New York Metro Weather
Winter Storm Advisory
4:00 PM Wednesday December 30th, 2009

...This is not an official National Weather Service product and should not
be confused for an official watch, warning or advisory...

In New York: Putnam, Orange, Rockland, Westchester, Manhattan,
Bronx, Richmond, Kings, Queens, Nassau, Suffolk

In New Jersey: Sussex, Passaic, Bergen, Morris, Warren, Middlesex, Essex,
Hudson, Hunterdon, Bergen, Union

In Connecticut: Litchfield, Farfield, New Haven

...Winter Storm Advisory remains in effect through 100pm Friday

2:30pm Thursday Dec 31 2009:


Snowfall has ended across much of the forecast area in response to the
initial shortwave and area of low pressure. Most regions have picked up at
least an inch or two of snowfall. A second area of support aloft is expected to
aid in the development of a low pressure area offshore. The result should
be light precipitation across the area beginning around or after 00z this
evening. This feature should not be as robust as this morning, but the
potential still remains for an inch of snow or sleet. Additionally, forecast
soundings indicate the potential for freezing rain or drizzle along the coast
line. As a result, with holiday travel underway, the advisories have been
extended to include the Metro area and continue through 1pm Friday.

The previous, original discussion remains below for archiving


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A storm system is expected to develop off the Middle Atlantic coast
Thursday and shift eastward towards the 40/70 benchmark. It is currently
expected that there will be two storm systems, and two upper level pieces
of energy which help to spawn them off the coast. The initial system is 
expected to begin impacting the area by Thursday Afternoon. The 
precipitation is expected to begin as light snow across most of the forecast
area. A changeover to some light rain is possible by the end of this
precipitation along the immediate coast including Long Island and the
southern shores of Connecticut. Just inland, model guidance indicates
sufficient cold air for frozen precipitation, although there may also
be periods of sleet or even possibly freezing rain in these areas.

It is generally expected that 1-3 inches of snowfall will fall from this first
wave of low pressure across the advisory region overnight Thursday. The
result will be slick/dangerous travel on New Years Eve across these 
regions. There may also be some travel hazards and delays on Long
Island and the New York Metro as a Trace to an inch of snow may fall
in these areas.

The second area of low pressure will develop early Friday and strengthen
as it passes to our southeast. An area of light precipitation could overspread
the region--with the same areas that are included in the advisory receiving
an additional inch or two of snowfall. Although confidence on this occurring
is not terribly high given the low pressure positioned well to our east, the
presence of strong winds...the potential for dropping temperatures as the
system passes, and the aforementioned potential for snowfall leads us to
continue the advisory through Friday Night across the region.

Please remain abreast of the situation and drive carefully on the holiday. Please

stay tuned for more  updates and safety information.

...A winter storm advisory means that snow, sleet, or freezing rain will
cause travel difficulties or hazards. Travel may become extremely
hazardous for periods of time. Visibilities may be lowered. Exercise
caution if you must travel during the storm. Stay tuned for more updates...