Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 170244 AFDGYX Area Forecast Discussion National Weather Service Gray ME 944 PM EST Sat Dec 16 2017 .SYNOPSIS... High pressure will build into the region tonight and Sunday. Two weak systems will move through early next week bringing scattered snow showers except rain or snow showers over southernmost areas. Cooler weather returns again late in the week as Canadian high pressure builds southeast into the region. && .NEAR TERM /UNTIL 6 AM SUNDAY MORNING/...
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945 PM Update...Little change to the going forecast. Upslope clouds in the northern mountains will continue until after midnight. Otherwise, clear and cold conditions elsewhere. 650 PM Update...Snow squalls are now offshore and no others are expected for the rest of the night. Just a few minor adjustments to the going forecast. Overall, cold and quiet weather expected. 510 PM Update...Have updated mainly PoP and weather for the next few hours to better track the snow showers and squalls out there this evening. They should be off the coast or very close to doing so by 00z and likely in a weakened state from earlier. However some brief vsby restrictions to 1/4 mile are possible as far south and east as Portland and Portsmouth. Have issued SPSs for these. Otherwise, little change to the going forecast. Previously... Sfc front crossing the CWA attm, and may see a few flurries through about 6-7 pm almost anywhere, but for the most part any accum snow will be limited to the mountain upslope, and even this will begin to wane later this evening. Should be enough flow this evening to limit to decoupling across most spots, but winds will diminish as sfc high pushes in from the west, so some partial rad cooling is possible late, with lows from 0-5 above in the mountains to 10-15 in the south.
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&& .SHORT TERM /6 AM SUNDAY MORNING THROUGH SUNDAY NIGHT/... Sunday looks mainly sunny and chilly. High clouds will spread into SW zones mid-late afternoon, but winds will be light and highs will range from 15-20 in the mountains to the mid to upper 20s on the coast and in srn NH. A weak wave in the westerly 500 MB flow aloft pushes into the ridge late Sunday night, and will bring clouds across the CWA overnight. There is the chance for some SHSN or light SN in the west late, but for the most part looks like precip will hold off until early Monday. && .LONG TERM /MONDAY THROUGH SATURDAY/... Mostly quiet weather is expected through the long term period with only light precipitation expected through the period. A weak wave of low pressure will cross the region Monday with scattered snow showers. Temps will remain below freezing throughout the day except southernmost NH where highs could climb to the lower 30s. Warmer temperatures will follow for Tuesday as another weak system approaches from the west. Light mixed precipitation is possible southern areas late Tuesday and Tuesday night with light snow showers possible across northern areas. Temps will start to cool off again Wednesday with colder weather expected for Thursday. Another weak system approaches Friday with the chance for mixed precipitation across the southern areas and snow in the mountains. && .AVIATION /03Z SUNDAY THROUGH THURSDAY/... Short Term...Mainly VFR through Sunday night. KHIE could a few SHSN through this evening, which could produce MVFR at times, but these will become less frequent as the evening wears on. Long Term...Mainly VFR conditions Monday through Thursday except for some MVFR conditions possible in snow showers Monday and again late Tuesday and Tuesday night. && .MARINE... Short Term...Will see a bit of a surge of winds behind a cold front crossing the waters around sunset, but these will begin to diminish after midnight. After that, winds remain light with tranquil seas through Sunday night. Long Term...SCAs likely Tuesday afternoon through Wednesday. && .GYX WATCHES/WARNINGS/ADVISORIES...
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ME...None. NH...None. MARINE...Small Craft Advisory until 1 AM EST Sunday for ANZ150-152-154.
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&& $$ NEAR TERM...Ekster

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