Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 230652 AFDGYX Area Forecast Discussion National Weather Service Gray ME 252 AM EDT Tue May 23 2017 .SYNOPSIS...
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Weak high pressure will build south of the region today and will hold over the region tonight and Wednesday as low pressure passes well offshore. A complex area of low pressure will approach from the southwest Wednesday night and Thursday and will slowly move northeast through southern New England and the Gulf of Maine Thursday night and Friday. High pressure will build in from the west Friday night and Saturday. A cold front will drop south through the region Saturday night and Sunday.
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&& .NEAR TERM /THROUGH TODAY/...
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Low pressure will depart off to the east early on today. As a westerly flow develops early on this morning, the low clouds, fog, and drizzle will be shunted offshore. The result should be a partly sunny day with highs in the 70s at most locations with light winds.
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&& .SHORT TERM /TONIGHT THROUGH 6 PM WEDNESDAY/...
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As a short wave trough amplifies over the lower OH valley tonight and Wednesday, deep layer ridging will develop over New England. This should allow for another nice day on Wednesday as low pressure passes well to our south. It may be a bit more cloudy, but highs should reach into the 70s once again.
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&& .LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/...
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High pressure will hang on through Wednesday night as low pressure over the Ohio Valley slowly begins to lift northeast. After a partly cloudy evening expect high and mid level clouds to over- spread the region from the west. Low temps will range from the mid 40s north to the mid 50s south. Complex area of low pressure will continue to lift toward New England on Thursday. Best forcing remains south of the region through the day along a developing warm front. Will likely stay close to SB numbers for pops but expect any showers to be light and spotty. Increasing onshore flow will likely bring ocean stratus into the picture in southern zones during the afternoon and evening. High temps away from the coast should reach the mid to upper 60s with upper 50s to lower 60s along the coast. Low pressure becomes vertically stacked south of New England Thursday evening and will slowly drift northeast overnight. Looking for occasional periods of rain overnight but nothing too heavy. QPF will only amount to a quarter inch or less through daybreak Friday. Lows overnight will be fairly uniform across the forecast area with most locations bottoming in the lower to mid 50s. Low pressure will move northeast through the Gulf of Maine and into the Maritimes on Friday. Looking for rain for much of the day before precipitation tapers to showers late Friday afternoon. Models in fairly good agreement on QPF with most areas picking up a a half to 1 inch of accumulation with some higher amounts in mid coast Maine. Highs on Friday will once again range through the 60s with coolest readings along the coast. Low pressure will pull away from the region Friday night as a shallow surface ridge builds in from the west. Looking for clearing skies during the evening hours. Lows overnight will range from the mid 40s north to the lower 50s south. High pressure will build south of the region on Saturday bringing a mix of sun and clouds to southern and central zones. A backdoor cold front settling into northern Maine will bring increasing clouds and a chance of afternoon showers to northern zones. Highs on Saturday will range from the mid 60s to lower 70s. Backdoor front will continue to settle south Saturday night and Sunday. After a chance of evening showers in the north...not looking for much more than variable clouds overnight. Lows will range through the 40s north and lower to mid 50s south. Frontal boundary will stall over southern New England on Sunday as high pressure builds south from Canada. This boundary may be the focus for clouds and afternoon showers in southern New Hampshire and southwest Maine as an onshore flow increases north of the front. Expect highs in the 60s to near 70 but dropping back into the lower 60s along the coast in the afternoon.
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&& .AVIATION /07Z TUESDAY THROUGH SATURDAY/...
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Short Term...IFR conditions early this morning should improve to VFR by around 13z. These VFR conditions should continue for most terminals through Wednesday. Long Term... VFR Wednesday night and Thursday. IFR/LIFR ceilings and vsby Thursday night and Friday...improving to VFR Friday night. VFR Saturday.
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&& .MARINE...
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Short Term...Conditions should remain below SCA thresholds today through Wednesday. Long Term... SCA`s may be needed Thursday night through Friday.
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&& .FIRE WEATHER...
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Warmer and drier weather is expected today and Wednesday with RH values generally in the 40s. Renewed chances for rain will arrive for Thursday and Friday.
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&& .TIDES/COASTAL FLOODING...
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Highest astronomical tides of the season will likely result in some minor coastal flooding at the time of High tide Thursday night and again on Friday night.
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&& .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$

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