Area Forecast Discussion
Issued by NWS Portland, ME

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718 FXUS61 KGYX 200048 AFDGYX Area Forecast Discussion National Weather Service Gray ME 748 PM EST Sun Feb 19 2017 .SYNOPSIS... A weak cold front will move farther offshore tonight. High pressure will build in from the northwest Monday and will crest over the area Monday night. High pressure will shift offshore on Tuesday as a weak warm front approaches from the west. The warm front will push east through the region Tuesday night. Weak low pressure will move east through the northern Great lakes on Wednesday and will continue east through southern Quebec Wednesday night. A trailing cold front will gradually drop south through the region on Thursday...stalling over southern New England. The front will lift northward as a warm front on Friday. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/...
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Update... Have updated the grids based on current conditions and model data for the overnight period. Cooler air will continue to gradually filter into the region on northwest winds after a day with high temperatures in the 50s for many areas. Clouds have increased in southern areas despite the northwest downslope flow. Also, will be monitoring once again for possible refreeze from today`s snowmelt. Have upped pops over northern and central areas. Rain and snow showers will continue to slip out of the mountains from time to time. Have resent snow probabilities to the web. Prev Disc... Surface cold front has moved through the area. The wind shift went through Portland at 2pm and we`ll see temperatures continue to fall this evening as northwesterly flow and cold air advection increases. Prior to the arrival we saw some very warm temperatures with readings in the 50s common throughout the area. Winds will increase overnight as cold air advection takes hold.
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&& .SHORT TERM /6 AM MONDAY MORNING THROUGH MONDAY NIGHT/... Monday surface high pressure will move in bringing and end to the northwesterly winds as the pressure gradient moves off to the east. Monday will be mostly sunny although not quite as warm as today with highs nearing 40F rather than 50F. By Monday night we see increasing heights aloft however the high directly overhead with clear skies should allow for good radiational cooling. Have dropped temperatures to just below zero in the northern mountain valleys. && .LONG TERM /TUESDAY THROUGH SUNDAY/... Above normal temperatures and a continued break from high impact weather will continue for much of the extended period. We`ll see several other days with readings over central and southern sections nearing the 50s and even 60 on Thursday. High pressure slides offshore Tuesday allowing for warm air advection ahead of a frontal system. Warm air will spread over colder air at the surface late Tuesday night into Wednesday morning creating a wintry mix for a few hours. This may result in slick roads and walking surfaces. A slight chance of light rain and snow showers will continue for the higher terrain off and on with near zonal flow in place and another frontal fracture approaching late in the week. The next system bringing any widespread precipitation will occur next weekend when a deeper short wave spurs coastal low development near the Gulf of Maine. && .AVIATION /01Z MONDAY THROUGH FRIDAY/... Short Term...VFR conditions will continue through Monday night. The one exception will be the mountains where areas from HIE to B80 will see MVFR with possible shsn. Long Term...VFR conditions are expected Tuesday. MVFR conditions will be possible Tuesday night in light mixed precipitation. VFR conditions are then expected Wednesday and Thursday. && .MARINE... Short Term...Cold front will cross the waters this evening with cold air advection and northwesterly flow moving in behind the front. winds will increase to around 25-30kts and the small craft advisory has been extended through Monday. Long Term...No increased winds or waves over the waters to speak of until next weekend when coastal low pressure may develop. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...Small Craft Advisory for winds from 6 AM to 5 PM EST Monday for ANZ151-153. Small Craft Advisory until 7 PM EST Monday for ANZ150-152-154. && $$ NEAR TERM...Cannon SHORT TERM...Cannon is the U.S. government's official web portal to all federal, state and local government web resources and services.