Area Forecast Discussion
Issued by NWS Portland, ME

Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
301 FXUS61 KGYX 271123 AFDGYX Area Forecast Discussion National Weather Service Gray ME 723 AM EDT Thu Oct 27 2016 .SYNOPSIS... A narrow ridge of high pressure will slide off to the east today. Low pressure will slowly move east through the region tonight and Friday, bringing rain for most of the region with snow at the highest elevations. A ridge of high pressure will build in from the west Friday night and will be quickly followed by a cold front on Saturday. High pressure will build in from the west Saturday night through Monday. Low pressure will pass by well to our north Tuesday and Wednesday. && 11z update... Quick update to adjust temp/td/sky grids. High clouds continue to stream in from the west early this morning and clouds will continue to thicken and lower through early afternoon. Still looking for rain to push into southwestern zones around mid afternoon. No other changes planned attm. Previous discussion... .NEAR TERM /UNTIL 6 PM THIS EVENING/... High clouds already pushing into the region ahead of low pressure approaching from the west. Lingering low level moisture in the form of sc across much of western Maine and portions of New Hampshire helping to keep temps up early this morning. Snow and mixed precipitation currently pushing through central New York but this area is moving into a very deep layer of dry air and will likely take till mid to late afternoon to get into southern New Hampshire and the connecticut valley. By then...expect boundary temps to have warmed above freezing so only looking for a brief period of wet snow or mixed precip at the onset...mainly over the higher terrain. High temps today will reach the lower to mid 40s in most areas. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/... Rain will overspread the forecast area from southwest to northeast through the evening hours with wet snow or sleet in the mountains. Expect snow or mixed precip to go over to rain in northern New Hampshire and far northwest Maine after midnight. Snow and mixed precip will last longest in far northeast zones where 3 to 5 inches may accumulate through noon Friday. Being a late second to 3rd period event...will let the day shift decide on advisories or any warnings for snowfall. Expect rain to become heavy at times after midnight and into Friday morning in southern and central zones as strong low level jet swings in from the west. Highest rainfall amounts of 1 to 2 inches will fall in favorable upslope areas along the eastern slopes with a good deal of shadowing to the northwest of the Whites. Same amounts will accumulate in southern interior and coastal zones. Low temps will range from the mid 30s north to the lower 40s south. Rain will be heavy at times Friday morning and into Friday afternoon as low pressure pushes into the Gulf of Maine. Snow in far northeast zones will gradually change to rain or mixed precip before eneding Friday evening. Expect rain to taper off in southwest zones by mid to late afternoon and will gradually shift east of the forecast area during the early evening. Highs temps will top out in the mid 30s to mid 40s north and mid 40s to lower 50s south. && .LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/... Low pressure slowly exits to our east Friday night, moving from the Gulf of Maine to the Halifax Nova Scotia region. Systems are currently lined up, embedded in a fast flow aloft. Therefore, expect only a short period of partial clearing associated with a very small ridge of high pressure. On the exiting systems heels will be an approaching cold front on Saturday which will cross the region Saturday night. Due to its track, this front will be relatively moisture starved. Moisture of the precipitation will be in the liquid form as temperatures modify for the first half of the weekend. Cooler and drier air will enter much of the region on Sunday. However, a weak wave passing by south of New England may allow for additional cloudiness during the day. Early to midweek next week will feature fairly dry conditions as a ridge of high pressure parks itself over the region. A strong low pressure system will exit the Great Lakes region during the period. However, model consensus suggests its track will take it well to the north and west of Maine and New Hampshire as it enters southern Canada. && .AVIATION /11Z THURSDAY THROUGH MONDAY/... Short Term...VFR this morning with MVFR/IFR ceilings developing late this afternoon and evening. Widespread ifr/lifr ceilings/vsby tonight and Friday. Long Term...Some MVFR possible Saturday afternoon and evening with cold frontal passage. Otherwise expect mainly VFR conditions through the long term portion of the forecast. && .MARINE... Short Term...Replacing Gale Watch with Gale Warnings 06z Friday through 00z Saturday. Long Term...Winds and seas gradually subside Friday night and Saturday. && .GYX WATCHES/WARNINGS/ADVISORIES...
-- Changed Discussion --
ME...None. NH...None. MARINE...Gale Warning from 2 AM to 8 PM EDT Friday for ANZ150>154.
-- End Changed Discussion --
&& $$ is the U.S. government's official web portal to all federal, state and local government web resources and services.