Like A Traffic Jam On The Schuylkill...

...so goes the latest cold front to approach the region. Yeah, another one of these slow-to-approach and slow-to-cross cold fronts is inching towards Philadelphia and will have us in the warm sector until the wee hours of Wednesday morning.   The slow march, then stall, and then a final move of the front as it waits for low pressure to develop and lift northeast along the front means we'll coax one warm day out of the coming week, with temperatures hitting or exceeding 80 in Philly tomorrow afternoon.   All the while, a chance for showers and storms will exist across Western and Central Pennsylvania tonight, with Western Pennsylvania seeing more thunderstorm activity develop tomorrow afternoon as the low lifts north and agitates the front.

Until Tuesday night, Southeastern Pennsylvania is poised to remain dry -- although a shower or two can't be ruled out as close as the northern and western burbs as an area of showers moves through this evening.   The NAM, GFS, and most computer guidance keep the showers away from Philadelphia until Tuesday night.

The front will gradually approach on Tuesday evening, working east as low pressure rides along the front to the northeast.   Showers and thunderstorms develop along the front and lift northeast as the front marches east, with the potential for some severe thunderstorms in parts of Central Pennsylvania tomorrow afternoon, possibly into Eastern Pennsylvania tomorrow night depending on how the front moves.  The northern and western suburbs, along with Central Pennsylvania, are under a slight risk for severe weather for Tuesday and Tuesday night.  Gusty winds and heavy rains are possible with any thunderstorms that develop.   The threat for flooding around here is low but some stream rises can't be ruled out if heavier thunderstorms track into the region.

Most of the activity is poised to move through the region Tuesday night and midday Wednesday, first as possible thunderstorms across Central into Eastern PA, secondly followed by an area of steadier showers or rain that may lift through the region during the morning hours.