Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 061140 AFDGYX Area Forecast Discussion National Weather Service Gray ME 640 AM EST Tue Dec 6 2016 .SYNOPSIS... High pressure builds over the area today. A weak trough of low pressure approaches from the west Wednesday morning with more light snow possible. A cold front arrives from the northwest on Friday ushering in some of the coldest air of the season so far for this weekend. && .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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642 am Update... Just a quick update to adjust for low temperatures across the region due to radiational cooling in some locations. Also, clouds persist in the mountains and over western sections near the CT River Valley. Have removed most of the fog from the forecast as conditions improve. Prev Disc... An SPS remains in effect for early morning slick spots due to refreezing of ice, especially on secondary roads. Otherwise clouds will slowly dissipate over the mountains where a favorable upslope flow continues. Low clouds persist in the CT River Valley as well. Lowered overnight mins last night as radiational cooling took hold in areas such as IZG. SFM dropped down to 10 degrees during the last hour. Increasing sunshine can be expected where clouds persist. Nearly full sunshine will allow temperatures to climb into the 30s in most areas with near 40 over southern NH. Increasing high thin clouds expected later in the afternoon as a weak system approaches from the southwest.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM WEDNESDAY/... Clouds thicken and lower tonight as low pressure exits off the Mid Atlantic seaboard and a cold front approaches from the west. This front will be relatively moisture starved, however some very light snow will break out by Wednesday morning over southwest NH. Relatively low pops due to the lack of dynamics and moisture on Wednesday morning. Nevertheless, areas that do pick up snow in southern NH will lead to locally slick driving conditions in and around the time of the morning commute once again. However, an inch or less snowfall is expected, mainly over NH and far western Maine by the time the precip ends later Wednesday morning. A southwest flow aloft will bring drier air into the region by later in the day Wednesday. Temperatures will respond with readings in the 30s, with even some lower 40s over far southern areas. && .LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/... A broad upper trough over the Great Lakes will move east into New England Thursday and Friday bringing scattered snow showers mainly to the mountains. This trough exits to the east over the weekend. A much colder arctic air moves into the region behind this trough late Friday and into the weekend. The coldest temperatures of the season can be expected over the weekend with dry conditions as the Canadian ridge of high pressure settles over the area. High temperatures Saturday will only reach the teens and 20s. Strong radiational cooling due to clear skies and calm winds will make overnight lows Saturday night fall into the single numbers to lower teens. By late in the weekend time frame around Sunday night an approaching upper trough moves across the Great Lakes and may spread some warm air advection light snow across the area. Models generally agree on timing. && .AVIATION /12Z TUESDAY THROUGH SATURDAY/... Short Term...Low clouds continue to be persistent over the mountains where upslope conditions persist and in the Conneticut River Valley. Just about all of the fog has dissipated. Long Term...A northwest flow will allow for scattered mountain snow showers through the weekend. VFR conditions except MVFR at times at KHIE. && .MARINE... Short Term...Some gusts approaching SCAs early this morning followed by a relaxation in the gradient. Winds/seas to remain below SCA criteria thereafter in the near/short term. Long Term...A cold west to northwest flow will persist through the weekend. SCA winds are expected to develop Friday and into the weekend. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ JC/RAM is the U.S. government's official web portal to all federal, state and local government web resources and services.