Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 230722 AFDGYX Area Forecast Discussion National Weather Service Gray ME 322 AM EDT Sun Jul 23 2017 .SYNOPSIS...
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High pressure will build in from the north today providing for a cooler and drier day than Saturday. Low pressure will approach from the southwest later tonight and Monday and will deliver cooler temperatures and the likelihood of rain. Conditions will gradually improve by Tuesday night and Wednesday as high pressure moves in. A cold front approaches late in the week.
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&& .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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High pressure will build in from the north today providing fair and cooler weather. High temperatures will mainly be in the 70s today with a few lower 80s possible. Onshore flow developing during the afternoon should knock temperatures along the coast down into the 60s by early evening. Skies will be partly sunny, with an increase in clouds expected later in the day as a WAA regime gets going.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM MONDAY/...
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A short wave trough will approach early on tonight and should aid in spreading rain across NH after midnight. This rain (mainly light) will then spread across Maine on Monday. Not a very nice July day to be had with temperatures mainly in the 60s, with a prolonged period of 50s possible where the rain is early and steady during the day.
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&& .LONG TERM /MONDAY NIGHT THROUGH SATURDAY/...
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The week begins with an upper level trough in place over the northeast United states. The trough and associated surface low will move east of the region late Tuesday with high pressure building in for Wednesday. Another upper low will approach on Thursday pushing a surface cold front through the region. Monday night low pressure will move through the Gulf of Maine with a secondary surface low trying to spin up along the St. Lawrence river. Still expect a region of widespread rain around the low center in the Gulf o Maine with a secondary maxima through the St lawrence valley. Some periods of heavy rain are possible on Tuesday morning with more widespread light rain. Along the coastal plain of Maine look for some drizzle as saturated low levels and northeasterly flow continue while the dynamics split to the east and west. It`ll be a damp night across the region with rain, drizzle, fog and lows in the upper 50s. This damp weather will continue through Tuesday morning with the skies finally starting to clear late Tuesday allowing temperatures to rebound into the mid 70s in parts of f the area. High pressure builds back into the region on Wednesday as the upper low move off to the northeast. The overall pattern will continue to be quite progressive as the next upper level trough dives south of the canadian prairies by Thursday. This forcing aloft will provide good support for a cold front which will move through late afternoon Thursday. With temperatures warming to the upper 70s to near 80 ahead of this front and dewpoints near 60s expect the afternoon timing to be more than enough to set off a line of thunderstorms. Friday high pressure returns to end the week.
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&& .AVIATION /07Z SUNDAY THROUGH THURSDAY/...
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Short Term /through Monday/...VFR conditions are expected today through much of tonight. However, MVFR conditions are expected to arrive Monday morning as rain moves into the region...possibly as early as tonight across NH. Long Term...Low pressure will move through the gulf of Maine Monday night into tuesday brining widespread rain drizzle and IFR conditions overnight. Conditions will begin to improve on Tuesday and return to VFR with just some valley fog possible on Tuesday night. Wednesday will return to VFR. A front will cross the region on Thursday with thunderstorms possible at all terminals.
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&& .MARINE...
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Short Term /through Monday/...Northeasterly flow early this morning may gust around 25 kt for a short time prior to 12z off the southern ME coast and Seacoast of NH. Will forgo SCA at this time because it will be marginal and brief. Otherwise, SCA conditions may begin to develop late Monday afternoon with low pressure to the south of the region. Long Term... Northeast winds will increase on Monday night into Tuesday ahead of a low moving through the Gulf of Maine. A small craft may be needed in this time period for the outer waters. Widespread fog and rain is expected as the low moves through. Winds and seas will subside by Tuesday with high pressure building in for Wednesday.
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&& .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ NEAR TERM...Ekster SHORT TERM...Ekster LONG TERM...Curtis

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