Area Forecast Discussion
Issued by NWS Burlington, VT

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FXUS61 KBTV 252326

Area Forecast Discussion
National Weather Service Burlington VT
726 PM EDT Sun Sep 25 2016

Tranquil early fall weather will persist through Monday, as a
large area of Canadian high pressure crosses the region. The crisp
air mass will allow areas frost to develop once again tonight,
with lows generally ranging through the 30s. Developing southerly
winds will allow for moderating temperatures on Monday, with high
temperatures reaching the mid to upper 60s in most valley
locations. A frontal system approaching from the west will bring
our next rainfall event Monday night into Tuesday.


As of 718 PM EDT Sunday...For tonight, surface high pressure
extending wrn Quebec southward into central NY/PA will drift very
slowly ewd. Lingering fair wx cumulus clouds have dissipated with
onset of diurnal cooling cycle, and will just see a few cirrus
from time to time drifting ewd from the ern Great Lakes, per IR
imagery at 2300Z. With little airmass change from last night and
winds aloft lighter, we should see even better radiative cooling
conditions than this morning. Despite 925-850mb temps warmer than
last night, surface temps area-wide should be a few degrees cooler
producing more areal coverage of frost. Have maintained frost
advisories and freeze warnings for just about all of the BTV CWA,
excluding Grand Isle County where warmer Lake Champlain waters
should keep temps in the upper 30s to low 40s. Elsewhere, lows
will widely ranging through the 30s, with some upper 20s possible
in the Northeast Kingdom and locally low/mid 20s in the colder
hollows of the Northern Adirondacks (i.e. KSLK). In addition,
unlike last night where winds aloft mitigated fog development,
expect to see some patchy dense fog develop in the usual climo
favored river valleys after midnight.

On Monday, the aforementioned high shifts off the New England
coast allowing winds to shift to the south and temperatures to
warm to more seasonal values in the mid to upper 60s. We`ll start
the Monday under full sunshine with any morning fog burning off,
but as we progress into the afternoon we anticipate some
increasing mid and upper level clouds from west as a large closed
low approaches. Any rain showers associated with this system
should hold off until Monday night though.


As of 430 PM EDT Sunday...Models continue to be consistent with
large 500mb trough associated with surface closed low pressure
system over southwestern Ontario with a frontal boundary extending
southward across the eastern Great Lakes moving eastward. This
system will bring a strong 850mb jet of 35-45kts across the region
from west to east Monday night and PWATs greater than 1 inch.
Latest NAM and GFS show low level deformation with the front
weakening as it moves across the North Country Tuesday morning.
Therefore expect best chances for rain showers across Northern New
York and especially in SW facing slopes as the low level jet will
lead to shadowing affects on leeward facing slopes and valleys.

On Tuesday, bulk of precip will affect the Green Mountains and
Northeast Kingdom but with SW flow continuing and the cold front
bringing cooler air over Lake Ontario, the St Lawrence valley
could see some lake effect rain showers. Expect precip to end
Tuesday night as the frontal system moves into the Atlantic, while
the 500mb low retrogrades towards Chicago.


As of 430 PM EDT Sunday...With 500mb low becoming cutoff, there
could still be slight to low chances for rain showers throughout
the period as models have difficulty determining movement of the
low. It does appear that bulk of energy will be south and west
with light northeast flow persisting over the North Country. This
will keep clouds around with temperatures during the day reaching
the 60s and and at night generally in the 40s throughout the long


.AVIATION /00Z Monday THROUGH Friday/...
Through 00Z Tuesday...Mainly VFR conditions are once again
expected throughout the period, with the typical exception being
the high likelihood of VLIFR in FG/FZFG at KSLK/KMPV from 05-13Z.
Light and variable winds overnight will pick up from the South-
Southwest at 10-20 knots at all stations except RUT which will
remain at 05-08 knots.

Outlook 00z Tuesday through Friday...

00z Tue - 00z Wed: VFR trending to a mix of VFR/MVFR in scattered

00z Wed - 00z Sat: Mainly VFR with isolated MVFR cigs.


VT...Freeze Warning from 1 AM to 8 AM EDT Monday for VTZ003-004-007-
     Frost Advisory from 1 AM to 8 AM EDT Monday for VTZ002-005-006-
NY...Freeze Warning from 1 AM to 8 AM EDT Monday for NYZ026-027-
     Frost Advisory from 1 AM to 8 AM EDT Monday for NYZ028-035-087.


NEAR TERM...Banacos/Lahiff
AVIATION...Lahiff/MV is the U.S. government's official web portal to all federal, state and local government web resources and services.