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. --
000 FXUS61 KGYX 212340 AAA AFDGYX Area Forecast Discussion...UPDATED National Weather Service Gray ME 740 PM EDT Fri Apr 21 2017 .SYNOPSIS... A moist onshore flow will continue through tonight as a complex area of low pressure over western New England moves slowly eastward. We`ll see occasional light rain along with areas of drizzle and fog. Some wet snow and sleet will remain possible across the higher terrain near the international border. We`ll continue to see cool unsettled weather on Saturday as low pressure remains across the area. High pressure and drier air will finally build into the region on Sunday. A cold front will cross the region sunday night into Monday. Low pressure will move up the Eastern Seaboard Tuesday and Wednesday. && .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/... 730 PM Update... Showers were moving across central and southern NH as well as most of Maine this evening with light accumulations of rain so far. Snow has begun to mix in near Frenchville and Greenville Maine and this trend will grow with areas near the Carrabasset Valley and other mountainous locations seeing snow, sleet, and freezing rain at times. Surface temperatures hover around the freezing mark in these areas, and warmer air arrives around 3k feet later tonight which will contribute to a warm nose noted on forecast soundings. Reworked the PoP and weather grids to reflect latest mesoscale guidance concerning the atmospheric temperature profile. This resulted in much the same forecast with maybe a little more snow for central Coos County. Maintained/added areas of fog and drizzle as well. Previous discussion... At 18z...A broad area of low pressure extends from the eastern Great Lakes through the mid atlantic region. Forecast area remains in the moist onshore flow off the Gulf of Maine with clouds and areas of light rain drizzle and fog. Little change tonight with the cool damp conditions to linger. Along the international border the higher terrain may see some light snow or sleet accumulation as well. Lows tonight will range from the mid 30s to lower 40s. && .SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/... On Saturday...Maine and seacoast New Hampshire will remain in the moist onshore flow for the balance of the day with clouds and some areas of drizzle and fog along with a few showers. Over the remainder of New Hampshire...an occluded front will move slowly eastward with the somewhat drier but light westerly flow helping to dry thinks out a bit during the afternoon hours. Clearing finally arrives Saturday night as high pressure builds into the area. && .LONG TERM /SUNDAY THROUGH FRIDAY/... The extended portion of the forecast will start out on a good note, with high pressure over the region Sunday while a weak cold front approaches from the northwest. The result should be a good amount of sun with temperatures well into the 50s if not the 60s in some locations. The aforementioned cold front will drop across the region Sunday night with little fanfare...perhaps a period of bkn skies. High pressure builds in on Monday as the cold front settles over southern New England. The result should be a nice day - a good amount of sunshine with temperatures in the 60s. The high continues to nose in from the northeast Monday night and Tuesday. However, things look to quickly change during the day Tuesday as northern and southern stream short wave troughs team up and move toward New England. As long as current model progs are close to reality, we`re looking at rain developing from S to N Tuesday which then continues into Wednesday. Better conditions are possible Thursday and Friday as the system moves away, but current indications are that a cool easterly SFC flow may remain in place. && .AVIATION /00Z SATURDAY THROUGH WEDNESDAY/... Short Term /through Saturday night/... IFR to LIFR will continue into Saturday along the coast. Elsewhere...MVFR with areas of IFR through Saturday morning in drizzle and fog. Improving to VFR throughout Saturday night from west to east as high pressure builds into the area. Long Term...VFR conditions look likely Sunday, which should continue through Monday night. Deteriorating conditions (MVFR to IFR) are once again expected to develop by Tuesday afternoon and last through Wednesday in rain/low clouds. && .MARINE... Short Term /through Saturday night/...We`ll continue with SCA conditions tonight. On Saturday...we`ll likely see lingering SCA seas outside the bays. Long Term...SCA conditions will be possible Tuesday through Thursday. && .FIRE WEATHER... A moist air mass will remain through Saturday as onshore flow persists with areas of drizzle and fog along with a few showers. Sunday will be drier but humidity levels will remain moderate. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...Small Craft Advisory until 7 AM EDT Saturday for ANZ150>154. && $$ NEAR TERM...Hanes SHORT TERM...Schwibs LONG TERM...Ekster

USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.