Area Forecast Discussion
Issued by NWS Portland, ME
Issued by NWS Portland, ME
044 FXUS61 KGYX 070639 AFDGYX Area Forecast Discussion National Weather Service Gray ME 239 AM EDT Sun Sep 7 2025 .SYNOPSIS... A cold has stalled along the Northeast coast with showers expected to ride north along that boundary through much of today. The light rain will be welcomed but total amounts will not be high enough to relieve the drought conditions. Heading into Monday high pressure builds in and sets up our next stretch of pleasant but dry weather. Some chilly nights will be in store under mostly clear skies but the daytime temperatures should recover to near normal. && .NEAR TERM /THROUGH TODAY/... Early morning surface analysis places a cold front along the Eastern Seaboard with water vapor imagery showing another short wave pivoting across the Great Lakes. This stalled front will provide a focus for clouds and light showers through sunrise. The approaching short wave will spread forcing for ascent over the area later this morning with a wave of low pressure forming on the stalled boundary. As this wave of low pressure tracks through the Gulf of Maine more widespread showers will blossom bringing a soaking rain for areas mainly south of the mountains. Additional rainfall amounts will range from around a quarter of an inch in the mountains to around 0.75 inches along coastal Maine into SE NH. Drier air will move in from the NW this afternoon with shower chances diminishing from NW to SE into early this evening. Cloudy skies and northeast winds through the morning will keep highs mainly in the 60s today. && .SHORT TERM /TONIGHT THROUGH MONDAY/... Light west to northwest flow tonight will advect drier air into the region with skies turning mostly clear. This will allow for temperatures to drop into the 40s across much of the area for low temperatures. High pressure over the Ohio Valley will build into New England Monday providing fair weather with steady west winds. Highs will range from the 60s north to mid 70s across coastal Maine through southern NH. && .LONG TERM /MONDAY NIGHT THROUGH FRIDAY/... Key Messages: Near to slightly below normal temps thru the extended...but dry weather is expected and deepening drought conditions. Impacts: Another extended period of dry weather will likely result in expanding drought conditions. Mon night may see patchy frost in the northern valleys. Forecast Details: High pressure will build into the region and more or less hold thru the remainder of the extended. The set up will be favorable for strong radiational cooling. High pressure will also have origins over central Canada...and even with some moderation as it passes over the Great Lakes should have a little more potential to be colder than our last stretch of high pressure. So Mon night I did blend in some MOS guidance so get the northern valleys down in the mid 30s. We may have to add frost to the forecast for those zones in subsequent updates. Otherwise the main story is that there is little precip to mention thru the end of the forecast period. Aside from some showers that skirt the coastal waters...it should be dry over land. Even with the rainfall today that will likely lead to expanding drought conditions. && .AVIATION /03Z SUNDAY THROUGH THURSDAY/... Short Term...Low pressure riding along a front stalled along the coast will bring more widespread showers and lowering cigs this morning into early afternoon. This will likely bring MVFR to IFR conditions along a line from KCON to KAUG and points southeast. Winds shift out of the west this evening with drier air allowing for improving conditions tonight from NW to SE. VFR is likely for sites on Monday. Long Term...VFR conditions are expected through the long term forecast period as high pressure dominates regional weather. Valley fog is likely in at least the northern valleys each night...and IFR conditions are possible at both HIE and LEB. The recent dry weather may limit coverage of fog in valleys farther south. High pressure will also help to promote afternoon sea breezes...so I anticipate wind shifts for coastal terminals around midday. && .MARINE... Short Term...Winds and seas will remain below SCA thresholds throwout the period. A stalled front over the waters will proved a focus for low clouds and showers through much of today with high pressure building in on Monday. Long Term...Winds and seas expected to remain below SCA thresholds with high pressure in control. Aside from some isolated showers midweek skirting the coastal waters...sea breezes during the afternoons will pretty much be it for weather. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ NEAR TERM...Schroeter SHORT TERM...Schroeter LONG TERM...Baron/Legro AVIATION...Legro/Schroeter MARINE...Legro/Schroeter