Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 221924 AFDGYX Area Forecast Discussion National Weather Service Gray ME 324 PM EDT MON AUG 22 2016 .SYNOPSIS...
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High pressure will build in from the west tonight and will shift offshore south of New England on Tuesday. High pressure will hold off the coast through Wednesday. A warm front will cross southern Canada on Thursday. A cold front will approach from the west Thursday night and will cross the region early Friday. High pressure will build in from the west Friday night through Saturday and will shift east of the region on Sunday.
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&& .NEAR TERM /THROUGH TONIGHT/...
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Gusty CAA NW flow continues into the evening. Largest 3 hour pressure changes are occurring right about now...so the strongest gusts should be in the next couple of hours before diminishing. Gradient flow continues into the evening...so I am expecting a slow fall of temps until late. A much drier air mass will support cool temps compared to recent nights for anyone that can decouple. I suspect far Nrn valleys will be able to decouple and fall into the lower 40s in places.
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&& .SHORT TERM /TUESDAY THROUGH TUESDAY NIGHT/...
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High pressure will be in control Tue. Winds will be lighter and temps similar to today. Without the wind it will feel a little warmer though. Weak gradient across the area will support afternoon sea breezes on the coast...which will cool things off slightly for the second half of the day. Better chance for radiational cooling Tue night...with patchy valley fog developing in the favored locations.
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&& .LONG TERM /WEDNESDAY THROUGH MONDAY/...
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Return flow around high pressure south of New England will bring warmer and more humid air back into the region on Wednesday. Expect mostly sunny skies through the day with highs ranging through the 80s to near 90. Skies will remain mostly clear Wednesday night with lows from the mid 50s north to the mid 60s south. Should see a little more in the way of cloudiness on Thursday as a warm front crosses southern Canada. Expect any shower activity associated with this boundary to remain north of the border. Highs will once again range through the 80s. A cold front will approach from the west Thursday night bringing a chance of showers and thunderstorms to the region Mainly after midnight. Should see a mild night with lows ranging through the 60s. Cold front will cross the region friday morning bringing clearing skies and cooler less humid air in on northwest winds. Highs on Friday will range from the upper 70s north to the upper 80s south. High pressure building in from the west Friday night and Saturday will set the stage for a mostly sunny weekend. Expect seasonable temperatures both days with highs from the mid 70s north to the mid 80s south.
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&& .AVIATION /18Z MONDAY THROUGH SATURDAY/...
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Short Term...VFR conditions will prevail thru Tue night. Gusty NW winds diminish after sunset. If Nrn valleys can decouple fast enough...some patchy valley fog is possible. LAMP guidance wants to bring LIFR conditions to both HIE and LEB...but my confidence is not high enough to include in the TAFs. Otherwise...Srn NH and coastal ME terminals should maintain enough gradient flow to preclude fog development. High pressure dominating Tue may allow sea breezes to develop along the coast...but otherwise VFR conditions. Long Term...Generally VFR Wednesday through Thursday. Areas of MVFR ceilings and vsby in Showers and thunderstorms Thursday night. VFR Friday through Saturday.
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&& .MARINE...
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Short Term...Gusty NW winds will continue into the evening on CAA. A few gusts may approach 25 kts...but in general winds and seas will remain below SCA thresholds. Winds and seas both diminish Tue. Long Term...SCA`s may be needed Thursday in increasing southwest flow.
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&& .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ Legro/Sinsabaugh

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