Area Forecast Discussion
Issued by NWS Caribou, ME

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FXUS61 KCAR 200747
AFDCAR

Area Forecast Discussion
National Weather Service Caribou ME
347 AM EDT Sun Aug 20 2017

.SYNOPSIS...
High pressure will build to the south of the area today and
Monday. Low pressure will pass to the west of the region Tuesday
night and a cold front will cross the area Wednesday. High
pressure will build back toward the area at the end of the week.

&&

.NEAR TERM /THROUGH TONIGHT/...
An occluded front crossing the region early this morning will push
east.  High pressure will build south of the region later today and
tonight.  A mid level trough axis will move into western Maine this
morning and will flatten out as it shifts east of the area by this
afternoon.  The forecast area is blanketed by low stratus and areas
of fog early this morning, although there are a few breaks in
the clouds in central portions of the CWA. The low clouds will
lift this morning as westerly flow develops. As the mid level
trough crosses the area the combination of the residual
moisture, daytime heating, and lift will likely produce some
more scattered showers later this morning into the first half of
the afternoon, mainly across northern and eastern portions of
the CWA. It should turn into a nice afternoon by late in the day
with at least partial sunshine and lowering humidity. There will
be very steep lapse rates from 8-10C/KM below 800H which will
lead to a gusty west wind that will gust to 20 to 30 mph at
times from later this morning until shortly before sunset. Highs
this afternoon will be about 10 degrees (F) warmer than
Saturday with highs ranging from the mid 70s in the Saint John
Valley to the low 80s in the Greater Bangor Region. Tonight
will be clear to p/cloudy, and as the atmosphere rapidly
decouples toward sunset the wind will become light. The air mass
aloft is quite mild and this will limit the potential cooling
with lows mostly in the 50s.

&&

.SHORT TERM /MONDAY THROUGH TUESDAY/...
Very warm and increasingly humid weather can be expected to
start the work week as an area of high pressure builds across to
our south. Temperatures at H925 warm to about +22C during Monday
across portions of the region with mostly sunny skies expected.
Highs will range from the low to mid 80s across much of the
region, which is several degrees above normal for this time of
year. A cold front will approach from the northwest Monday night
with partly to mostly cloudy skies across northern areas and
the chance for late night showers. Across central and down east
expect mainly clear to partly cloudy skies. Lows Monday night
will be well above normal, with lows expected to generally range
from the low to mid 60s across the region. The front will stall
across far northern areas Tuesday as an area of low pressure
tracks northeast across Quebec province. The combination of the
stalled frontal boundary in the vicinity of northern Maine and
low pressure to our northwest will result in increasing chances
for showers and thunderstorms during Tuesday, especially across
northern areas. An increasingly moist air mass is expected to be
in place with dew points in the low to mid 60s and precipitable
water values expected to increase to greater than 1.50" which could
lead to the possibility of locally heavy rainfall later Tuesday
afternoon across northern areas, especially in any
thunderstorms. Highs on Tuesday will again be above normal for
this time of year, with highs expected to range from the mid to
upper 70s north and low to mid 80s down east.

&&

.LONG TERM /TUESDAY NIGHT THROUGH SATURDAY/...
Low pressure will continue to track to our north Tuesday night
with a warm front lifting up across the region to our north. The
chance for showers and thunderstorms will continue overnight
Tuesday, as a warm and humid air mass remains in place across
the region ahead of an approaching cold front from the west. The
cold front is expected to cross northern areas Wednesday morning
and reach the down east coast later Wednesday afternoon. Expect
a continued chance for showers with the passage of the front. A
large area of high pressure will then begin to build east toward
the region Wednesday night through Saturday, with a much cooler
and drier air mass spreading across the region for mid week into
next weekend. With an upper trof remaining to our north couldn`t
rule out an isolated shower across northern areas through late
week, otherwise expect mainly dry weather through the period
with temperatures expected to below normal by late week and
into next weekend.

&&

.AVIATION /08Z SUNDAY THROUGH THURSDAY/...
NEAR TERM: LIFR to IFR ceilings early this morning will lift to VFR
by 13z to 15Z. VFR expected from 15Z this morning through 12Z Monday
morning.

SHORT TERM: VFR conditions can be expected Monday and Monday
night. Showers and thunderstorms can be expected Tuesday
afternoon, especially at the northern terminals, with the
potential for sub VFR conditions at times. Expect MVFR
conditions Tuesday night in showers and thunderstorms, along
with patchy fog. Showers can be expected into Wednesday with
mainly VFR expected. VFR expected on Thursday.

&&

.MARINE...
NEAR TERM: The wind and seas will remain below small craft advisory
levels through tonight.  Areas of fog will produce poor visibility
early this morning.

SHORT TERM: Winds/seas are expected to remain below small craft
advisory levels Monday into Tuesday. Winds/seas may could
increase to small craft advisory levels by Tuesday night and
Wednesday. Visibility will likely be reduced to 1 to 3 nm
Tuesday night in showers and thunderstorms, along with patchy
fog.

&&

.CAR WATCHES/WARNINGS/ADVISORIES...
ME...Beach Hazards Statement from 8 AM EDT this morning through
     this evening for MEZ029-030.
MARINE...None.

&&

$$

Near Term...CB
Short Term...Duda
Long Term...Duda
Aviation...CB/Duda
Marine...CB/Duda


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