Area Forecast Discussion
Issued by NWS Albany, NY

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FXUS61 KALY 232155
AFDALY

Area Forecast Discussion
National Weather Service Albany NY
455 PM EST Fri Feb 23 2018

.SYNOPSIS...
Wet and dreary weather will continue into tonight. It will be
milder and mainly dry on Saturday, however another round of
mixed precipitation and rain is expected Saturday night into
Sunday.

&&

.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
Area of showers associated with isentropic lift are now covering
much of the forecast area. Back edge of this area has passed through
Syracuse and Binghamton, so will trend PoPs downward late this
afternoon into the evening as low level winds continue to veer and
isentropic lift wanes. Temperatures remain near the freezing mark
over the advisory area, so will leave the advisory going into the
evening. Outside of the advisory area, not expecting any impacts.
Icing reports have been minimal across the area thus far today.

Tonight, cold and dry advection will be delayed with the upstream
surface high still well off to the west over the central Plains. So
while more robust forcing for ascent wanes, we could still be
looking at areas of low clouds and light showers or drizzle.
Temperatures should remain steady or may actually come up a couple
of degrees as the gradual shift of the low level winds to westerly
will scour out some of the lingering colder near-surface air. Spots
of freezing rain or drizzle may persist into the nighttime for parts
of the southern Adirondacks.


&&

.SHORT TERM /6 AM SATURDAY MORNING THROUGH MONDAY NIGHT/...
Mainly dry weather is expected Saturday as higher pressure
builds in along with above normal temperatures, nothing like
earlier in the week, with highs in the upper 30s to around 50
degrees.

Another round precipitation expected Saturday night and Sunday
as a low pressure system approaches and moves across the region.
Overrunning precipitation is expected to overspread the area
Saturday night mainly after midnight as the system`s warm front
approaches. Temperatures are forecast to drop into the upper 20s
to upper 30s Saturday evening setting the stage for mixed
precipitation. A wintry mix is expected mainly across the higher
terrain, generally above 1000 feet, eventually transitioning to
plain rain Sunday morning. Before this occur a light accumulation
of snow and/or sleet is expected generally north of I-90. A
period of freezing rain is expected Sunday morning across the
higher terrain with a light ice accretion. A winter weather
advisory will likely be needed. A changeover to plain rain is
expected Sunday morning with rain continue well into the afternoon
as the system occludes as it moves across the area. Runoff
would result in some river rises and could cause movement of ice
jams. If confidence for flooding increases then a flood watch
and/or hydrologic advisory will need to be issued.

East to southeast flow ahead of the approaching system will
increase and become gusty late Saturday night into Sunday across
southern Vermont, the Berkshires, the Taconics, western
Adirondacks, western Mohawk Valley and the Schoharie Valley.

Higher pressure will build in at the surface behind the system
with the flow aloft flattening resulting in continued above
normal temperatures. With the help of sunshine on Monday expecting
highs mainly 40s across the area with lower 50s in the mid
Hudson Valley.

&&

.LONG TERM /TUESDAY THROUGH FRIDAY/...
High pressure will be in control at the start of the extended
period, but will be departing off the coast of the mid-Atlantic
States during the midweek period.  Although there continues to be
some timing differences within the model and ensemble guidance, dry
and quiet weather is expected for at least Tuesday into Tuesday
night (and probably through Wednesday as well). With a southerly
flow in place, above normal temperatures are expected, with highs on
Tuesday mainly in the 40s and lows on Tuesday night in the mid 20s
to mid 30s.  Highs on Wednesday should reach the mid 40s to mid 50s,
with increasing clouds.

The next system will be approaching from the southwest, although its
still difficult to say how quickly it moves in and just how much
precip is expected. The track and evolution of this storm is still
unknown, as its possible that the initial storm system cuts off over
the Great Lakes and a new storm forms along the mid-Atlantic
coastline.

Based on the model guidance, our area could be seeing some light
precipitation as early as Wednesday night if the GFS is correct or
perhaps as late as Thursday or Thursday night (based on some
ensemble solutions and the 12z GGEM). The 12z ECMWF even suggests
that the storm never makes it this far north, as the majority of the
moisture gets shunted to the south of the region as well as the
reformed storm system slides eastward offshore.

If the GFS is correct, p-type would primarily be light rain,
although some light snow or mixed precip is possible for both the
onset and ending of the storm, mainly for the high terrain and
northern areas.  The other models and some ensemble solutions would
suggest the possibility of some snow across the area, so it will
ultimately depend on storm track.  For now, have kept temps closer
to the model blend guidance, which suggest highs on Thurs/Fri in the
30s and 40s and lows in the 20s and 30s, although these could be
lower depending on the exact storm track and evolution.

&&

.AVIATION /21Z FRIDAY THROUGH WEDNESDAY/...
Showers will continue to increase across the terminal corridor
into mid-afternoon, with cigs and vsby dropping to MVFR/IFR.
P-type expected to be mainly liquid, although some brief
sleet/snow cannot be ruled out early this afternoon. With
temperatures near freezing, some light freezing rain is
expected at KGFL/KPSF this afternoon. Showers will diminish
after 00Z, but some lingering spotty showers or drizzle could
continue. With a steep inversion developing, low clouds and mist
are a good possibility overnight, at least through 06Z, before
low-level winds turn westerly and usher in a bit drier air. KPOU
may remain socked in all night.

Improving conditions Saturday with cigs becoming VFR shortly
after sunrise as high pressure briefly builds in.

Winds will be south to southeast for the rest of the day at
around 10 kt. These winds will gradually shift westerly
overnight while diminishing to around 5 kt, but mainly light
and variable at KPOU. Surface winds should be light enough to
support low-level wind shear conditions overnight at at least
KPOU/KPSF. West to northwest winds Saturday morning into early
afternoon will increase to around 10 kt with some gusts around
20 kt at KALB/KPSF.

Outlook...

Saturday Night: High Operational Impact. Definite RA...SN...SLEET.
Sunday: High Operational Impact. Breezy Definite RA.
Sunday Night: No Operational Impact. NO SIG WX.
Monday: No Operational Impact. NO SIG WX.
Monday Night: No Operational Impact. NO SIG WX.
Tuesday: No Operational Impact. NO SIG WX.
Tuesday Night: No Operational Impact. NO SIG WX.
Wednesday: No Operational Impact. NO SIG WX.

&&

.HYDROLOGY...
Flood waters have receded and the flood warning and advisories
were cancelled earlier today. Ice jams remain in place on multiple
locations on the Mohawk River from about Lock 9 through the Twin
Bridges and on the upper Hudson River in central Warren County.

Precipitation will be light through this evening with mainly
dry weather into Saturday evening. However, widespread precipitation
will overspread the area Saturday night and continue most of
Sunday as another low pressure system approaches and moves across
the region. A wintry mix is expected mainly across the higher
terrain, generally above 1000 feet, eventually transitioning to
plain rain Sunday morning. At this time QPF amounts of about an
inch are expected. Temperatures will be above normal Saturday
but only expecting highs in the upper 30s to about 50 degrees
with temperatures dropping back into the upper 20s to upper 30s
Saturday night which will limit snowmelt. Runoff would result in
some river rises and could cause movement of ice jams. If
confidence for flooding increases then a flood watch and/or
hydrologic advisory will need to be issued.

For details on specific area rivers and lakes, including
observed and forecast river stages and lake elevations, please
visit the Advanced Hydrologic Prediction Service /AHPS/ graphs
on our website.

&&

.ALY WATCHES/WARNINGS/ADVISORIES...
CT...None.
NY...Winter Weather Advisory until 10 PM EST this evening for
     NYZ032-033-038>042-047-048-051-058-063-082-083.
MA...Winter Weather Advisory until 10 PM EST this evening for
     MAZ001-025.
VT...Winter Weather Advisory until 10 PM EST this evening for
     VTZ013-014.

&&

$$
SYNOPSIS...IAA
NEAR TERM...Thompson
SHORT TERM...IAA
LONG TERM...Frugis
AVIATION...Thompson
HYDROLOGY...IAA



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