Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 200737 AFDGYX Area Forecast Discussion National Weather Service Gray ME 337 AM EDT Sat May 20 2017 .SYNOPSIS... Cool high pressure builds across the area today and becomes centered over the area tonight and early Sunday. Areas of frost are expected tonight across mountain and most central areas of Maine and New Hampshire. High pressure shifts east on Sunday. Low pressure will move in from the west on Monday bringing cool weather and some rain. Another low pressure system may affect the region midweek. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... High pressure will continue to build across the region today with a cool light north wind expected. Some high clouds will be noted early this morning over southern areas otherwise sunny skies will be noted. Temps will be cooler but near seasonable levels with highs in the 60s. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/... High pressure becomes centered over the area tonight. Clear skies and winds becoming calm will allow radiational cooling to occur. The air mass will be very dry so temps will be allow to fall to near or below freezing in the mountains and some of the foothill locations so a freeze warning has been issued for later tonight across those areas. A little further south in inland locations frost advisories have been issued for later tonight as temps drop into the mid 30s. Sunday starts out sunny and cool with calm winds but temps will recover rather quickly under those sunny skies through the morning. The center of high pressure will begin move off the coast in the afternoon. High clouds will begin to spill across the ridge in the afternoon. Calm winds will allow afternoon seabreezes to develop along the coast. Temps will once again be near seasonable levels reaching the mid 60s to lower 70s. && .LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... Low pressure will approach from the west Sunday night allowing clouds to spread across the region from west to east. However, most locations will remain dry overnight except perhaps the CT River Valley where some light rain could arrive late. Light rain then overspreads much of the region during the day on Monday. Totals will not be overly high as most of the heaviest precipitation slips to our south. Not a great day even if rain stops occasionally, as clouds and initial evap cooling will bring temps down in the 40s most areas. It may actually be cold enough at the start to allow for some snow to mix in across the higher elevations of the western ME mountains. Rain will gradually taper off from west to east Monday afternoon but there could be a decent amount of drizzle (especially on the coastal plain) through Monday night. Tuesday will be a sunnier day with higher temperatures as we`ll be in between two low pressure systems. The next potential system to affect northern New England looks to come about Wed-Thu as low pressure moves in front the southwest. This one could be accompanied by more rainfall than the weaker Monday system. Overall, not the best week weather- wise. && .AVIATION /08Z SATURDAY THROUGH WEDNESDAY/... Short Term...VFR. Long Term...VFR conditions are expected much of Sunday night. During monday, low clouds and light rain should bring conditions down to IFR or lower, especially during the afternoon and overnight hours. Improvement is foreseen for Tuesday before conditions deteriorate again sometime Wed with the next low pressure system. && .MARINE... Short Term...Winds and seas will remain light through Sunday. No flags. A Beach Hazard Statement will be issued for the coast today due to the cold ocean temps. Long Term...SCA conditions will be possible Tuesday as seas build to 4-6 ft on the ocean waters. Low pressure potentially affecting the waters Wed-Thu could allow for SCA winds and seas. && .FIRE WEATHER... Canadian air mass brings in very dry air today. As the May sun does its work on the dry air mass, relative humidity values will fall to 20-30 percent. However, wind speeds are expected to remain fairly light and should prevent dangerous fire growth conditions. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...Freeze Warning from 2 AM to 8 AM EDT Sunday for MEZ007>009-012. Frost Advisory from 2 AM to 8 AM EDT Sunday for MEZ018>020. Beach Hazards Statement through this evening for MEZ023>028. NH...Freeze Warning from 2 AM to 8 AM EDT Sunday for NHZ001-002-004. Frost Advisory from 2 AM to 8 AM EDT Sunday for NHZ003-006-010. Beach Hazards Statement through this evening for NHZ014. MARINE...None. && $$ NEAR TERM...Marine SHORT TERM...Marine LONG TERM...Ekster is the U.S. government's official web portal to all federal, state and local government web resources and services.