Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 202155 AFDGYX Area Forecast Discussion National Weather Service Gray ME 555 PM EDT Tue Jun 20 2017 .SYNOPSIS... A drier and cooler air mass will move into the area tonight. Another weak trough will move across the area Wednesday and will be accompanied by scattered showers and maybe a few thunderstorms across central and northern areas. High pressure will build in behind the front Wednesday night and Thursday with more dry air and seasonable temperatures. The next more significant system approaches late Thursday night into Friday bringing a return to unsettled weather into the weekend. High pressure will follow for the remainder of the weekend and into early next week. && .NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...
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555 PM Update...Have updated PoP and weather for the next few hours based on trends in radar data and mesoscale model guidance. We still expect widely sct showers and perhaps a few rumbles into the early evening hours, especially over the far interior. However, loss of daytime heating will bring an end to these around sunset. Previously... A weak cold front is currently moving across the region with the wind becoming west to southwest and lowering the dewpoints back into the 50s. A few widely scattered showers late this afternoon mainly in the mountains and foothills will come to an end by early evening. Overnight drier and cooler conditions can be expected with temperatures falling into the 50s.
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&& .SHORT TERM /6 AM WEDNESDAY MORNING THROUGH WEDNESDAY NIGHT/... Wednesday another weak trof traveling along the west flow aloft will move across the area in the morning and early afternoon allowing showers and even a few widely scattered thunderstorms across mainly central and northern areas of the forecast area. By late in the day the trof will exit the region with clearing. High pressure will build in behind the trough Wed night with another dry and seasonably comfortable air mass. && .LONG TERM /THURSDAY THROUGH TUESDAY/... Models are in fairly good agreement through the period, although there are slight differences in timing. A ridge of high pressure will cross the region Thursday with mostly sunny skies. Temperatures will reach the 70s across most of the area with low 80s in southeastern New Hampshire and southwestern Maine. As the ridge moves east Thursday night, warmer air and more humid air will return to the region...along with an increasing threat of showers and thunderstorms. Initially the shower threat with be from a frontal system approaching from the west. However, by Friday night, Gulf moisture streaming northward from the east side of T.S. Cindy could interact with the frontal boundary and bring a period of moderate to heavy rain...which could persist into Saturday morning. As the front pushes east Saturday, skies should become partly cloudy with decreasing humidity. For Sunday into early next week, high pressure building east will create a northwest flow across the region leading to cooler temperatures and lower humidity. Along with those cooler surface temperatures, the cooler temperatures aloft will allow the atmosphere to become a bit unstable, especially during the afternoons when diurnal heating will increase the threat of scattered showers. && .AVIATION /22Z TUESDAY THROUGH SUNDAY/... Short Term...VFR conditions except briefly MVFR in any scattered showers Wed. Long Term...VFR conditions expected Thursday and Thursday night. MVFR to IFR conditions will develop Friday and continue into Saturday morning. VFR conditions will return during the day Saturday and should persist through Sunday. && .MARINE... Short Term...SCA conditions over the outer waters will continue for seas near or above 5 ft tonight into Wed morning. Winds will remain light from the southwest. Seas over the outer waters subside Wed afternoon and night. Long Term...Seas will be below SCA criteria Thursday and Thursday night. Seas near 5 ft are possible Friday night through Sunday on the outer waters with seas less than 5 ft in the bays. && .TIDES/COASTAL FLOODING... Astronomical tides will be near minor flood levels this weekend. Any onshore flow or wave action could cause minor issues along the coast. At this time, the greatest threat appears to be Friday night. && .GYX WATCHES/WARNINGS/ADVISORIES...
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ME...None. NH...None. MARINE...Small Craft Advisory for hazardous seas until 11 AM EDT Wednesday for ANZ152. Small Craft Advisory until midnight EDT tonight for ANZ150. Small Craft Advisory for hazardous seas until 5 AM EDT Wednesday for ANZ154.
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