Area Forecast Discussion
Issued by NWS Portland, ME
Issued by NWS Portland, ME
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677 FXUS61 KGYX 051927 AFDGYX Area Forecast Discussion National Weather Service Gray ME 327 PM EDT Fri Jul 5 2024 .SYNOPSIS... Scattered thunderstorms move into the region this evening with storms becoming more widespread by Saturday morning. Some patchy dense fog is also possible, especially along the coast through tomorrow morning. Scattered thunderstorms move through ahead of a cold front tomorrow afternoon, with the front moving through tomorrow night and Sunday. High pressure builds in by early in the week, with a tranquil Monday and Tuesday. More storms are possible by Tuesday night as the next cold front approaches. && .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/... A weak stalled frontal boundary is slowly lifting northward through the area this afternoon as a weak warm front, bringing in warmer and more humid air, as well as kicking off some scattered showers and thunderstorms. These continue to increase in coverage through the late afternoon and into the evening hours. The best coverage looks to be across northern areas and the higher terrain. A second area of showers and storms is likely to develop across southern New Hampshire this afternoon, and is already starting to show up on radar. These gradually drift eastward along the coastline through the evening hours, and into the overnight hours. They may weaken a bit, but increase in coverage through the overnight as forcing improves slightly ahead of a cut off low across the Great Lakes. This keeps the chance of showers ongoing most of the night across Maine, while New Hampshire mostly dries out after the evening activity. A humid night is expected across the area, with low mainly ranging from the mid 60s to the low 70s. Fog along the immediate coastline likely spreads inland through the late evening hours, and lingers through daybreak tomorrow. && .SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/... After a bit of a break during the morning hours, showers and storms increase by late morning across western areas as a cold front approaches from the west. There remains some disagreement amongst the high res guidance as to how expansive the morning convection will be. Should it be less, we likely see better heating through the midday hours, allowing for more instability and a better chance of some stronger storms during the afternoon hours. Scattered storms look likely, but how strong and widespread they become remains a bit uncertain. Either way, more showers and storms move eastward through the afternoon as the front approaches, likely reaching the coastline by the early afternoon hours. It looks like the rain mostly ends by the late afternoon, bringing a drier period for the late afternoon. Conditions remain humid overnight tomorrow night, with patchy fog developing in many spots. Relatively drier air doesn`t begin to arrive until near daybreak on Sunday, and moreso during the day on Sunday. && .LONG TERM /SUNDAY THROUGH FRIDAY/... ---------------------------------------------------------------- Summary: *Temperatures expected to run above average through early next week. *Pleasant weather likely on Monday, through scattered storms return by Wednesday. ----------------------------------------------------------------- Discussion: A low finally exits the region Sunday morning, bringing generally clearing skies and perhaps a stray thunderstorm over central Maine. High pressure builds just to the southeast over the Atlantic, ushering in hot and moist air through Tuesday. The period of hotter weather concludes by Wednesday, when a low moves across the region, bringing showers and thunderstorms. The end of the week looks generally on the more pleasant side but a stray shower / thunderstorm remains a possibility. Aviation: Generally a quiet period for aviators, but lower flight restrictions are likely with showers and thunderstorms Tuesday night and Wednesday. Some patchy morning fog is also possible in the Midcoast and CT river valley on Monday and Tuesday. The fog could impact sites RKD, LEB, CON, and MHT. Marine: Light southwesterly flow with 3-5 foot seas is expected to start the day on Sunday, with winds and seas gradually decreasing throughout the day as a low exits the region. Quiet seas and light winds are expected through Tuesday morning. Another incoming low will then increase seas and winds during the day Tuesday, with southerly SCA level winds possible by the end of the day and likely continuing through Wednesday night. && .AVIATION /19Z FRIDAY THROUGH WEDNESDAY/... Short Term...Scattered showers remain possible across interior terminals this afternoon, with low probs for showers along coastal terminals this evening. Marine fog brings IFR to LIFR to the coastal terminals and AUG by the evening hours, and lingers into at least mid morning tomorrow. Fog is also likely for a brief time across interior terminals later tonight. Fog becomes mainly low stratus along the coast, and lingers most of the day tomorrow, with interior terminals seeing MVFR to VFR conditions return. Showers and storms are likely during the afternoon hours at all terminals. Fog then clears after the rain in the late afternoon, but then valley fog is likely at most terminals tomorrow night. Long Term... Generally a quiet period for aviators, but lower flight restrictions are likely with showers and thunderstorms Tuesday night and Wednesday. Some patchy morning fog is also possible in the Midcoast and CT river valley on Monday and Tuesday. The fog could impact sites RKD, LEB, CON, and MHT. && .MARINE... Short Term...Locally dense fog lingers into tomorrow night. Freshening southwesterly winds ahead of an approaching cold front may bring brief gusts to 25kt tomorrow afternoon and evening. The front slowly clears the waters tomorrow night and on Sunday. Long Term... Light southwesterly flow with 3-5 foot seas is expected to start the day on Sunday, with winds and seas gradually decreasing throughout the day as a low exits the region. Quiet seas and light winds are expected through Tuesday morning. Another incoming low will then increase seas and winds during the day Tuesday, with southerly SCA level winds possible by the end of the day and likely continuing through Wednesday night. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ SYNOPSIS...Palmer NEAR / SHORT TERM...Clair LONG TERM...Palmer AVIATION / MARINE...Clair/Palmer