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Area Forecast Discussion (AFD)

Issued by Gray - Portland, ME (GYX)

FXUS61 KGYX 280748

Area Forecast Discussion
National Weather Service Gray ME
348 AM EDT Mon May 28 2018

High pressure over the maritimes drifts east today. A frontal
system will approach the region later today and move through the
area tonight producing scattered showers in the mountains and
foothills. High pressure will build over the region Tuesday
through Thursday. The remnants of Alberto may bring appreciable
rainfall to the region Friday into the weekend.


High pres over the maritimes will continue a weak onshore flow
today producing cool and cloudy conditions. By later in the day
scattered showers may develop in the mountains and foothills
ahead of an approaching frontal system from the west. Temps will
once again be cool today, especially near the coast. Highs will
range from the mid to upper 50s along the coastal plain to 60s
to lower 70s well inland.   


A frontal system moves thru the region tonight producing
scattered showers in the mountains and foothills. Winds will
shift to the northwest behind the front late with much drier 
air toward morning allowing skies to clear from west to east. 
Tuesday looks to be sunny and much warmer as high pres builds 
into the region. Highs Tue will range from the mid 70s to mid


An area of high pressure will begin to build into northern New
England Tuesday night from Canada in somewhat of a backdoor
fashion. The upper level ridge will gradually shift east and
into the Atlantic thereafter. This will allow a moist, southerly
flow to develop by Thursday. An increase in moisture and
instability will lift into the northern latitudes bringing 
scattered showers to southwester portions the region. There 
will also be an increase in fog, esecially at night and 
especially near the shoreline.

By Thursday, H8 temperatures will approach the +14 to +16 range.
This will allow for widespread 80s across the interior. With a
southerly fetch off the Gulf of Maine, expect cooler
temperatures, in the 70s along the coastline. Fog may be
problematic during this period due to the much colder marine 

An upper level trough and possibly moisture from the remains of
Alberto will lift north on Friday. On Saturday, showers are
expected with instability values sufficient enough to produce
scattered thunderstorms over western New Hampshire.

Showers will linger into Sunday with yet another backdoor high 
pressure system building into the region Sunday night. A moist
northeast flow may allow for a shower or two as we begin the
next work week.


Short Term /through Monday night/...MVFR to IFR conditions
through this morning but then improving to VFR throughout btw 
15 and 18z with sct MVFR aft 20z in mtn -shra. Conditions become
VFR all areas by later tonight through Tue. 

Long Term...Mainly VFR conditions on Wednesday and into
Thursday. An increase in moisture will allow for patchy fog 
along with scattered showers and thunderstorms late in the week 
and into the weekend. This will produce periods of MVFR or IFR 
conditions, especially near and along the coastline. 


Short Term /through Tuesday/...Seas over the outer waters will
continue near 5 ft into this morning so extended the SCA for a
few more hours until 8 am. By mid morning winds and seas will 
subside below SCA conditions and continue light through Tue.

Long Term...Conditions are expected to remain below SCA
thresholds Wednesday through next weekend.


Moist onshore flow will continue today. The rest of the week 
looks warm, with light winds, and moderate humidity.


MARINE...Small Craft Advisory until 8 AM EDT this morning for ANZ150-