Area Forecast Discussion
Issued by NWS Portland, ME
Issued by NWS Portland, ME
188 FXUS61 KGYX 280615 AFDGYX Area Forecast Discussion National Weather Service Gray ME 215 AM EDT Thu Aug 28 2025 .SYNOPSIS... High pressure moves off the East Coast today. A cold front and low pressure then approach Friday, bringing an increasing potential for showers and scattered thunderstorms. The front crosses east of the area by Saturday, but scattered daytime showers remain possible over the weekend as an upper low crosses the region. High pressure moves into the region late weekend, and remains in place through at least midweek next week. && .NEAR TERM /THROUGH THURSDAY/... High pressure moves off the East Coast south of New England today, bringing a slight moderating trend. Temps will be notably warmer across the north today than the last couple day, with highs in the mid to upper 70s across most of northern New England. A south wind freshens through the daytime as a cold front approaches from the west. This knocks temps back along the coast this afternoon, as well as spreads some high cloud cover across western New Hampshire by late this afternoon. && .SHORT TERM /THURSDAY NIGHT THROUGH FRIDAY/... Clouds steadily increase through the overnight as the front approaches. This keeps temps warmer overall than the last couple of nights, with lows generally in the mid 40s to low 50s across most of the interior. Across southeast New Hampshire and the coastline, a south wind persist through the overnight, keeps lows in the upper 50s to near 60. A few showers likely reach the Connecticut River Valley by sunrise tomorrow morning, but the bulk of the activity will hold off until after sunrise. Tomorrow looks to be the rainiest day we have seen in a while as a vigorous shortwave digs into the Great Lakes and Quebec. Rounds of showers and storms develop by mid morning, pivoting across the region through the daytime. With cold air aloft, these storms have the potential to bring some gusty winds and small hail, as well as frequent lightning. Multiple rounds are expected throughout the day, with spots that see repeat storms seeing locally more rainfall than the general 0.25-0.75 in the forecast. Storms are likely to weaken during the evening. However, with cold air continuing to move in aloft through the overnight, showers and some weaker storms are likely to continue through the evening and into the overnight hours. && .LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/... Early morning long term update...No significant changes were made with the incorporation of the 01z NBM. Upper troughing will be the rule throughout the entire extended but little in the way of meaningful rainfall is currently forecast. Previously... Low pressure begins to slow and stack over Quebec Friday night into Saturday, cutting off from main transport. With cooler air aloft creating favorable lapse rates, believe scattered showers will be around for much of Saturday, mainly in the mountains and foothills. Thin dry slot may work its way into the coast and interior to limit coverage here. Coverage decreases after sundown. Outside of the initial push of moisture, high pressure will bring more continental dry airmass into the region for Sunday and into early next week. Temperatures trend to around normal for late August and early September. && .AVIATION /02Z THURSDAY THROUGH MONDAY/... Short Term...LIFR conditions in valley fog at HIE and LEB improves to VFR by mid morning. VFR then prevails at all terminals through tomorrow morning. Several rounds of showers and storms bring brief periods of restrictions to all terminals starting by late morning on Friday. These continue into the evening hours. Mainly VFR to MVFR conditions are expected outside of the showers and storms. Long Term...Showers remain possible over the weekend, mainly during the days, with the low pressure lingering across the area but mainly VFR expected. && .MARINE... Short Term...High pressure moves east of the waters today. Southerly winds freshen ahead of cold front today, but remain below SCA conditions through tomorrow. Showers and storms cross the waters ahead of the front during the day on Friday, with some gusty winds and small hail possible. Long Term...Cold front crosses Saturday with a wind shift to the west or northwest. High pressure builds across the waters from Sunday into early next week with conditions staying expected to stay below SCA levels. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ NEAR TERM...Clair SHORT TERM...Clair LONG TERM...Cornwell/Ekster