Area Forecast Discussion
Issued by NWS Portland, ME
Issued by NWS Portland, ME
358 FXUS61 KGYX 221833 AFDGYX Area Forecast Discussion National Weather Service Gray ME 133 PM EST Sat Nov 22 2025 .SYNOPSIS... High pressure builds in tonight into Sunday morning. The next disturbance crosses Sunday night bringing mainly snow showers to the mountains. High pressure returns Monday into Tuesday while an area of low pressure develops over the Great Lakes. This low pressure system will slowly track into SE Canada lifting a warm front into New England Tuesday night followed by the attendant cold front crossing Thursday. Cooler and breezy conditions then follow to close out the week. && .NEAR TERM /THROUGH TONIGHT/... Shortwave within cyclonic flow moving into the region will continue scattered snow showers across the northwestern mountains and valleys. Some of these are causing brief visibility reductions below 2 miles, but should taper off early this evening. Winds are also picking up with the passage of this wave, with some gusts to around 25 mph at times. Also expect these gusts to taper off later, but it should remain breezy a little after sunset. This breeze will bring cooler temps back in, but will prevent early decoupling for radiational cooling tonight. Think NBM had some good low temps all things considered, but temp trend cooler will be weak at first. Best rad cooling may not happen until closer to midnight with clear skies for all but the mountains. All in all, lows in the lower 20s with some teens seem most likely. High clouds begin to move back into the region before sunrise. && .SHORT TERM /SUNDAY THROUGH SUNDAY NIGHT/... Midlevel jet moves over the Great Lakes Sunday morning, with weak low pressure moving into northern New England. It will mostly bring cloudiness to the region as the prospect of notable precipitation remains low. Would expect some scattered showers or snow showers as it passes, but moisture depth is only notable later in the evening and for a short duration. Due to the clouds and early NW flow, high temps will be a couple degrees cooler than Saturday but with lighter winds. Lingering precipitation tapers last in the mountains overnight, as clouds keep overnight lows a few degrees warmer than tonight. && .LONG TERM /MONDAY THROUGH SATURDAY/... Overview: High pressure builds in Monday, but quickly shifts offshore Tuesday morning. A warm front will bring increasing chances for precipitation Late Tuesday into Wednesday with temperatures rising above normal Wednesday afternoon. A cold front crosses Thursday morning with cooler, breezy, and showery conditions to end the week. Impacts: Some slick travel will be possible in the mountains Tuesday night into Wednesday morning from light snow transitioning to a wintry mix. Forecast Details: Skies turn mostly sunny across the south Monday with snow showers diminishing in the mountains. NW winds in the wake of a clipper system will gust up to 25 mph with highs ranging from the low 30s north to mid 40s south. High pressure slides across southern New England Monday night and Tuesday morning for mostly dry weather. A warm front approaches late Tuesday with precipitation likely Tuesday night. Thermal profiles will support some light snow to start across the north with rain being the dominant p-type south of the mountains. There may be a period of a wintry mix across northern valleys Tuesday night that could bring slick travel into Wednesday morning. Temperatures are then forecast to rise above freezing after day break with chances of rain continuing through the day Wednesday. Highs on Wednesday will range from the 40s north to mid 50s south. A cold front crosses Thursday morning allowing for a change to snow showers in the mountains with mostly dry a breezy conditions south of the mountains. Cyclonic flow persists over the Northeast through the end of the week with continued chances for snow showers in the mountains. && .AVIATION /17Z SATURDAY THROUGH WEDNESDAY/... Short Term...SHSN continue across the mountains this afternoon, tapering early evening. Some gusts to 20kt expected with a NW wind shift. Gust factor decreases this evening, but breeze may continue into late evening. HIE and other mountain terminals likely to see some occasional vis reduction to 1 or 2SM this afternoon, with MVFR ceilings at times through midnight local. SKC for coastal and interior terminals tonight, with high cirrus thickening and lowering into daybreak Sunday. Light SHRASN possible late Sunday, but mainly towards the western terrain. Ceilings low to MVFR with pockets of IFR possible into Sunday night. Long Term...VFR likely prevails Monday into Tuesday. Clouds thicken and lower late Tuesday with a wintry mix breaking out near KHIE and rain elsewhere Tuesday night. This will likely bring restrictions into Wednesday morning with some improvement possible during the day Wednesday. && .MARINE... Short Term...Behind exiting cold front, a few NW gusts to 25 kt possible this evening and before midnight local. These subside Sunday morning with flow becoming SW as weak low pressure pushes into northern New England. Long Term...Conditions likely stay below SCA thresholds Monday into Wednesday. A cold front crossing late Wednesday night with bring increasing NW flow with SCAs likely needed by Thursday. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ NEAR TERM...Cornwell SHORT TERM...Cornwell LONG TERM...Schroeter