Area Forecast Discussion
Issued by NWS Portland, ME-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
FXUS61 KGYX 220422
Area Forecast Discussion
National Weather Service Gray ME
1222 AM EDT Sat Apr 22 2017
A moist onshore flow will continue through tonight as a complex
area of low pressure over western New England moves slowly
eastward. We`ll see occasional light rain along with areas of
drizzle and fog. Some wet snow and sleet will remain possible
across the higher terrain near the international border. We`ll
continue to see cool unsettled weather on Saturday as low
pressure remains across the area. High pressure and drier air
will finally build into the region on Sunday. A cold front will
cross the region sunday night into Monday. Low pressure will
move up the Eastern Seaboard Tuesday and Wednesday.
.NEAR TERM /UNTIL 6 AM THIS MORNING/...
-- Changed Discussion --midnight... Rain is working on exiting the region with radar
just showing showers over the coast. Have decreased PoP in the
CT river valley but added patchy fog through morning as most
sites are reporting some fog in the wake of the rain.
1035 PM Update...
Minor changes to adjust where the highest and lowest chances for
precipitation are currently will be and over the next few
hours. Most of the activity will be moving into Maine for the
bulk of the overnight hours while showers come to an end in NH.
Clearing will reach southwest Maine by the daylight hours as
drier air works in...making its way towards Portland around the
morning commute time frame.
730 PM Update... Showers were moving across central and
southern NH as well as most of Maine this evening with light
accumulations of rain so far. Snow has begun to mix in near
Frenchville and Greenville Maine and this trend will grow with
areas near the Carrabassett Valley and other mountainous
locations seeing snow, sleet, and freezing rain at times.
Surface temperatures hover around the freezing mark in these
areas, and warmer air arrives around 3k feet later tonight which
will contribute to a warm nose noted on forecast soundings.
Reworked the PoP and weather grids to reflect latest mesoscale
guidance concerning the atmospheric temperature profile. This
resulted in much the same forecast with maybe a little more snow
for central Coos County. Maintained/added areas of fog and
drizzle as well.
At 18z...A broad area of low pressure extends from the eastern
Great Lakes through the mid atlantic region. Forecast area
remains in the moist onshore flow off the Gulf of Maine with
clouds and areas of light rain drizzle and fog. Little change
tonight with the cool damp conditions to linger. Along the
international border the higher terrain may see some light snow
or sleet accumulation as well. Lows tonight will range from the
mid 30s to lower 40s.
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.SHORT TERM /6 AM THIS MORNING THROUGH 6 PM SUNDAY/...
On Saturday...Maine and seacoast New Hampshire will remain in
the moist onshore flow for the balance of the day with clouds
and some areas of drizzle and fog along with a few showers. Over
the remainder of New Hampshire...an occluded front will move
slowly eastward with the somewhat drier but light westerly flow
helping to dry thinks out a bit during the afternoon hours.
Clearing finally arrives Saturday night as high pressure builds
into the area.
.LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/...
The extended portion of the forecast will start out on a good
note, with high pressure over the region Sunday while a weak
cold front approaches from the northwest. The result should be a
good amount of sun with temperatures well into the 50s if not
the 60s in some locations. The aforementioned cold front will
drop across the region Sunday night with little
fanfare...perhaps a period of bkn skies.
High pressure builds in on Monday as the cold front settles over
southern New England. The result should be a nice day - a good
amount of sunshine with temperatures in the 60s. The high
continues to nose in from the northeast Monday night and
Tuesday. However, things look to quickly change during the day
Tuesday as northern and southern stream short wave troughs team
up and move toward New England. As long as current model progs
are close to reality, we`re looking at rain developing from S to
N Tuesday which then continues into Wednesday. Better conditions
are possible Thursday and Friday as the system moves away, but
current indications are that a cool easterly SFC flow may remain
.AVIATION /06Z SATURDAY THROUGH WEDNESDAY/...
Short Term /through Saturday night/... IFR to LIFR will
continue into Saturday along the coast. Elsewhere...MVFR with
areas of IFR through Saturday morning in drizzle and fog.
Improving to VFR throughout Saturday night from west to east as
high pressure builds into the area.
Long Term...VFR conditions look likely Sunday, which should
continue through Monday night. Deteriorating conditions (MVFR to
IFR) are once again expected to develop by Tuesday afternoon and
last through Wednesday in rain/low clouds.
Short Term /through Saturday night/...We`ll continue with SCA
conditions tonight. On Saturday...we`ll likely see lingering SCA
seas outside the bays.
Long Term...SCA conditions will be possible Tuesday through
A moist air mass will remain through Saturday as onshore flow persists
with areas of drizzle and fog along with a few showers. Sunday will
be drier but humidity levels will remain moderate.
-- Changed Discussion --ME...None.
MARINE...Small Craft Advisory until 7 AM EDT this morning for
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