FXUS61 KBTV 250512
Area Forecast Discussion
National Weather Service Burlington VT
112 AM EDT Sat Mar 25 2023
Cool and dry weather will persist through tonight as high pressure
briefly crosses the region. Then a strong low pressure system passes
to our northwest this weekend, bringing a round of wintry mixed
precipitation to the region. Some light snow and ice accumulations
are possible, with highest amounts in the higher elevations. After
lingering showers on Sunday, we turn towards drier weather early
.NEAR TERM /THROUGH SUNDAY/...
As of 1015 PM EDT Friday...Another quiet weather update tonight
with minimal changes to the forecast as high pressure dominates.
Everything seems to be on track for a dry night with clear
skies largely dominating in the wider valleys as temperatures
fall into the 30s and then 20s, teens in the colder spots like
the Adirondacks and Northeast Kingdom with light and variable
winds. Still continuing to monitor the next storm system,
arriving tomorrow with the potential to bring snow, rain, and a
wintry mix of sleet and freezing rain. More on that in the
previous discussion below:
Previous discussion...A mix of snow, sleet, freezing rain, and
rain will move in Saturday afternoon, linger into Saturday
evening, before transitioning to mainly an elevational rain/snow
scenario by early Sunday. Snow/sleet amounts will range from a
dusting in the wider valleys to 2-3 inches in the higher
terrain, with most areas seeing only a glaze of ice, if that.
Read on for details.
Ridging will crest over the North Country tonight and move east
Saturday morning. We`re already seeing clearing for areas except the
northern Greens and Northeast Kingdom, and expect clouds will
continue to dissipate as we lose daytime heating this evening. The
northern higher terrain will hold onto the cloud cover longest, but
do expect most areas will see at least partly clear skies overnight.
This with light winds and drying dewpoints will lead to a chilly
night; lows will drop into the lower to mid teens in the Adirondacks
and Northeast Kingdom, while elsewhere will be in the lower to mid
Again, overall expectations for Saturday and Saturday night remain
the same, with low pressure to lift northward through the Great
Lakes tomorrow to just west of the St Lawrence Valley Saturday
night. While it`ll take a while for precipitation to reach the
ground given the dry air in place, with favorable frontogenetical
forcing and a strong southeast 850mb jet, we should see a pretty
good swath of precipitation overspread the region from southwest to
northeast during the afternoon. Although temperatures will be in the
lower/mid 30s, expect locations that start out as rain will see at
least a time of snow as wet bulbing occurs. One change of note is a
brief dry slot is expected to move in behind this initial band,
turning steadier precipitation to more showery in nature. Warming
aloft will occur during this time as well, so after initial
rain/snow, expect sleet and freezing rain to mix in with the more
showery conditions, especially after 2-4 pm or so, first in the
Adirondacks/southern St Lawrence Valley and later in eastern VT
(which could stay rain/snow as late as 4-6 pm). Temperatures should
recover back into the mid 30s most spots, so valley locations could
change back to primarily rain during the evening, occasionally
mixing with sleet or snow. And temperatures shouldn`t fall much even
after dark, so this should hold true after sunset. Higher elevations
have the better potential for seeing the wintry mix, and it is here
that the highest snow and ice amounts are expected. Precipitation
will begin to fill back in in the evening from west to east as a
secondary low develops off the East Coast and colder air starts to
spill back into the area. This colder air will erode the warm nose
aloft, so there will be a gradual change from the wintry mix to more
of an elevational dependent pure rain/snow event. This should occur
starting roughly around midnight in the St Lawrence Valley to
sunrise Sunday in eastern Vermont.
The other concern for this event will be gusty winds. First will the
the southeast winds Saturday afternoon. With the dry slot moving in,
this will allow for more mixing once the steady precipitation exits.
With a 55+ kt 850 mb jet, expect gusts of 25 to 35 mph, with the
favored western slopes of the Adirondacks/Greens seeing localized
gusts around 40 mph. Gusts will subside a bit as the secondary area
of precipitation moves in during the evening, but winds turn to the
southwest as cooling occurs and lapse rates steepen, once again
allowing gusts of 25-35 mph. This time the St Lawrence Valley and
northeastern sides of the higher terrain have the best potential for
.SHORT TERM /SUNDAY NIGHT/...
As of 342 PM EDT Friday...Showers will linger around on Sunday as the
low continues to track outside of our region. Precipitation will
taper off by Sunday evening as weak high pressure starts to build
in. Strong 850mb winds and good mixing will create very windy
conditions on Sunday, with the strongest gusts in the Adirondacks
and St. Lawrence Valley. Will generally be out of the west for most
of the day. Temperatures will be fairly seasonable, with high
temperatures in mid 30s to mid 40s during the day.
.LONG TERM /MONDAY THROUGH FRIDAY/...
As of 342 PM EDT Friday...Next week starts out very quiet Monday into
Tuesday as weak high pressure builds in. Upper flow will be fairly
zonal across the CONUS during this time frame, but there is
potential for a mid-week system. Models have been in disagreement,
both model to model and run to run, regarding the outcomes for a
potential mid-week system. Some ensemble members, as well as a some
of the deterministic global guidance, suggest a storm system
sometime in the Tuesday/Wednesday timeframe. Given the amount of
uncertainty for most of the extended, there is currently only
chance PoPs in the forecast. There is still plenty of time for
the models to come into better consensus and the details to be
figured out, so stay tuned. Temperatures continue to be fairly
seasonable next week. Daytime high temperatures in mid 30s to
mid 40s and overnight lows in the 20s, which is perfect for
maple sugaring season.
.AVIATION /05Z SATURDAY THROUGH WEDNESDAY/...
Through 00Z Sunday...VFR conds through 16-18Z time frame as thin
high clouds gradually thicken and lower in advance of a warm
front approaching from the southwest. This front and associated
precipitation will affect the region thereafter. Precipitation
will mainly fall as a quick 1-3 hour burst of IFR light snows,
mainly in the 16-23Z time frame south to north, after which it
tends to become more scattered with some mixed light rains
possible in valley locales such as BTV. After steadier
precipitation abates and through the end of the TAF cycle,
gusty east/southeast winds from 20-35 kts develop with wind
shear to 45-55kt at selected terminals. This will likely lead to
enhanced mechanical turbulence on approaches/departures.
Sunday: Mainly VFR, with areas MVFR possible. Chance SHRA, Chance
Sunday Night: Mainly VFR, with local MVFR possible. NO SIG WX.
Monday: Mainly VFR, with local MVFR possible. NO SIG WX.
Monday Night: VFR. Slight chance SHSN.
Tuesday: VFR. Chance SHRA, Slight chance SHSN.
Tuesday Night: Chance SHSN.
Wednesday: Chance SHSN, Slight chance SHRA.