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  Saturday March 25, 2023


NWS Area Forecast Discussion

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FXUS61 KBTV 201942

Area Forecast Discussion
National Weather Service Burlington VT
342 PM EDT Mon Mar 20 2023

Brisk south to southwest winds will relax tonight leading to
seasonably chilly conditions. Chances for snow showers will increase
by morning over northwestern portions of northern New York,
then more valley rain and mountain snow showers will develop
during the day. These showers gradually will progress southward
associated with a weak cold frontal passage. Thereafter, milder
weather and a wet period is expected Wednesday night through
Thursday, followed by a more potent storm that may impact the
region over the weekend.


As of 341 PM EDT Monday...As the spring Equinox arrives this
evening and sun sets on the day, the mainly fair weather cumulus
present towards the International Border will give way to clear
skies. That region will join the rest of our Vermont and New
York, while breezes relax as a nocturnal inversion develops.
However, with a modestly strong low level jet focused on the
southern half of the region and at least 15 knots of westerly
flow at 925 millibars areawide tonight, don`t expect total
decoupling to support tanking temperatures despite clear skies.
Where a snow cover is most fresh and winds subside temperatures
should cool most effectively tonight, but generally have lows in
the 22 to 32 range, mildest in the wide valleys of the
Champlain and St. Lawrence.

While no significant impacts are expected, do expect to see
quite a bit of elevation-dependent snow shower activity across
most of our region tomorrow associated with a weak cold front.
Precipitation amounts, mainly a trace to 0.1" but locally up to
0.2" in the higher terrain, will be limited by both moisture and
lift. However, there will be enough instability and forcing for
ascent to see showers, with briefly heavier elements, blossom
during the day. The more organized snow showers will be in the
early morning hours closer to the better moisture source (Lake
Ontario). Over time, transport of low level west- southwesterly
flow generally will pool moisture along the front farther east,
especially the northern half of Vermont. As the air mass aloft
will be sufficiently cold, it will be a boundary layer question
for precipitation type at the surface.

With springtime mixing depths, even with snow cover lower
elevation sites will have too deep of a warm layer to see snow
and surface temperatures rise into the 37 to 42 range, or even
milder in our southern valleys. Snow levels generally look to
have a north to south gradient and be roughly 1000-1500 feet
when greatest chances of precipitation occurs, thereafter
falling from north to south as colder air aloft slides southward
along with the cold front. Behind the front, lighter snow
showers will likely continue in the favored upslope locations as
moisture depth decreases but blocked northwest flow helps
squeeze out some precipitation. By late evening, little or no
precipitation should be remaining in our area and precipitation
chance drop to nil by daybreak Wednesday. Another surge of low
level wind and potential lingering cloud cover leads to forecast
temperatures tomorrow night being a bit milder than normal in
northern New York/south central Vermont, but closer to normal in
northern/northeastern Vermont.


As of 307 PM EDT Monday...The pattern becomes active again for the
middle of the week, but not until Wednesday night where before that,
surface high pressure and a weak upper ridge will support dry
conditions for Wednesday with highs ranging from the upper 30s along
the international border to around 50 in the lower Connecticut River
Valley. Thereafter, a surface frontal boundary will lift northward
through the region Wednesday night with perhaps some scattered
valley rain and mountain snow showers, but better forcing won`t
arrive until Thursday where shortwave energy ejecting from a
decaying upper trough over the northern plains will ride eastward
along a fast westerly flow aloft and bring numerous rain showers to
the region as the aforementioned warm front sags back south as a
cold front. Right now medium range guidance isn`t in great agreement
with how much QPF we`ll see, but a general tenth to quarter inch
seems reasonable. Showers taper off Thursday night as the front
moves south of the forecast area. Highs Thursday will range through
the 40s.


As of 307 PM EDT Monday...Heading into the end of the work week and
weekend the focus shifts toward the potential for an strong low
pressure system to impact the region over the weekend. Strong
surface high pressure centered over Quebec will bring a partly sunny
and dry day for Friday with highs back to seasonal normals in the
upper 30s to low 40s. But by Friday night, low pressure looks to
develop over the lower Mississippi River Valley and track into the
Ohio Valley by Saturday morning. Thereafter, there is a general
consensus in the long range guidance that this primary low will
continue northward through the Great Lakes Saturday/Saturday night,
while secondary cyclogenesis occurs along the mid-Atlantic coast. As
is to be expected this far out, just how deep this secondary low can
develop and it`s track is highly uncertain, and will play a large
role in the ptype forecast heading into Saturday night and Sunday.
Given it`ll be late March with an increasingly higher sun angle,
surface temperatures will be marginally warm above freezing, but
colder air may persist mid-slope to the summits allowing for a
wintry mix or all snow. At this point, we continue to increase PoPs
as it`s almost a certainty it will precipitate, but we`ll offer up
valley rain and mountain snow for the ptype for starters, but
certainly can`t rule out anything at this time.


Through 18z Tuesday...VFR conditions, except for possible
continued MVFR cigs at SLK through 21Z, persist through most of
the period. Increasing clouds associated with scattered showers
lower ceilings late in the period behind a weak cold front with
MSS/SLK most likely to have persistent MVFR cigs. The showers,
mainly in the form of snow, are most likely to impact the MSS
terminal where 2sm visibility is indicated between 09Z and 14Z,
but at times could cause brief IFR visibility at EFK/SLK/BTV,
primarily 13Z onward.

South/southwest winds 10 to 15 knots with gusts 20 to 25 knots
will subside around sunset. Localized wind shear is possible
near Rutland with areas of turbulence likely near trrn features
today due to the moderately strong low level jet of 30 to 40
knots around 2500 ft agl. While speeds will pick up after
sunrise, they will be less gusty than today and under 20 knots. The
aforementioned frontal boundary should induce a sharp wind
shift to north/northwest towards the end of the TAF period at
PBG and just afterwards at BTV.


Tuesday Night: VFR. NO SIG WX.
Wednesday: VFR. Chance SHRA.
Wednesday Night: Mainly VFR, with areas MVFR possible. Chance
Thursday: Mainly MVFR, with local VFR possible. Likely SHRA.
Thursday Night: Mainly MVFR, with local IFR possible. Chance
SHRA, Chance SHSN.
Friday: Mainly VFR, with areas MVFR possible. Slight chance SHRA,
Slight chance SHSN.
Friday Night: Mainly VFR, with local MVFR possible. Slight chance
SHSN, Slight chance SHRA.
Saturday: VFR. Chance SHRA, Chance SHSN.




NEAR TERM...Kutikoff
LONG TERM...Lahiff

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