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-- Discussion containing changed information from previous version are highlighted. --
000
FXUS61 KCAR 161429
AFDCAR

Area Forecast Discussion
National Weather Service Caribou ME
1029 AM EDT Tue Apr 16 2024

.SYNOPSIS...
High pressure builds southward from Canada through Thursday
night. The high then slowly slides to the east, while a frontal
system gradually approaches from the west Friday, then crosses
the area Saturday. High pressure returns to the area Sunday into
Monday.
&&

.NEAR TERM /THROUGH TONIGHT/...
-- Changed Discussion --
Update...
Upper level low pressure will remain north of Maine today. A
disturbance rotating around the low is currently exiting across
the Maritimes. Another disturbance rotating around the upper
low will then cross the region this afternoon. Expect mostly
cloudy skies along with isolated rain showers across northern
and central areas through the afternoon. Expect partly
sunny/mostly cloudy skies Downeast through the afternoon.
Northwest winds will gust up to 25 to 30 mph today. High
temperatures will range from the mid to upper 40s north, to the
mid to upper 50s Downeast. Have updated to adjust for current
conditions along with expected afternoon temperatures, clouds
and shower chances.

Previous Discussion...
Showers and cloud cover will quickly dissipate this evening as
high pressure returns to the area behind the weak cold front. As
winds dissipate into the overnight hours, some surface
decoupling is possible to allow for full radiational cooling,
and temperatures may dip into the upper 20s to around 30 across
the north and down to around freezing Downeast.
-- End Changed Discussion --
&&

.SHORT TERM /WEDNESDAY THROUGH THURSDAY NIGHT/...
High pressure builds at the surface and aloft through the
period. A northerly low level flow and 850mb moisture makes
thin cumulus fields likely for much of the area on Wednesday.
Given the very dry Canadian air mass and deep mixing expected,
did reduce dew points below guidance and raise high temps above
guidance. The same applies for Thursday, but expect less cloud
cover with increasing subsidence. Temperatures will be a bit
warmer Thursday except at the coast where the afternoon sea
breeze will develop. Decent radiational cooling will occur both
Wednesday and Thursday nights with lows dropping into the upper
20s to lower 30s.
&&

.LONG TERM /FRIDAY THROUGH MONDAY/...
Trended towards less clouds and PoPs on Friday as the high
remains anchored over the area. This also prompted an upward
trend in the high temp forecast on Friday. The ridge finally
breaks down Friday night and a weakening occlusion moves through
the area Friday night. There is not an impressive draw of
moisture or lift with the front. Dynamics are slightly better
for Downeast by late Friday night into Saturday morning and that
area may receive a few tenths of an inch of rainfall. The
occlusion exits Saturday morning and the trailing cold front
arrives in the afternoon. The lag between the two features
should enable highs to climb into the upper 50s across most of
the area...except Downeast where clouds and rain linger much of
the day.

An rapidly weakening upper trough arrives later Saturday
afternoon and will create some instability with decent mid-level
lapse rates possible, but timing is a bit late in the day and
moisture appears to be lacking. Expect some showers in the North
Woods, but that should quickly diminish Saturday evening.

Clearing and high pressure returns Saturday night into Monday
with another round of cool and very dry Canadian high pressure.
Once again, the challenge becomes the impact of a very deep
mixed layer on high temps and dew points for Sunday and Monday.
Highs will be in the 50s with a few readings over 60F possible
by Monday.
&&

.AVIATION /14Z TUESDAY THROUGH SATURDAY/...
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NEAR TERM: VFR/MVFR across northern and central areas today with
isolated showers. VFR Downeast today. VFR regionwide tonight. An
isolated rain shower possible across northern and central areas
early tonight. Northwest/west winds 10 to 15 knots with gusts
up to 20 to 25 knots today. Northwest winds 10 to 15 knots
tonight.

SHORT TERM:
Wednesday into Friday...VFR with excellent vis and cigs
generally above Fl050. North winds 10 to 15 kt on Wednesday
shifting to light and variable Thursday, and then southerly 10
to 15 kt by Friday afternoon.

Friday night into Saturday...MVFR tempo IFR due to cigs and
showers. South winds becoming southwesterly 5 to 15 kt.
-- End Changed Discussion --
&&

.MARINE...
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NEAR TERM: Winds/seas below small craft advisory levels today
through tonight.

SHORT TERM: No significant weather is expected in terms of fog,
winds or seas. There is a chance of SCA conditions on Saturday,
but stability will probably prevent too many gusts to 25 kt.
-- End Changed Discussion --
&&

.CAR WATCHES/WARNINGS/ADVISORIES...
ME...None.
MARINE...None.

&&

$$


Near Term...Norcross/AStrauser
Short Term...MCW
Long Term...MCW
Aviation...Norcross/MCW
Marine...Norcross/MCW