Area Forecast Discussion
Issued by NWS Portland, ME

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FXUS61 KGYX 271942 CCA
AFDGYX

Area Forecast Discussion...Corrected
National Weather Service Gray ME
342 PM EDT Sun May 27 2018

.SYNOPSIS...
High pressure over the maritimes will retreat well offshore
tonight. Weak low pressure passing to our south tonight and
early Monday will spread clouds across the entire forecast area.
Any showers with this disturbance should be spotty and largely
confined to far southern New Hampshire and the southern tip of
Maine. Another low will pass to our north on Monday with a
trailing cold front to cross the region Monday night preceded by
a few showers across the mountains and foothills. High pressure
will build over the region Tuesday and will push offshore south
of New England Wednesday. Low pressure may bring appreciable
rainfall to the region Friday into next weekend.

&&

.NEAR TERM /THROUGH TONIGHT/...
At 18z...a 1028 millibar high was over Nova Scotia. A wavy
frontal boundary extended from south of Long Island through the
DELMARVA region. GOES imagery showed the cloud shield ahead of
a weak impulse and associated surface wave overspreading the
remainder of the forecast area at the moment. An area of showers
across western New England were creeping eastward and will graze
southern and western sections of the forecast area through early
tonight. Onshore flow between the retreating maritimes high and the
disturbance to our south will complicate matters as it may produce
some low clouds and patchy fog for coastal and southern areas
overnight.

&&

.SHORT TERM /MONDAY and MONDAY NIGHT/...
Slow improvement Monday as clouds decrease from west to east
behind the departing disturbance and the flow becomes more
southerly. There may be some lingering low clouds east and north of
Casco Bay until early afternoon as the trajectory remains onshore.
Otherwise...becoming partly sunny by afternoon with highs ranging
from around 60 on the coast...to around 70 inland. Low pressure will
be passing by to our north across Quebec Province late tomorrow and
tomorrow night with the trailing frontal system producing a few
showers across northern and mountains sections. Those showers will
quickly end tomorrow night as high pressure builds in from the
northwest.

&&

.LONG TERM /TUESDAY THROUGH SUNDAY/...
A cold front will be departing offshore Tuesday morning. High
pressure moves in during the day on Tuesday and moves across the
region Wednesday. On Tuesday, despite the morning cold frontal
passage we`ll still warm up well into the 70s and 80s across the
region. High pressure will settle across the forecast area
Tuesday night. With light winds and dry air in place, we should
see good radiational cooling. Some of the best radiators in
northern NH will likely see lows in the 30s Tuesday night. Frost
advisory not completely out of the question. High pressure
slides offshore on Wednesday allowing for moistening return
flow. This will likely keep the coast cooler on Wednesday.
However, it will remain dry. The remnants of Alberto approach
Tuesday and may bring some beneficial rains to the region
Thursday night through Saturday. However, early indications are
that this period will not be a washout. It`ll feel more
summery/tropical though with dewpoints likely getting well into
the 60s with showers and thunderstorms from time to time.

&&

.AVIATION /18Z SUNDAY THROUGH FRIDAY/...
Short Term /through Monday night/...VFR gives way to MVFR
tonight in cigs with lcl IFR in -dz and fog and sct -shra. On
Monday...improving to VFR throughout btw 15 and 18z with sct
MVFR aft 20z in mtn -shra.

Long Term...VFR conditions expected Tuesday through Thursday.
Could see lower conditions develop Thu night and Fri with
increased tropical moisture expected.

&&

.MARINE...
Short Term /through Monday Night/...Marginal SCA winds gusts
continue through early evening otherwise SCA seas for the
balance of the night into the day Monday. I`ve extended the SCA
through late tonight and expect it`ll be extended into the day
on Monday for hazardous seas.

Long Term...Conditions are expected to remain below SCA
thresholds Tuesday through Saturday.

&&

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

&&

.GYX WATCHES/WARNINGS/ADVISORIES...
ME...None.
NH...None.
MARINE...Small Craft Advisory until 6 AM EDT Monday for ANZ150-152-154.

&&

$$
NEAR TERM...Schwibs
SHORT TERM...Schwibs
LONG TERM...Ekster



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