Area Forecast Discussion
National Weather Service Burlington VT
732 AM EDT Thu Mar 16 2023
.SYNOPSIS...
A weak upper disturbance will bring some additional light snow and
rain showers today.
Another storm system arrives on Friday, bringing
another round of valley rain and wet mountain snow to the region
through Friday night. A cool and breezy weekend is expected as a
broad low sets up to north, and allows for some lake effect showers
for Saturday and Sunday. Generally drier weather should develop for
the new week, along with seasonal temperatures in the 40s during the
day and teens to 20s at night.
&&
.NEAR TERM /THROUGH FRIDAY/...
As of 558 AM EDT Thursday...Have issued a quick update this
morning to increase
PoPs across the St Lawrence Valley. Snow has
arrived a bit earlier than previously anticipated, with KMSS
reporting light flurries, and some of the NY
mesonet cams
showing a few flakes. There will
likely be a bit of a break once
this first batch of showers moves through, with the bulk of the
activity to arrive later this morning into the afternoon. Have
also increased cloud cover from the Champlain Valley westward.
Otherwise, the forecast is in good shape and no other changes
were needed this morning.
Previous discussion...Ridging will remain centered south of our
region today, giving us a dry start this morning. However, a weak
upper disturbance and increased
moisture will
crest over the
ridge
axis later this morning and cross directly overhead by this
afternoon. The result will be light showers, particularly across
northern sections. Although temperatures will be above freezing,
lower dewpoints will allow for evaporational cooling, so expect the
bulk of the precipitation to fall as snow, especially in the higher
elevations. Regardless, any showers will be light in nature and any
snow accumulation will be minimal, an inch or so at most. Highs will
top out in the mid 30s to mid 40s.
The
ridge axis shifts eastward and across our area overnight
tonight, so any showers will taper to an end this evening. The bulk
of the overnight will be dry, though precipitation chances will
begin to increase late tonight/early Friday ahead of our next
system. Lows will mainly be in the mid 20s to around 30.
More widespread precipitation is expected on
Friday as low pressure
lifts northeastward from the Great Lakes up to the west of the St
Lawrence Valley. Increasing south/southwest
flow between this
feature and the
ridge departing to our east will usher in plentiful
moisture (PWATs will approach 1 inch) along with warmer
temperatures.
So while precipitation will likely start out as snow,
especially over the higher terrain, expect just about all locations
excepting the highest summits will transition to rain during the
afternoon hours as highs reach into the 40s. Daytime rainfall
amounts will generally be a quarter of an inch or less, with any
snowfall accumulations less than a half inch.
&&
.SHORT TERM /FRIDAY NIGHT THROUGH SATURDAY/...
As of 404 AM EDT Thursday...
Low pressure system will lift from the
northern Great Lakes northeastward into Quebec Providence Friday
night into Saturday.
Rain showers will continue throughout Friday
night before the cold front passes and showers change over to snow,
first in the higher elevations and the valleys, mainly East of the
Greens, Saturday morning. Overall,
QPF should be minimal, 0.10" or
less with snowfall of 2" or less.
Winds will be gusty, mainly across
the St, Lawrence Valley and the International Border under
southwesterly flow, with that, some lake effect snow across the
southern half of that valley is not out of the question during the
day Saturday. Friday night will see overnight lows in the low 30s to
mid 20s and day time highs on Saturday in the lower 40s to 30s.
&&
.LONG TERM /SATURDAY NIGHT THROUGH WEDNESDAY/...
As of 404 AM EDT Thursday...
Lingering upper level trough and cold
pool aloft will slide into our region on Saturday night and
especially Sunday, leading to a pretty cool second half of the
weekend for our region. while dry across most of the region, brisk
southwesterly flow will continue and with that chances for lake
effect snow will continue Saturday night and into Sunday before the
band shifts south by Sunday evening.
Past this point, a large
ridge of high pressure settles into the
region giving us
an extended period of quiet, dry weather that
looks to extend to at least the middle of next week.