Philly, New York, and Boston face major snow
While the Washington, D.C. area awaits a modest 1-3" type snowstorm, the big cities of the Northeast prepare for their second major, perhaps crippling snowstorm of the 2010-2011 season.
Two areas of low pressure - one from the Ohio Valley and a second off the Carolina coast - will consolidate into single powerful storm off the northern mid-Atlantic coast and then explosively develop into a classic East Coast "bomb" or Nor'Easter. (The low pressure is projected to deepen more than 30 mb in 24 hours, meeting the criteria for bombogenesis)
Philadelphia will be on the southern side of the rapid intensification and may only get 4-8". But New York City is likely to pick up 6-12" or so, with Boston hitting the jackpot in the 12-16" range.
Snowfall rates could be quite high especially from just northeast of Philadelphia into southeast Maine where there is the potential for thundersnow due to the energy associated with the storm development according to NOAA's Storm Prediction Center. Regions impacted by thundersnow could see snowfall rates of 3" an hour or so.
The snow will begin this evening in Philadelphia between 6 and 10 p.m. and progress toward New York city between 8 p.m. and midnight. The Boston region should see the onset of snow just after midnight.
The snow will end first in Philadelphia Wednesday morning but will take until mid-to-late afternoon to taper off in New York and early-to-mid evening in Boston. Expect significant flight delays and possible cancellations in these cities.
New York and especially Boston will also have to contend with increasing winds. Winds of 20-25 mph with gusts over 40 mph are possible Wednesday afternoon and evening in Boston.
Due to its relatively fast forward speed, amounts will not generally be as great for this storm as the Boxing Day Blizzard of 12/26 for Philadelphia and New York. However, the storm may slow down enough by the time it reaches Boston for the storm to match 12/26 totals there.
Here are some great blogs on the Northeast storm potential:
HAM Weather: Another Big Northeast Snowstorm
Weather Journal: Big Snows Return to Big Apple
New England weather blog (Matt Noyes): Updated Expectations for Tuesday Night/Wednesday Storm
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