has a
weather blog which is quite good.