A weak cold front over the eastern Great Lakes will approach the New York City and Philadelphia metropolitan areas this afternoon and will kick of a wild roller coaster ride of temperatures this week.
The cold front will move through the Northern Mid Atlantic this afternoon with scattered to broken cloud cover and a few isolated showers. The showers are not expected to have much of an impact and most locations will remain dry. Temperatures will be near normal with most locations in the mid to upper 70’s for highs.
Behind the cold front, a cool Polar air mass will take hold with clearing skies by tomorrow morning. This high pressure system will drop to the southeast from the Great Lakes towards the southern Mid Atlantic coast tomorrow through Tuesday. Temperatures will average near to slightly below normal with high temperatures ranging from the upper 60’s to mid 70’s and low temperatures in the 40’s and 50’s.
By Tuesday night, the high pressure system will be off the Mid Atlantic coast and there begins the major warm up for the rest of the week! A large upper level ridge will build from the Southeast into the Northern Mid Atlantic on Wednesday and with it very strong warm air advection! Temperatures will warm steadily into the upper 70’s to lower 80’s on Wednesday afternoon followed by lows in the 60’s on Thursday morning. Weak warm fronts and disturbances will move through the region Wednesday afternoon and Thursday leading to the potential for isolated thunderstorms, however I think this threat will be focused further west where lifting will be stronger. Under the influence of strong warm air advection though, high temperatures will push into the mid to upper 80’s once again, possibly touching 90 in the Philadelphia metropolitan area! This warm air mass will remain in place through Friday evening, then another crash is on the way!
A powerful Polar cold front will move through on Friday evening with showers and strong to severe thunderstorms. This cold front appears to pack plenty of upper level support and may lead to some very impressive thunderstorm lines to develop. Timing is everything of course. By Saturday morning high pressure will take hold and everyone will know a new air mass is in charge! Temperatures will struggle in the 50’s and 60’s on Saturday, a good 20 to 25 degree drop from Friday afternoon.
An area of low pressure is expected to develop along the cold front over the Mississippi Valley on Saturday and move towards the Mid Atlantic on Sunday. The combination of this low pressure system and high pressure to the north may lead to some windy conditions along with periods of steady rainfall. Sunday is looking very cool and raw.
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