Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 280231 AFDGYX Area Forecast Discussion National Weather Service Gray ME 1031 PM EDT Thu Apr 27 2017 .SYNOPSIS... A weakening area of low pressure over the Gulf of Maine will continue to drift northeast into tonight. This will prolong the cool damp conditions over all but far western and northern New Hampshire into tonight. A front accompanied by showers will move across the region Friday morning and will help to sweep out the cool and wet conditions with warmer temperatures Friday afternoon and into the weekend. That may be short lived however...as cooler air tries to slip back in from the north Sunday into Monday while low pressure approaches from the south. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/... 1020 PM...Pushed patchy drizzle further south to the coast overnight, as we are seeing a some here at WFO GYX, and KGYX radar showing some weak echoes between the foothills and the coast. Also made some temp adjustment based on current obs. Temps near the coast, in the marine lyr are in the upper 40s, as dew points, so do not expect much change here. Further inland and to the west Tds in the mid-upper 50s, and although they may drop off a little, have increased mins a bit in some areas generally in the low to mid 50s. 620 PM...In this forecast updated pops a bit, more to reflect some DZ developing in the SE upslope areas of the mountains/foothills, especially in ME. Should see some fog develop on the coastal plain and in the upslope areas as well. Temps on the coast, already in the marine lyr will see drop overnight and should be around or a little above 50. Inland areas will see temps drop to 50-55. Previously...Weak frontal boundary moves through from west to east late tonight into Friday morning, and could spawn some showers and perhaps an isolated storm. Front is weakening as will not be a big precip producer. However, as the front moves through, expect the low clouds and gloom to finally abate either Friday morning in New Hampshire or around midday Friday as one heads further east toward Augusta and Rockland. && .SHORT TERM /6 AM FRIDAY MORNING THROUGH 6 PM FRIDAY/... Quiet weather expected Friday night with increasing clouds as a weak progressive 500mb shortwave brings showers to the region for the beginning of the weekend Saturday morning. Showers look scattered in variety and instability still looks weak at this point, thus left any mention of thunder out. It will remain warm and moist though with dewpoints still in the 50s for most areas. Saturday night a weak cold front pushes through ushering in drier and cooler air for Sunday. && .LONG TERM /FRIDAY NIGHT THROUGH THURSDAY/... Overall Sunday looks to be seasonable with highs mostly in the low 60s, with clouds increasing through the afternoon hours as a warm front quickly pushes back north with return flow becoming established. Rain chances will be on the increases Sunday night into Monday as the warm front pushes back north. Currently looks like the best chance for heavier precipitation across is across Northern New Hampshire and the Western Mountains of Maine. Showers to continue Tuesday into Wednesday as a cold front pushes through by mid-week with drier and cooler weather possible once again by Thursday. && .AVIATION /03Z FRIDAY THROUGH TUESDAY/... Short Term... IFR or worse tonight areawide in low clouds and fog. Conditions improving to VFR from west to east during the day Friday behind a frontal boundary. Long Term...Showers expected on Saturday morning, with limited impacts to aviation operations expected. High pressure in control on Sunday with rain and MVFR ceilings possible once again by Sunday night. Lower clouds and visibilities possible by Monday. && .MARINE... Short Term... Small craft for seas remains in effect through Friday. Long Term...Winds speeds will be on the increase across the waters during the day on Saturday with westerly flow turning offshore by Saturday night. Seas will generally run in the 2 to 4 foot level. Seas and winds will be on the increase Monday night into Tuesday with SCA conditions possible with south to southwest winds over the waters. && .FIRE WEATHER... Damp conditions with light winds persist into early Friday. A front on Friday could bring a tenth of an inch of rain or so late tonight or Friday morning. Lower relative humidities behind the front late Friday into the weekend. && .TIDES/COASTAL FLOODING... A Coastal Flood Advisory is in effect for later this evening through early Friday morning due to the persistent light onshore flow combining with the highest astronomical high tides of this cycle. High tide at Portland is 11.7ft at 12:42am Friday. Storm surge will run close to a half foot at time of high tide. Some splash over and beach erosion will be possible through the early morning hours. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...Coastal Flood Advisory until 3 AM EDT Friday for MEZ023-024. NH...Coastal Flood Advisory until 3 AM EDT Friday for NHZ014. MARINE...Small Craft Advisory for hazardous seas until 8 PM EDT Friday for ANZ150-152-154. && $$ SYNOPSIS... NEAR TERM...Cempa SHORT TERM... LONG TERM... AVIATION... MARINE... FIRE WEATHER... TIDES/COASTAL FLOODING...

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