This post-Memorial Day weather stinks! Yesterday's high of 61 degrees was 15 degrees below normal, and WCBS 2 reports, "Friday will be a changeable day. There could be some rain in the morning, then possibly some sun will poke through the clouds during the afternoon. The more sun we see, the better chance for strong thunderstorms later in the day as a cold front approaches the area." Yes, more sun=more thunderstorm possibility! WCBS 2 meteorologist Mike Latella explains, "Add sunshine to an unstable atmosphere and an approaching cold front. That is the recipe for thunderstorms." Today's weather will vary—low to mid 70s in the city but in the 60s along the coast. But keep the faith: Saturday will be sunny, with highs in the upper 70s (there is a small threat of a shower late in the afternoon or evening) while Sunday will be partly cloudy, highs in the mid 70s. Photo of Tibor Kalman's Sky Umbrella, available at the MoMA