Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 151225 AFDGYX Area Forecast Discussion National Weather Service Gray ME 725 AM EST Fri Dec 15 2017 .SYNOPSIS... High pressure shifts east today. Weak low pressure to our north and south will provide clouds, and maybe a few snow showers or flurries Friday night into early Saturday. High pressure builds in on Sunday and starts a warming trend. Although slightly warmer, several fast moving systems could provide some light precipitation early to mid next week. && .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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720 am Update: A very cold start to the day. Input latest obs data. No changes needed to forecast at this time. Previous Discussion: The long wave trof over the northeastern CONUS has two separate approaching short waves that will be watched, one approaching from the Great Lakes while the other races well out to sea from off the mid atlantic coast. In the meantime, high pressure moves to the east later today. The day will start out sunny but very cold. The afternoon will see increasing high clouds from the southwest to northeast ahead of the approaching short wave over the Great Lakes. Temps will start out very cold this morning and will be slow to recover in the afternoon. Stayed with a blend of guidance temps for highs.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SATURDAY/... An approaching short wave (clipper) from the Great Lakes will spread clouds and scattered snow showers into the mountains tonight into Saturday. Very limited moisture will be associated with this system so little to no accumulations are expected. Meanwhile the southern short wave that passes off the mid atlantic coast and then well out to sea may spread some ocean clouds into some coast areas for a time tonight but the northern and western edge of the precipitation shield will stay off the coast. Models in good agreement on this. Temps will be not as cold tonight and Saturday and used a blend of guidance. && .LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/... Northwesterly flow is established once Saturday`s system shifts offshore. Throughout the end of the weekend and the beginning of the work week the upper level flow will become southwesterly with fast moving impulses moving through and bringing periods of precipitation to northern New England. At the surface high pressure builds in through the day Sunday. A warm front lifts ENE into the region late Sunday into Monday. This feature eventually shifts south but showers will be possible across south NH and ME as it does so. A more significant storm system drives a cold front through the region Tuesday. The parent low will be located well to the north in Canada...but widespread showers are expected through Tuesday night. Upslope showers will be possible in the mountains through Wednesday. High pressure noses in briefly Wednesday night into Thursday. Another clipper moves just north of the region Friday into Saturday. Warm advection showers are expected Friday as the warm front lifts over the area...before a cold front sweeps through late Friday. && .AVIATION /13Z FRIDAY THROUGH TUESDAY/... Short Term...VFR. Long Term...MVFR conditions possible Monday and Tuesday in snow showers. Otherwise VFR. && .MARINE... Short Term...Winds have diminished this morning and will become light by this afternoon and evening. After the passage of the clipper on Saturday the northwest winds will increase and become gusty and may require a SCA over the outer waters. Long Term...Next chance of SCA winds will occur Tuesday afternoon and evening with gales possible on Wednesday/ && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ NEAR TERM...Marine SHORT TERM...Marine LONG TERM...Hanes is the U.S. government's official web portal to all federal, state and local government web resources and services.