524 FXUS61 KGYX 111059 AFDGYXArea Forecast Discussion National Weather Service Gray ME 659 AM EDT Sat Oct 11 2025
.SYNOPSIS... After a chilly morning, fair weather is expected today with warmer temperatures. A closed low near the Mid- Atlantic will migrate northward early next week, bringing increased rain chances Sunday night into Monday. Early week will also see building winds, seas, and surf along the coast and coastal waters.
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.NEAR TERM /THROUGH TODAY/... 7am Update...Valley fog again apparent on morning satellite imagery. A bit later than last night, but similar locations up the CT River Valley and parts of the lower Kennebec Valley. Modified tonight`s forecast fog with a little more coverage along the coast after midnight.
Previous Discussion... Cirrus passes overhead early this morning with mostly sunny skies following for the day. Southern NH may see some mid clouds passing this morning and again this afternoon, but dry air in the low levels should allow for breaks of sun. Morning mixing will bring some breeze to the area as a 925mb jet weakens and pulls northeast. The general pattern favors continued return flow as coastal high continues east. This will aid in warmer temperatures today, pushing into the mid to upper 60s.
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.SHORT TERM /TONIGHT THROUGH SUNDAY/... Winds will have slackened in the evening, with much of tonight set to be calm. Dependent on low level moisture flow, HREF develops low stratus over the coast and portions of the interior this evening. This may keep the coast to the foothills a bit more mild tonight. It may also bring fog, dense in some places. This will really be the start of a persistent easterly flow through Sunday and into early week that slowly advects more moisture into the region, with winds and surf set to increase.
Sunday begins dry, but layers of the atmosphere will begin to moisten through the day. Deeper moisture, certainty of rain, will take time to push into the region due to the steady easterly low level flow. While southerly moisture advection takes place aloft, column saturation will be uneven. This results in the chance for showers slowly increasing south to north Sunday afternoon and the evening. The increase in clouds should bring temps down a few degrees for the day with highs in the low to mid 60s.
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.LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... The coastal low will continue moving up the Eastern Seaboard on Sunday night as precipitation chances increase across mainly southern portions of our area. The low will stall out for a little while somewhere just off the Mid-Atlantic coast through early Tuesday. How far north the low tracks will determine how much rainfall we may see in our area. The latest cluster analysis would suggest there are still two general scenarios (north and south tracks), but the probability for the southern scenario (ECMWF membership heavy) has increased a bit more. It is also noteworthy that the deterministic GFS has shifted towards a more southerly track which the deterministic ECMWF has been suggesting for several runs. Being on the northern fringes of this system, spread remains very large for rainfall amounts over our forecast area as the NBM 25th to 75th percentiles still range from pretty much zero to a couple inches or more. All that said, the trend continues for a more southern track and fewer impacts up our way. As of now, the best chances (40 to 60 percent) for an inch of rain or more will be across southern New Hampshire and far southwest Maine. Given the southern trends, the east northeast winds also continue to tend down, especially over the land.
Most of the rain will likely fall late Sunday night and Monday but we could see some showers linger on Tuesday. Temperatures will be cooler Monday and Tuesday with highs mainly in the 50s and breezy northeast winds.
Another upper low and surface trough will dive down from Canada Wednesday into Thursday, bringing the next chance of showers to the area. After a modest warmup on Wednesday, cooler temperatures return through the rest of the work week.
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.AVIATION /12Z SATURDAY THROUGH WEDNESDAY/... Short Term...VFR today. Other than a breaking stratus deck in vicinity of southern NH, mostly sunny skies today with morning breeze subsiding midday. MVFR or IFR ceilings may develop late this evening and overnight for terminals along the NH and ME coast. This may also result in LIFR vis due to fog early Sunday morning. Restrictions improve, but MVFR ceilings may remain for southern NH terminals into Sunday afternoon.
Long Term...Restrictions are possible early next week, in particular along the coast and across southern NH, as a coastal low brings increasing chances of rain and gusty coastal winds.
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.MARINE... Short Term...Southerly winds continue today as high pressure pushes east of the Gulf of Maine. ENE flow increases late tonight into Sunday morning, continuing into early week. SCA conditions will arrive Sunday afternoon to points off NH/York Co, and then further up the ME coast Sunday evening. Gales may begin off the NH coast Sunday evening. This persistent wind direction due to large, slow moving low pressure to the south will also rapidly increase wave heights Sunday. For the outer coastal waters, 5 to 6 ft wave heights will be possible by the evening.
Long Term...Seas and winds continue to build Sunday night as a coastal low moves up the the Eastern Seaboard. Gales possible across the outer waters into Monday.
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.TIDES/COASTAL FLOODING... There will be a long easterly fetch for a few days late this weekend through early week. Astronomical tides will be on their way down, but combined with increased wave action, some minor coastal flooding will be possible centered around Monday.
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.GYX WATCHES/WARNINGS/ADVISORIES... ME...Frost Advisory until 8 AM EDT this morning for MEZ019>021. NH...None. MARINE...Gale Watch from Sunday evening through late Monday night for ANZ154.
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NEAR TERM...Cornwell SHORT TERM...Cornwell LONG TERM...Hargrove TIDES/COASTAL FLOODING...Ekster
NWS GYX Office Area Forecast Discussion