Area Forecast Discussion
Issued by NWS Portland, ME
Issued by NWS Portland, ME
273 FXUS61 KGYX 301835 AFDGYX Area Forecast Discussion National Weather Service Gray ME 235 PM EDT Sat Aug 30 2025 .SYNOPSIS... An upper level low pressure will slowly pinwheel across the Northeast through Monday. Scattered afternoon showers and likely again Sunday, becoming less more likely to shift east of the area by Monday. Some seasonable days and chilly nights are expected through Monday night before a return to normal through the rest of the week. Once high pressure firmly takes control Monday the forecast remains dry until Thursday night or Friday when the next frontal boundary attempts to cross the area. && .NEAR TERM /THROUGH TONIGHT/... Upper low over SE Quebec continues to pivot NE tonight. It will transition into the overall longwave pattern aloft into Sunday, so its cool and cloudy influence is short-lived. It remains cloudy across the mountains tonight as the backside of the merged trough carries low level moisture into the region. Elsewhere, mostly clear skies develop into the late evening hours. As clouds thin, expect good radiational cooling overnight with most locations dipping into the mid 40s. && .SHORT TERM /SUNDAY THROUGH SUNDAY NIGHT/... Drier NW flow behind the departing disturbance will provide a sunnier day on Sunday. Shallow cumulus should develop late morning, while a sprinkle can`t be ruled out towards Jackman and the western ME mountains. Overall expect footprint of clouds to be much smaller than Saturday. Overnight, mostly clear skies and calm winds will again promote a cool night as high pressure moves into the Northeast. Went lower than NBM guidance on some typical cool spots with lows in the lower 50s to mid 40s. && .LONG TERM /MONDAY THROUGH SATURDAY/... Key Message: Temps below normal to start the period but turning more seasonable thru the remainder of the week. Continued dry until the last week frontal passage. Impacts: No significant weather impacts anticipated beyond maintaining/deepening drought conditions. Forecast Details: The core of the cold anomalies begin to lift out Mon...so moderating conditions are expected thru the remainder of the week. Surface high pressure will be hanging on thru Mon night however...and I did adjust some of the interior valleys down a few degrees to account for lingering radiational cooling effects. I also continued to add valley fog in the forecast as long as high pressure is in control. While we have been very dry...the recent rain...evapotranspiration...and climatological peak of radiation fog all suggest at least patchy fog possible. The main story continues to be the lack of rain in the forecast. After the drink yesterday there is not much rain to speak of until at least Thu night or Fri. A cold front will cross the region but forcing will be weakening with time and by no means is this a lock for wetting rains. Drought conditions may continue to expand. && .AVIATION /18Z SATURDAY THROUGH THURSDAY/... Short Term...SHRA, maybe a rumble of TS, through late afternoon for interior terminals. Some SHRA makes it towards RKD through mid afternoon. Cumulus deck deteriorates this evening with mostly clear skies outside of the mountains. This may lead to valley fog development after midnight. MVFR takes hold along the US/CAN border overnight into Sunday morning. Trend should be towards VFR for Sunday. Clear skies Sunday night, but valley fog may again develop. Long Term...Generally VFR conditions thru the extended. Local IFR or lower in valley locations where fog is expected. Given the dry weather this may stay limited to HIE and LEB. && .MARINE... Short Term...Breezy today as upper low pressure pivots from SE Quebec to eastern ME tonight. Wave heights build Sunday, but remain 1 to 3 ft for the coastal waters. Long Term...Ridging and surface high pressure will remain in control and dominate weather thru the end of next week. As a result winds and seas are expected to remain below SCA thresholds. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ NEAR TERM...Cornwell SHORT TERM...Cornwell LONG TERM...Legro/Schroeter AVIATION...Cornwell/Legro MARINE...Cornwell/Legro