Casco Bay Marine Forecast
| Tonight...Ne Winds 15 To 25 Kt, Diminishing To 10 To 15 Kt After Midnight. Seas 4 To 6 Ft. A Chance Of Light Rain This Evening. Patchy Drizzle. A Slight Chance Of Light Rain After Midnight. |
| Tue...Ne Winds 10 To 15 Kt With Gusts Up To 20 Kt, Diminishing To 5 To 10 Kt In The Afternoon. Seas 3 To 5 Ft. |
| Tue Night...Nw Winds Around 5 Kt, Increasing To 5 To 10 Kt After Midnight. Seas 3 To 5 Ft. |
| Wed...Nw Winds 10 To 15 Kt With Gusts Up To 20 Kt, Becoming N 15 To 20 Kt With Gusts Up To 30 Kt In The Afternoon. Seas 3 To 5 Ft. |
| Wed Night...N Winds 15 To 20 Kt With Gusts Up To 30 Kt. Seas 3 To 5 Ft. |
| Thu...N Winds 15 To 20 Kt With Gusts Up To 30 Kt. Seas 2 To 4 Ft. |
| Thu Night...N Winds 15 To 20 Kt With Gusts Up To 30 Kt. Seas 2 To 4 Ft. |
| Fri...N Winds 10 To 15 Kt With Gusts Up To 25 Kt. Seas 2 To 4 Ft. |
| Fri Night...Nw Winds 5 To 10 Kt. Seas 2 To 3 Ft. |
| Sat...Nw Winds 5 To 10 Kt, Becoming Sw In The Afternoon. Seas Around 2 Ft. |
| Sat Night...Sw Winds Around 5 Kt. Seas Around 2 Ft. |
| Area Forecast Discussion National Weather Service Gray ME 147pm EDT Monday Oct 13 2025 Synopsis Broad low pressure along the Mid-Atlantic coast will showers, gusty winds, and high surf through Tuesday. The low will eventually push well out to sea by a front midweek. Cooler temperatures arrive Wednesday and Thursday, particularly for the mountains. Much warmer temperatures are foreseen this weekend. Near Term - Through Tonight As of 1730z, the center of low pressure was located off the south Jersey coast. Radar and satellite imagery are showing that dry air is getting entrained into the system which has made measurable rainfall a bit hard to come by in many areas of the CWA (County Warning Area) today. Aside from a few bands of moderate rainfall possibly occurring over southern NH this evening, this storms seems pretty much kicked in terms of moisture across New England with dry high pressure just to our north. Have lowered Probability of Precipitation for the rest of the afternoon and evening hours with mainly light showers and some drizzle expected along with occasionally gusty northeast winds. Short Term - Tuesday Through Tuesday Night Low pressure gradually moves away from Northern New England Tuesday with much lower PoPs, lighter winds, and warmer temperatures expected. Long Term - Wednesday Through Monday On Wednesday, an upper-level low develops over the Canadian Maritimes, creating a mid-level trough across the Northeast. As this trough moves southward, a weak frontal boundary also moves southward and will allow for some isolated showers to move through the area in the first half of the day Wednesday. In the wake of this front, breezy northwest winds are likely and will make the second half of Wednesday feel chilly. The development of the aforementioned upper-level low will also translate to a chilly and cloudier 2nd half of the week. Thursday will likely be the coldest day, with highs in the upper 40s and lower 50s. The breezy winds continue into Thursday and may even be a hair stronger than on Wednesday. The colder weather on Thursday will be short-lived, as a ridge slowly moves in for the weekend. Winds should be a little less breezy, and temperatures should be back into the 60s. Dry weather is expected through the 1st half of the weekend, but low pressure moves in on Sunday and should allow for a wet and unsettled early next week. Marine Short Term Large waves hang on through tonight, beginning to slowly subside on Tuesday. Gale conditions will tend to slacken late tonight. Gusts for much of the waters remain 25 to 30 kt into early Tues morning, but become less than 20kt as winds shift north then NW Tues afternoon. Long Term Northwesterly winds at 20-30kts is expected Wednesday through Friday morning. Seas should be around 4-7ft in the second half of the week. Winds and seas look to gradually slacken over the weekend with light southwesterly winds at 6-12kts and seas near 2-4ft. Tides / Coastal Flooding Steady easterly winds will build water along the coast through tonight, coinciding with high surf and astronomical tides around 10 to 10.5 ft (at CASM1). The result may bring splashover surrounding the time of high tides. NOAA Gray/Portland ME Office - Watches - Warnings - Advisories ME...High Surf Advisory until 8pm EDT Tuesday for MEZ023>027. NH...High Surf Advisory until 8pm EDT Tuesday for NHZ014. Marine Small Craft Advisory until 8pm EDT Tuesday for ANZ150-151-153. Gale Warning until 2am EDT Tuesday for ANZ152-154. |
Portland ME Radar
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