Wednesday, May 29, 2013

Warmin' Up With A Chance Of Thunder


We're about to set forth into the season's first heat wave and Philadelphia's first 90 degree day -- both start tomorrow. Today is the warm introduction to the several day stretch of summer in the Delaware Valley, marked with temperatures that will bounce into the 85-88 range across the Delaware Valley by day's end.  We will see more sunshine than yesterday although skies will have some cloudiness overhead from time to time.

One thing we will have to watch for this afternoon is the risk for pop up thunderstorms or a scattered line of thunder to fire to our west and northwest.  The NAM and GFS both suggest the potential for a few areas of thunder around the region after 2 PM tomorrow thanks to a weak trough pushing through the region on the heels of an advancing warm front.  A slight risk of severe weather is out north of I-78 where thunderstorm concentration could be a bit more substantial and thunderstorms may contain the risk of strong winds...best chances of any severe may ultimately be across Upstate New York or right along the PA/NY border along the warm front itself.  However, there is enough instability around that a few thunderstorms may pop in the afternoon hours around here....odds, for now, don't favor any severe weather.