Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 180431 AFDGYX Area Forecast Discussion National Weather Service Gray ME 1231 AM EDT Wed Oct 18 2017 .SYNOPSIS... High pressure will hold south of New England tonight through Wednesday. A cold front will approach from the west on Thursday and will move east through the region Thursday night. High pressure will build in from the west on Friday and will crest over the area on Saturday before shifting east. High pressure will hold off the coast Sunday through Monday as a cold front slowly approaches from the west. The cold front will stall over the region monday night and Tuesday. && .NEAR TERM /UNTIL 6 AM THIS MORNING/...
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1230 am update: Input latest obs data suggesting only very minor tweaks to temps and dew points as they continue to fall. Very quiet cool evening with no other changes for the overnight period with the exception of clouds hanging tough in the north. Previous Discussion: The center of surface high pressure will continue to move south of New England tonight allowing weak warm air advection to develop in its wake. The result will be an increase in clouds tonight, mainly in the Northern NH and Western ME mountains. Otherwise, a nice night for most and not as cold as last night.
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&& .SHORT TERM /6 AM THIS MORNING THROUGH 6 PM THURSDAY/... Deep layer ridging will be the story on Wednesday with a light southwesterly flow at the surface. The result will be sunny skies and temperatures a good 10-15 degrees higher than Tuesday`s values. It will be warmer still Wednesday night in the continuing warm air advection regime. Some valley fog possible late at night, but otherwise it looks clear. && .LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/... High pressure will hold south of New England on Thursday as a weak front approaches from the west. Expect mostly sunny skies through the day with highs from the mid 60s to lower 70s. Moisture starved front will cross the region Thursday night with little if any fanfare. Best dynamics with associated shortwave remain well north of the region so only looking for passing clouds as this boundary moves through during the evening hours. Lows overnight will range through the 40s. High pressure will build in behind the front on Friday bringing only slightly cooler weather along with abundant sunshine. Highs will again top out above normal ranging from the mid 50s to lower 60s north and mid to upper 60s south. Skies will remain clear Friday night as high pressure continues to build in from the west. Lows will range from the mid 30s north to the mid 30s south. High pressure will crest over the region early Saturday before slipping off to the southeast. return flow will bring even warmer air into the region which will persist into Monday. Looking for highs both days in the mid 60s to lower 70s under mostly sunny skies. Slow moving cold front will approach from the west on Monday bringing increasing clouds and a chance of afternoon showers in the mountains and Connecticut Valley. Moisture and forcing along this boundary will be rather limited so any shower activity should be light and spotty. Highs will once again top out well above normal reaching the mid 60s to lower 70s. && .AVIATION /06Z WEDNESDAY THROUGH SUNDAY/... Short Term...VFR tonight through Wednesday night except for some patchy river valley fog both nights. Areas of LLWS are expected tonight as a 30-40 kt southerly low level jet develops over portions of the region. Long Term...VFR Thursday through Sunday with areas of IFR/LIFR ceilings/vsby in morning valley fog. && .MARINE... Short Term...SCA for ocean waters tonight as southerly winds increase and gust around 25 kt. Winds should decrease Wednesday morning. Long Term... Sca`s may be needed on Thursday. && .GYX WATCHES/WARNINGS/ADVISORIES...
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ME...None. NH...None. MARINE...Small Craft Advisory until 8 AM EDT this morning for ANZ150- 152-154.
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