Area Forecast Discussion
Issued by NWS Portland, ME

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FXUS61 KGYX 231026

Area Forecast Discussion
National Weather Service Gray ME
626 AM EDT Tue May 23 2017

Weak high pressure will build south of the region today and will
hold over the region tonight and Wednesday as low pressure
passes well offshore. A complex area of low pressure will
approach from the southwest Wednesday night and Thursday and
will slowly move northeast through southern New England and the
Gulf of Maine Thursday night and Friday. High pressure will
build in from the west Friday night and Saturday. A cold front
will drop south through the region Saturday night and Sunday.


625 AM Update...Low clouds and fog will burn off early this
morning allowing the sunshine to return. No changes to the
forecast at this time.

Low pressure will depart off to the east early on today. As a
westerly flow develops early on this morning, the low clouds,
fog, and drizzle will be shunted offshore. The result should be
a partly sunny day with highs in the 70s at most locations with
light winds.


As a short wave trough amplifies over the lower OH valley
tonight and Wednesday, deep layer ridging will develop over New
England. This should allow for another nice day on Wednesday as
low pressure passes well to our south. It may be a bit more
cloudy, but highs should reach into the 70s once again.


High pressure will hang on through Wednesday night as low pressure
over the Ohio Valley slowly begins to lift northeast. After a
partly cloudy evening expect high and mid level clouds to over-
spread the region from the west. Low temps will range from the
mid 40s north to the mid 50s south.

Complex area of low pressure will continue to lift toward New
England on Thursday. Best forcing remains south of the region
through the day along a developing warm front. Will likely stay
close to SB numbers for pops but expect any showers to be light
and spotty. Increasing onshore flow will likely bring ocean
stratus into the picture in southern zones during the afternoon
and  evening. High temps away from the coast should reach the
mid to upper 60s with upper 50s to lower 60s along the coast.

Low pressure becomes vertically stacked south of New England
Thursday evening and will slowly drift northeast overnight.
Looking for occasional periods of rain overnight but nothing
too heavy. QPF will only amount to a quarter inch or less
through daybreak Friday. Lows overnight will be fairly uniform
across the forecast area with most locations bottoming in the
lower to mid 50s.

Low pressure will move northeast through the Gulf of Maine and
into the Maritimes on Friday. Looking for rain for much of the
day before precipitation tapers to showers late Friday afternoon.
Models in fairly good agreement on QPF with most areas picking
up a  a half to 1 inch of accumulation with some higher amounts
in mid coast Maine. Highs on Friday will once again range through
the 60s with coolest readings along the coast.

Low pressure will pull away from the region Friday night as a
shallow surface ridge builds in from the west. Looking for
clearing skies during the evening hours. Lows overnight will
range from the mid 40s north to the lower 50s south.

High pressure will build south of the region on Saturday bringing
a mix of sun and clouds to southern and central zones. A backdoor
cold front settling into northern Maine will bring increasing
clouds and a chance of afternoon showers to northern zones. Highs
on Saturday will range from the mid 60s to lower 70s.

Backdoor front will continue to settle south Saturday night and
Sunday. After a chance of evening showers in the north...not
looking for much more than variable clouds overnight. Lows will
range through the 40s north and lower to mid 50s south.

Frontal boundary will stall over southern New England on Sunday
as high pressure builds south from Canada. This boundary may be
the focus for clouds and afternoon showers in southern New
Hampshire and southwest Maine as an onshore flow increases north
of the front. Expect highs in the 60s to near 70 but dropping
back into the lower 60s along the coast in the afternoon.


Short Term...IFR conditions early this morning should improve to
VFR by around 13z. These VFR conditions should continue for most
terminals through Wednesday.

Long Term...
VFR Wednesday night and Thursday. IFR/LIFR ceilings and vsby
Thursday night and Friday...improving to VFR Friday night. VFR


Short Term...Conditions should remain below SCA thresholds today
through Wednesday.

Long Term...
SCA`s may be needed Thursday night through Friday.


Warmer and drier weather is expected today and Wednesday with RH
values generally in the 40s. Renewed chances for rain will
arrive for Thursday and Friday.


Highest astronomical tides of the season will likely result in
some minor coastal flooding at the time of High tide Thursday
night and again on Friday night.




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