AREA FORECAST DISCUSSION
National Weather Service Albany NY
616 AM EST Mon Jan 9 2023
.SYNOPSIS...
Mainly dry weather will continue into the middle of the
upcoming week with temperatures remaining a bit milder than normal.
A stronger system is expected to bring periods of rain and snow to
the area for the end of the week.
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.LONG TERM /THURSDAY THROUGH SUNDAY/...
The main focus during the long-term forecast period will be on the
prospects of a potent, cross-country, southern stream storm system
that`s expected to impact the forecast area later this week into
next weekend. There`s a lot to figure out between now and then as
the main energy from this vigorous mid-level storm system,
associated with an intense Atmospheric River (AR) event that`s
impacting California, is still offshore the coast of California in
the Pacific Ocean. This storm system is expected to come onshore the
coast of California on Tuesday. As it tracks eastward, its expected
to become fragmented over the Rocky Mountains before re-organizing
over the Plains after its emergence out of the Rockies.
We start off the period Thursday morning with light precipitation,
courtesy of a northern stream shortwave and isentropic lifting ahead
of the storm system, overspreading at least parts of the forecast
area. As the main aforementioned storm attached to the southern
stream draws closer to the region, heavier precipitation will
overspread the area Thursday evening/night into Friday. As the storm
system quickly lifts northeast of the area, precipitation will
become lighter and more scattered Friday into Friday night. By
Saturday, any linger scattered precipitation will come to an end
from west to east as the storm system continues to lift further away
from the area.
As mentioned earlier, there is still a lot of details to iron out
with this storm system as there still remains quite a bit of spread
in model/ensemble guidance and run-to-run inconsistencies with
regards to the track, synoptic/mesoscale evolution of the pattern
and storm, timing, scope, etc. As far as precipitation type, it
still looks like we will see a combination of rain and snow (with
maybe some pellets of sleet) over the area with the northern
sections and mountain areas more favored for wintry precipitation
while the southern areas and valley areas are more favored to see
mostly rain. As far as timing, Thursday into Friday, p-types will
mainly be rain or a rain/snow mix at times over the valley areas
with p-types in the form of snow or a rain/snow mix at times over
the mountains. There could be some pellets of sleet mixed in at
times as well. Friday night into Saturday, colder air advects into
the region effectively changing all precipitation over to snow.
Coverage looks to be scattered during this time. A key factor in
determine the precise precipitation types (p-types) will be
determining the amount of available cold air reservoir and/or
production that this storm can generate. Furthermore, there is
potential for this storm to produce quite a bit of precipitation
being a cross country storm with Pacific origin tapping into Gulf of
Mexico (GOM) and Atlantic Ocean source regions. However, the
evolution and speed of the storm system will greatly impact this
potential. Bottom line, while the finer details and overall impacts
are uncertain, expect for a storm system to impact the region with
widespread precipitation late this week into next weekend. Most
areas are expected to see a combination of rain/snow (maybe a few
sleet pellets) with the valley areas favored to see mainly rain and
the mountains mainly wintry precipitation. Drier weather returns to
the area Saturday into Sunday as the storm system departs and high
pressure develops in its wake.
As far as temperatures, the long-term period will remain mild with
temperatures continuing to run above normal levels.