Casco Bay Marine Forecast
| Tonight...Sw Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas 2 To 3 Ft. |
| Mon...Sw Winds 15 To 20 Kt With Gusts Up To 25 Kt. Seas 2 To 4 Ft. |
| Mon Night...Sw Winds 10 To 15 Kt With Gusts Up To 25 Kt, Becoming Nw 5 To 10 Kt After Midnight. Seas 2 To 4 Ft. |
| Tue...E Winds 5 To 10 Kt. Seas 2 To 4 Ft. A Chance Of Rain In The Morning, Then Rain Likely In The Afternoon. |
| Tue Night...E Winds 5 To 10 Kt, Becoming S 15 To 20 Kt After Midnight. Seas 2 To 4 Ft. Rain Likely. Patchy Fog. Vsby 1 To 3 Nm. |
| Wed...Sw Winds 15 To 20 Kt With Gusts Up To 30 Kt. Seas 3 To 5 Ft. Patchy Fog In The Morning. Rain Likely In The Morning, Then Showers Likely In The Afternoon. Vsby 1 To 3 Nm In The Morning. |
| Wed Night...N Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas 3 To 5 Ft. A Chance Of Rain. |
| Thu...Ne Winds 10 To 15 Kt, Diminishing To 5 To 10 Kt In The Afternoon. Seas 2 To 4 Ft. A Chance Of Rain. A Chance Of Snow In The Afternoon. Vsby 1 To 3 Nm. |
| Thu Night...E Winds 5 To 10 Kt, Increasing To 10 To 15 Kt After Midnight. Seas 2 To 3 Ft. A Chance Of Rain And Snow In The Evening, Then Rain And Snow Likely After Midnight. Vsby 1 To 3 Nm. |
| Fri...E Winds 10 To 15 Kt With Gusts Up To 25 Kt. Seas 2 To 4 Ft. Rain And Snow Likely In The Morning, Then Rain Likely In The Afternoon. Vsby 1 To 3 Nm In The Morning. |
| Fri Night...Ne Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas 2 To 4 Ft. Rain Likely, Mainly In The Evening. |
| Area Forecast Discussion National Weather Service Gray ME 752pm EDT Sunday Mar 29 2026 .WHAT HAS CHANGED... Minor update to reflect observed trends in the near term. .KEY MESSAGES... 1.Warmer air continues to make a push into Northern New England, while a series of fronts begin to make southward progress by late Monday. 2. An active weather pattern sets up from Tuesday into next weekend, bringing multiple opportunities for widespread precipitation. Except for the possibility of a period of mixed precipitation in the mountains, mostly rain is expected Tuesday into Wednesday. The following system may feature a better chance for wintry precipitation for areas south of the mountains Thursday into Friday. KEY MESSAGE 1 DESCRIPTION... The moderating trend continues through tomorrow as southwesterly flow brings warmer air into New England. Lows tonight will be notably warmer than the last few nights, with lows ranging from the mid 20s across the north, to upper 30s through the New Hampshire Seacoast. Tomorrow looks to feature the most widespread warmth across the area for the week, with northern areas likely seeing their warmest readings of the week. Southern areas stand a better chance for higher temps Tuesday or Wednesday. But tomorrow, highs warm into the 60s across much of the area, with 50s more common across the north. Sunshine peaks midday after morning clouds move offshore, and before more clouds begin to move in during the afternoon hours. However, the cooler air will already be making southward progress during the day tomorrow. A few showers are possible near the Canadian border tomorrow morning as a warm front lifts north of the area. Then by the afternoon, first a trough and then a cold front press into northern areas, bringing increasing clouds and scattered showers. Cooler air begins to move into northern areas overnight with lows in the 20s, while central and southern locations remain in the warm air mass with overnight temps in the 30s and 40s. The front likely stalls in our forecast area by early Tuesday, bringing increasing showers chances toward daybreak as more moisture rides along the front from the west. KEY MESSAGE 2 DESCRIPTION... Monday's backdoor cold front will lift back north as a warm front Tuesday into Tuesday night as a wave of low pressure ride along the boundary, bringing a round of widespread overrunning precipitation with strong isentropic lift. How fast the boundary lifts north is uncertain and whether a cold air dam sets up, which could result in a large spread in temps from southern NH to western ME, but regardless, temperatures do look to be warm enough to support mostly rain, even if end up being it's a cold rain in some areas. The exception may be in and around the mountains, where a period of freezing and sleet can't be ruled out if surface temps do trend colder. The column will likely continue to warm overnight, which will end any wintry precipitation in the mountains if it does occur. Ensemble means support 0.50" to 1.00" of Quantitative Precipitation Forecast possible from the foothills northward and 0.25" to 0.50" to the south from Tuesday into Tuesday night. Models are in good agreement with most of northern New England in the warm sector by Wednesday morning as low pressure tracks to the east across the Canadian Border and central Maine, which will send a cold front through in the afternoon. Despite mostly cloudy skies, the increasing west to southwest flow ahead of the front should bring a warm day for most areas south of the moutnains..well into the 50s and 60s possibly low 70s in southern NH if the front is a little slower. As the front moves through, there will be a chance of showers and maybe even a couple of storms (esp if the front is slower) across southern NH and southwest ME. However, convergence on the front may not be great with the southwest flow. This front will come into play as it looks to stall out near or just south of the region going into late week with waves of low pressure riding along it. There's a better signal for CAD to lock in the colder air in the low levels north of wherever the boundary hangs up with high pressure to the north and east. There's also a strong signal in the ensembles for widespread precipitation (but not so much agreement on Quantitative Precipitation Forecast) Thursday into Friday, but if this set up comes through, it could bring some wintry precipitation including freezing rain and/or sleet south of the mountains as well. So we'll have to monitor how things unfold. For the weekend, Saturday might be dry, but there's already good model agreement with low tracking across Canada with a cold front approaching from the west increasing precipitation chances going into Sunday. There are a few colder ensemble members, but most currently favor rain as the ptype. Marine Increasing southwesterly winds ahead of a cold front bring SCA (Small Craft Advisory) conditions to the outer waters through at least Monday evening. Some marginal gale force gusts are possible across the far eastern waters Monday afternoon. Tuesday-Sunday...An active pattern will support several periods of SCA (Small Craft Advisory) conditions across the waters as multiple fronts and low pressures trek across the region. The first is Tuesday into Wednesday as low pressure approaches from the west and sends a cold front through the waters on Wednesday. A period of gales may occur but confidence is low. Multiple waves of low pressure look to ride along this boundary through late week, which may lift back north or stall out just south of the waters. A cold front approaches from the west over the weekend with increasing southerly flow out ahead of it. NOAA Gray/Portland ME Office - Watches - Warnings - Advisories ME...None. NH...None. Marine Small Craft Advisory until midnight EDT Monday night for ANZ150-152-154. |
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