Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 271859 AFDGYX Area Forecast Discussion National Weather Service Gray ME 259 PM EDT Sun May 27 2018 .SYNOPSIS... High pressure over the maritimes will retreat well offshore tonight. Weak low pressure passing to our south tonight and early Monday will spread clouds across the entire forecast area. Any showers with this disturbance should be spotty and largely confined to far southern New Hampshire and the southern tip of Maine. Another low will pass to our north on Monday with a trailing cold front to cross the region Monday night preceded by a few showers across the mountains and foothills. High pressure will build over the region Tuesday and will push offshore south of New England Wednesday. Low pressure may bring appreciable rainfall to the region Friday into next weekend. && .NEAR TERM /THROUGH TONIGHT/... At 18z...a 1028 millibar high was over Nova Scotia. A wavy frontal boundary extended from south of Long Island through the DELMARVA region. GOES imagery showed the cloud shield ahead of a weak impulse and associated surface wave overspreading the remainder of the forecast area at moment. An area of showers across western New England were creeping eastward and will graze southern and western sections of the forecast area through early tonight. Onshore flow between the retreating maritimes high and the disturbance to our south will complicate matters as it may produce some low clouds and patchy fog for coastal and southern areas overnight. && .SHORT TERM /MONDAY and MONDAY NIGHT/... Slow improvement Monday as clouds decrease from west to east behind the departing disturbance and the flow becomes more southerly. There may be some lingering low clouds east and north of Casco Bay until early afternoon as the trajectory remains onshore. Otherwise...becoming partly sunny by afternoon with highs ranging from around 60 on the coast...to around 70 inland. Low pressure will be passing by to our north across Quebec Province late tomorrow and tomorrow night with the trailing frontal system producing a few showers across northern and mountains sections. Those showers will quickly end tomorrow night as high pressure builds in from the northwest. && .LONG TERM /TUESDAY THROUGH SUNDAY/... A cold front will be departing offshore Tuesday morning. High pressure moves in during the day on Tuesday and moves across the region Wednesday. On Tuesday, despite the morning cold frontal passage we`ll still warm up well into the 70s and 80s across the region. High pressure will settle across the forecast area Tuesday night. With light winds and dry air in place, we should see good radiational cooling. Some of the best radiators in northern NH will likely see lows in the 30s Tuesday night. Frost advisory not completely out of the question. High pressure slides offshore on Wednesday allowing for moistening return flow. This will likely keep the coast cooler on Wednesday. However, it will remain dry. The remnants of Alberto approach Tuesday and may bring some beneficial rains to the region Thursday night through Saturday. However, early indications are that this period will not be a washout. It`ll feel more summery/tropical though with dewpoints likely getting well into the 60s with showers and thunderstorms from time to time. && .AVIATION /18Z SUNDAY THROUGH FRIDAY/... Short Term /through Monday night/...VFR gives way to MVFR tonight in cigs with lcl IFR in -dz and fog and sct -shra. On Monday...improving to VFR throughout btw 15 and 18z with sct MVFR aft 20z in mtn -shra. Long Term...VFR conditions expected Tuesday through Thursday. Could see lower conditions develop Thu night and Fri with increased tropical moisture expected. && .MARINE... Short Term /through Monday Night/...Marginal SCA winds gusts continue through early evening otherwise SCA seas for the balance of the night into the day Monday. I`ve extended the SCA through late tonight and expect it`ll be extended into the day on Monday for hazardous seas. Long Term...Conditions are expected to remain below SCA thresholds Tuesday through Saturday. && .FIRE WEATHER... Moist onshore flow will continue into Monday. The rest of the week looks warm, with light winds, and moderate humidity. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...Small Craft Advisory until 6 AM EDT Monday for ANZ150-152-154. && $$ NEAR TERM...Schwibs SHORT TERM...Schwibs LONG TERM...Ekster

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