Sunday, April 20, 2008

April 21st, 2008 Forecast

With one of the better temperature busts underway in Philadelphia today (temperatures in Philadelphia were in the mid to upper 70's for a time around midday) we definitely bought a reprieve from the cold and damp regime promised by many (myself included) for Sunday and Monday.

Why? A couple of reasons stand out. One is the lack of progression from the upper level low. The low was blocked in place by increasingly strong high pressure that nosed down from Southeast Canada. The low ended up stalling out over Central Pennsylvania and has provided them significant rainfall today while we have seen scattered showers and thunderstorms this afternoon but have also seen sunshine. The extra sunshine during the early part of the day today helped boost temperatures and give us additional warmth.

Tonight we should see cloudy to mostly cloudy skies across the region as the upper level pivots to our southeast. Some showers are possible but the best chances for rainfall will be over Central PA. Temperatures tonight should drop between 47 and 53, with east winds continuing along at 10 to 15 mph.

The upper level low moves through the Delmarva and Virginia Capes on Monday bringing a chance of showers to the southern half of the region including Philadelphia. Points north of the city look to be dry but the entire region should be mostly cloudy. Temperatures will be around 60 at the Shore, and in the 62-66 range for everyone else, warmest along I-95 and points west. East winds will continue at 10 to 20 mph.

Temperatures will warm up on Tuesday to near 70 and into the mid 70's on Wednesday with increasing amounts of sunshine each day and winds eventually moving around to the southwest. Temperatures will be in the 70's through Friday before a cold front clears the coast on Saturday, bringing a pretty good chance for showers and storms.