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Rumbles of Thunder & Flashes of Lightning to Start December in NYC!

Flood Watch in Effect tonight Through Tomorrow.

Good Morning,

Clouds are starting to spread out across the eastern third of the nation early today... And, even

though it'll be milder than yesterday was, cloud coverage will become more and more widespread, and

these will tend to lower and thicken by midday... Most temperatures will be in the mid-50s this

afternoon... None of the thinking has changed all that much since yesterday... But we'll have to keep a

close eye on the regional radar mosaic early today, which is showing some light rain in West Virginia, as

well as in western/central Pennsylvania... This light rain, associated with the leading edge of mild, moist

air flowing northward (a 'warm front'), should slide by areas relatively close to the I-95 corridor for the

balance of the morning and into early this afternoon... Therefore, for places like Lancaster and

Harrisburg, PA as well as all of Philadelphia's northern and western suburbs, the Lehigh Valley/Greater

Allentown Area and in northwestern New Jersey (and probably within 20 or 25 miles of New York City),

it'll be worth our while to mention a touch of rain or drizzle today at VIRTUALLY ANY TIME... We certainly

can see how there's a brief period of rain (which lasts for about an hour or two) this morning, but then

rain in many of these aforementioned places doesn't return until very late today or tonight... The

confidence level is greater along the coastal plain (generally for I-95 and all points east) that while it'll

be cloudy today, the bulk of the rain should hold off until tonight...

The cold front on this morning's weather map over the Great Lakes that extends southward into the

Mississippi Valley is going to approach the East Coast late today and tonight, but it will be slowed down

by the eventual development of a wave of low pressure forming near the Delmarva Peninsula... These

too, are thoughts which have been preserved since yesterday's forecasts were issued... Some strong

dynamics associated with a low-level jet pushing our mild and moist air along the East Coast tonight and

tomorrow morning will lead to some pockets of heavy rain, temperatures during the night which will

either hold steady or even rise in some communities, and even a couple of thunderstorms -- any of

which could be heavy and gusty... Flood watches as of this writing covered most of Pennsylvania, but

didn't include the southeastern corner of the state... Flood watches were also in effect for Warren and

Sussex counties in northwestern New Jersey, but not in New York -- expect that to change here during

the course of the morning... It appears likely now that with the favorable dynamics, the slow-moving

front and the negatively-tilted upper trough axis, the steadiest and heaviest rain along the I-95 corridor

will arrive very late tonight and should last into tomorrow... The rain should taper off by 1 or 2 p.m.

tomorrow in eastern Pennsylvania, but it'll take an additional 3-6 hours to end farther east (including

across the Greater N.Y.C. Metro Area)...

We're anticipating the arrival of moderately colder air late tomorrow and tomorrow night... A race

between drier air pushing in from the west and our departing moisture should ultimately determine

whether or not tomorrow's rain could end as a period of wet snow in the mountains, as well in the

suburbs located north and west of the big, coastal cities... Temperatures on Thursday and Friday will be

mostly in the low and mid-40s, and both days are also looking dry... Have a good day !!!



Posted by WABC on November 30, 2010 | Permalink


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