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Upstate/Eastern New York


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NWS take, as of now..

Of concern in the upper levels next week is a closed low over the
Hudson Bay, spanning its associated trough south across the mid-
western states. This trough will allow an additional potent
shortwave to pass through its base Tuesday night, which will help
advance the trough east and pull the closed low south out of the
Hudson Bay and into the Northern Great Lakes by Wednesday night. The
closed low will continue to allow a few shortwaves to rotate through
while it crosses overhead of the Great Lakes Thursday before heading
northeast into the Canadian Maritimes. Upper level ridging will then
ensue for the end of the work week.

Thus, to start off the period on Tuesday, a shortwave passage
through the aforementioned upper level trough to our west will have
a well defined cold frontal boundary also placed to our west. While
the next potent shortwave rounds the base of the upper level trough,
this will not only slowly advance the cold front east Tuesday, but
also induce a surface low to form over Missouri/Illinois. This low
will then progress northeast overhead of NY state, and cross the
state with the cold front late Tuesday night and Wednesday.
Therefore, expect a dry start to the day on Tuesday with chances for
some rain showers to increase late Tuesday afternoon through
Wednesday. Ahead of the frontal passage Tuesday, some warm air
advection will lie overhead, which will allow for some highs in the
50s and a few low 60s. These mild spring temperatures won`t last
long due to the passages of the front. A much colder air mass will
work its way across the region Wednesday, with nearly a 15 degree
drop in temperature at 850mb. High temperatures Wednesday will
likely occur early in the day before the frontal passage, with highs
in the upper 40s and low 50s.

As the surface low departs northeast out of the area, only chances
for a few snow showers will lie across the far eastern portions of
the area Wednesday night. Yet another shortwave will pass through
the now upper level closed low, which will interact with the
leftover wrap around moisture Thursday to produce a few more early
morning rain/snow showers before switching to all rain due to the
addition of the sun for places across the Finger Lakes region and to
its east. Cold air overhead will continue to support highs in the
upper 40s and low 50s Thursday.
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