Saturday, April 21, 2012

Thunder Chances Later Today

Low clouds are ruling the roost this morning across the region as southerly breezes have pushed some low level moisture in advance of a cool front that is out over Western Pennsylvania.  That front is relatively slow moving and will take the day to cross the entirety of Pennsylvania.   Our low clouds will gradually lift into a mix of clouds and sunshine, especially east of the city, for the lion's share of the day.  However, west of 95 will probably see less sunshine on the whole as clouds in advance of the front approach the region.

Showers and storms will gradually push east through the state today -- with Central Pennsylvania seeing its chances of thunder increase after 3 PM, the city getting in on the fun after 5 or 6 PM.  While severe weather does not look likely today, there could be a few stronger storms that bring gusty winds to any one location...the best chances of these could be across the western suburbs into Lancaster County based on radar projections from the NAM.   The front will slow further as it crosses the region, getting to the coastline  tonight before stalling out...which will serve as an important focal point for round two on Sunday.

Highs today get into the 70's away from the coast, 60's at the Shore.  The warmest air will likely be along I-95 and just east -- mid 70's are do-able, with some upper 70's possible in Southern Delaware.  If there is more sun and less cloud cover this afternoon, we might coax temperatures higher than our projections of 75 in Philadelphia.  However, after 5 or 6 PM, the odds for a round of showers or thunder through the region will increase and that should bring an end to our party of relative warmth.