7:00 AM | *"Clipper" system and an ocean storm to generate rain and/or snow around here on Friday and Friday night...spring fever alert for Monday*
Paul Dorian
6-Day forecast for the Philadelphia, PA metro region
Today
Mainly sunny, cooler than yesterday, but with little wind, highs near 50 degrees
Tonight
Partly cloudy, cold, lows in the low-to-mid 30’s
Friday
Mainly cloudy, cold, occasional rain is likely during the afternoon and it can be mixed with flakes at times, mid 40’s for afternoon highs
Friday Night
Mainly cloudy, cold, breezy, chance for rain and/or snow, small grassy accumulations are possible, near 30 degrees for late night lows
Saturday
Mainly sunny, quite breezy, chilly, low-to-mid 40’s
Sunday
Mainly sunny, milder, upper 50’s
Monday
Spring fever alert...Mainly sunny, even warmer, mid 60’s
Tuesday
Mainly cloudy, still warm, chance of showers, lower 60’s
Discussion
A strong “clipper” system will drop southeastward on Friday across the Great Lakes and into the northeastern part of the nation and it’ll create lots of instability in the atmosphere around here. At the same time, the southern storm that continues to produce significant rainfall in the southern states will intensify as it moves off the east coast and out over the western Atlantic. While this storm will be well off the east coast by late Friday, there can be an inverted trough (aka “norlun” trough) extending from the low pressure center all the way back to the Mid-Atlantic region which will also contribute to some instability in the atmosphere. The combination of the “clipper” system and the inverted trough is likely to lead initially to rain on Friday and then some rain and/or snow is likely on Friday night with small grassy accumulations possible; especially, in higher elevations locations of the northern and western suburbs. The weekend will start off on the chilly and dry side, but a big time warm up will take place early next week. In fact, Monday will turn out to be a "spring fever" alert type of day with sunshine and afternoon highs in the 60's.
Meteorologist Paul Dorian
Perspecta, Inc.
perspectaweather.com