Area Forecast Discussion
Issued by NWS Caribou, ME

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FXUS61 KCAR 131420

Area Forecast Discussion
National Weather Service Caribou ME
920 AM EST Wed Dec 13 2017

Low pressure will move to the Gulf of Saint Lawrence today. A
ridge of higher pressure will build into the area this
afternoon, and will remain over the area until the next system
moves into Maine on Friday.


9 AM Update...Snow in western areas and a mix of snow and rain
in the east is quickly lifting north. Just some scattered snow
showers remain behind the area of precipitation. Much colder air
is expected to quickly rushin behind the departing precipitation
through midday and this afternoon causing any remaining water
and slush to freeze into ice. Adjusted back end of the
precipitation to lift it north through midday. Also raised temps
in the northeast and lowered temps in central areas. Otherwise,
no major changes this hour.

Previous discussion...
A deep area of low pressure along the Washington County coast
early this morning will continue to deepen and lift north today.
The low is expected to be in western Labrador late tonight. As
the low lifts north today a strong cold front will sweep across
the area with the cold air filtering in rapidly from the
southwest. There will still be a mild air mass aloft across far
eastern Maine at 12Z with 925H temps well above freezing along
and near the Maine/New Brunswick border all the way north to the
Saint John Valley. As of 3 am, it is raining at Caribou and the
temperature is up to 35F. Very little in the way of precipitation
falling across the Bangor Region and across Downeast area early
this morning. Temperatures range from around 50F along the
Washington County coast to the low 30s in the Bangor area. Plan
to cancel the winter weather advisories and warnings with the
exception of zones 1, 3, 4, and 10. This is not to say that
there will not be slick spots where there was already freezing
rain and snow, but with little in the way of additional new snow
or ice this morning it does not warrant keeping the headlines
going. Across the northeast zones, mostly rain early this
morning that will transition to snow showers by late morning.
The deformation zone associated with the low sets up mainly to
the west of the area in Quebec, so not sure that there will even
be much in the way of steady snowfall falling this afternoon
across the western zones, but some snow showers and gusty wind
along with patchy blowing snow is likely across the north and
mountains this afternoon.  It is possible that the warnings in
the west will be able to be cancelled early, but will let the
day shift get a look at just where the deformation zone sets up
during the day. A quick inch or two of snow may accumulate in
some spots in the north and mountains this afternoon into this
evening. As the low lifts north tonight it will remain cloudy
across the north and mountains with a few snow showers and some
blowing snow. Partly cloudy Downeast. Any standing water on
untreated surfaces will freeze. Temperatures by morning will be
in the single digits north to the teens along the coast, with
wind chills below zero.


The model guidance is in good agreement through the short term
period of the forecast. An upper level low over eastern Quebec
will influence the weather for the area through much of the
period. The low over eastern Quebec will slowly move NE towards
the Maritimes Thursday. Another low pressure system will move
into the north Atlantic near the NJ coast and will remain south
of the Gulf of Maine waters exiting the region Thursday
afternoon. Higher pressure will build into Southern Maine. By
early Friday morning the low over Quebec will move into the
Maritimes, and higher pressure will build into northern Maine.
Another low and frontal system will move through the Great Lakes
region, reaching western Maine by the end of the period.

Loaded a blend of the GFS/NAM/ECMWF to smooth out the minor
differences in the models. Loaded NAWAVE4 for seas in the
coastal waters. Loaded windgust by factor tool. For QPF used


The extended models are in good general agreement at the start
of the period. The extended models continue to indicate that
they weather through the period will be influenced by an upper
level low over Northern Quebec. It will spin up clipper system
on a 12 to 18hr interval. No significant storms through the

Loaded a blend to smooth out the differences in the models,
however the solution leans more towards the GFS solution. Used
NAWAVE4 for seas in the coastal waters. Used windgust by factor


NEAR TERM: IFR and at times LIFR at the northern terminals will
improve to MVFR this evening, but occasional IFR or LIFR will remain
possible at times tonight in passing  snow showers.  LIFR to IFR at
KBGR and KBHB will improve to MVFR this morning and to VFR by late
in the day.

SHORT TERM: MVFR conditions across northern Maine with scattered
snowshowers. VFR conditions for Southeastern Maine. VFR
condition will extend into northern Maine Thursday afternoon as
higher pressure ridges in. VFR conditions will remain into
Friday evening, a frontal system moving into western Maine
Friday will displace the high pressure ridge. Ceilings will
begin falling in the afternoon Friday. MVFR conditions BHB and
BGR early evening, spreading to other sites by midnight. IFR
conditions at BHB and BGR early AM Saturday. Everywhere by
morning in snow and snowshowers. The frontal system and
associated low will clear the area Saturday evening, clearing
VFR conditions return to all sites by late Saturday afternoon.
VFR conditions will continue thru the day Sunday, MVFR in
snowshowers Sunday evening as the next system moves in.


NEAR TERM: A gale warning is in effect from late this afternoon
through tonight as a strong area of low pressure lifts well to
the north of the waters and a strong pressure gradient continues
across the area.

SHORT TERM: A SCA for winds and seas transitioning to an SCA for
seas on Friday may be required.


ME...Winter Storm Warning until 7 PM EST this evening for MEZ001-
MARINE...Gale Warning from 4 PM this afternoon to 4 AM EST Thursday for



Near Term...CB/MCB
Short Term...Norton
Long Term...Norton
Marine...CB/Norton is the U.S. government's official web portal to all federal, state and local government web resources and services.