Thursday, June 14, 2007

Much Cooler weather on tap through Friday.

A pesky Closed/Cutoff low, now positioned off the Central New England coast will continue to influence our weather through Friday. Over the past several days this system, allowed the atmosphere to become very unstable, and produced rounds of thunderstorm activity, too which some were Severe in the Delaware Valley. During that timeframe, the Cutoff low was just south of Nova Scotia, and induced a North to Northeast flow of air. With us being far enough from it's center, pockets of colder air aloft, and induced moisture at mid levels, this allowed daytime heating to produce and unstable atmosphere.

This closed low has retrograded South and Southwestward over the past 24 to 36 hours and has positioned itself closer to our area, This has allowed us to be in a more, NE and Easterly flow of Marine air, which has stabilized the atmosphere. Therefore we now can expect cooler air from the Ocean and low level cloudiness for much of today and tomorrow. Temperatures will struggle to reach 70 today and low to mid 70's for tomorrow. Skies will be M.Cloudy, but some breaks of sunshine are possible both this afternoon and tomorrow afternoon, as High pressure presses into Northern New England. This High will send some drier air southward into the region, just enough to break up the clouds. I'm not expecting any showers through tomorrow, so we should be rain free.

So in Closing,
For Today expect M.Cloudy skies and cool temperatures ranging from the mid 60's to near 70. A few breaks of sunshine are possible this afternoon, especially west of PHL.

Tonight: M.Cloudy and cool with lows of 55 to 60.

Friday: Variably Cloudy and continued cool with some breaks of sunshine once again. High will be mainly in the lower to mid 70's.

More on the upcoming weekend tomorrow, It now looks Dry with a warm up on the way. We should return to temperatures in the 80's and increasing Humidity.

The Latest Surface Map and Composite:
Click map to enlarge:

Take Care,

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