Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 200838 AFDGYX Area Forecast Discussion National Weather Service Gray ME 338 AM EST Mon Feb 20 2017 .SYNOPSIS...
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High pressure will build in from the west today and will crest over the area tonight. High pressure will shift offshore on Tuesday as a warm front approaches from the west. The warm front will push east through the region Tuesday night and early Wednesday. Low pressure will move northeast through the Great Lakes Wednesday night and will continue northeast through southern Quebec on Thursday....driving a trailing cold front through the region Thursday evening. High pressure will build in from the west Thursday night and will shift east on Friday. A warm front will lift north into New England Friday night and will be followed by a cold front on Saturday.
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&& .NEAR TERM /THROUGH TODAY/...
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Cold front currently pushing south of the region leaving mainly low level moisture in its wake. Downsloping winds already clearing clouds downwind of the mountains and expect this trend to extend into northern zones through daybreak as high pressure builds in from the west. Looking for mostly sunny skies and brisk northwest winds today. Highs will top out in the in the 30s north and upper 30s to lower 40s south.
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&& .SHORT TERM /TONIGHT THROUGH 6 PM TUESDAY/...
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High pressure will crest over the region tonight producing clear skies and light winds. Lows will range through the single numbers north and teens south. High pressure will shift east on Tuesday as a warm front approaches from the west. After a mostly sunny start to the day high clouds will overspread the region during the afternoon. Highs will range from the mid 30s north to the mid 40s south.
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&& .LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/...
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The extended looks to become active once again...with a series of s/wv trofs possibly affecting the area thru the weekend. The difference between this coming week and the pattern that began about two weeks ago...is that the tendency will be for trofing over the Wrn CONUS. This means that ridging will be more likely over the Ern CONUS...and warmer storm system for the forecast area. The first s/wv will be shearing out across the Hudson Bay area Tue night. This will send a decaying cold front towards the region. Forcing will be light...so I am not expecting a significant QPF event. If enough cold air can filter in along and ahead of the front...some light mixed precip is possible. A fast moving Nrn stream s/wv is set to pass N of the region Thu. This will be a mostly non-event S of the mtns...but upslope showers will be possible as the trof passes. At elevation some snow will fall...but warmer temps could lead to rain in the valleys. The strongest s/wv of the week will eject out of the Plains late in the week. Strong low pressure is forecast to develop and cut thru the Upper Midwest. This is set to lift the linger warm front back N thru the forecast area Fri. As we enter the warm sector...I do not expect precip to be widespread...but the front itself may lead to some showers especially in the mtns. There will likely be some cold air damming at the surface that keeps the really mild air at bay...but temps do look warm enough for rain for a good portion if not all of the forecast area. The bulk of that precip will wait until the cold front passes...which should hold off until the weekend.
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&& .AVIATION /07Z MONDAY THROUGH FRIDAY/...
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Short Term...VFR today through Tuesday. Long Term...VFR conditions generally expected to prevail until the end of the work week. A weakening cold front may bring some MVFR showers to the area Tue night...but it does not look widespread. A low pressure system cutting thru the Great Lakes will push a warm front thru the area Fri. This will likely bring an extended period of MVFR or lower.
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&& .MARINE...
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Short Term...Continuing sca`s through this evening for the outer waters and through this afternoon for the bays. Long Term...Winds and seas expected to remain below SCA thresholds thru the end of the week.
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&& .GYX WATCHES/WARNINGS/ADVISORIES...
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ME...None. NH...None. MARINE...Small Craft Advisory for winds from 6 AM this morning to 5 PM EST this afternoon for ANZ151-153. Small Craft Advisory until 7 PM EST this evening for ANZ150- 152-154.
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&& $$ Sinsabaugh/Legro

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