Cape Elizabeth ME to Merrimack River MA Marine Forecast
| Today...Nw Winds 10 To 15 Kt With Gusts Up To 25 Kt. Seas 2 To 4 Ft. Wave Detail: S 4 Ft At 7 Seconds And W 2 Ft At 3 Seconds. |
| Tonight...Nw Winds 10 To 15 Kt, Becoming W 5 To 10 Kt After Midnight. Seas 2 To 3 Ft. Wave Detail: Nw 2 Ft At 3 Seconds And Se 2 Ft At 7 Seconds. |
| Mon...W Winds 5 To 10 Kt, Becoming S In The Afternoon. Seas Around 2 Ft. |
| Mon Night...S Winds 10 To 15 Kt. Seas 2 To 3 Ft. Wave Detail: S 2 Ft At 4 Seconds. |
| Tue...S Winds 5 To 10 Kt, Becoming Se 10 To 15 Kt With Gusts Up To 20 Kt In The Afternoon. Seas 2 To 3 Ft. Wave Detail: Se 3 Ft At 5 Seconds. |
| Tue Night...Se Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas 3 To 4 Ft. Wave Detail: Se 4 Ft At 6 Seconds. Showers With A Chance Of Tstms. |
| Wed...S Winds 10 To 15 Kt, Increasing To 15 To 20 Kt In The Afternoon. Seas 4 To 6 Ft. Showers In The Morning, Then Showers Likely With A Chance Of Tstms In The Afternoon. |
| Wed Night...Sw Winds 10 To 15 Kt With Gusts Up To 25 Kt. Seas 5 To 7 Ft. Showers Likely With A Chance Of Tstms In The Evening, Then A Chance Of Showers After Midnight. |
| Thu...W Winds 5 To 10 Kt, Becoming S In The Afternoon. Seas 3 To 5 Ft. A Chance Of Showers In The Morning. |
| Thu Night...Sw Winds 5 To 10 Kt, Becoming Nw After Midnight. Seas 2 To 4 Ft. Winds And Seas Higher In And Near Tstms. |
| Area Forecast Discussion National Weather Service Gray ME 656am EDT Sunday July 19 2026 .WHAT HAS CHANGED... No major changes were needed for this forecast package. .KEY MESSAGES... 1. Expect seasonable temperatures and breezy northwest winds today with dry and pleasant weather on Monday. 2. Several rounds of downpours/thunderstorms Tuesday-Wednesday evening. Pleasant, seasonable temperatures through the end of the period. KEY MESSAGE 1 DESCRIPTION... Winds will shift to out of the northwest behind a cold front this morning, becoming breezy through the afternoon. Gusts up to 35 mph will be possible. Any early morning showers should move out to sea fairly quickly, but we could see a few lingering showers and clouds over the mountains. Any remaining wildfire smoke should also move out this morning and the pattern should give us a break from it's return for at least a couple of days. Highs will be around seasonable averages for this time of year, ranging from the mid 60s to lower 70s north, to the mid to upper 70s most elsewhere. A few lower 80s are likely over southeast New Hampshire and coastal Maine. Tonight's lows will mainly range from the upper 40s to the upper 50s. High pressure moves in on Monday, leading to lighter winds, dry weather, and slightly warmer temperatures. Highs will mainly range from the low to mid 70s north, to the low to mid 80s south. KEY MESSAGE 2 DESCRIPTION... A slow moving, but deep trough, digs into the Northeast. Deep southwest flow aloft will really transport in a juicy environment. This will set the stage for scattered downpours as early as Tuesday afternoon, but more likely from Tuesday night- Wednesday night. With hi-res guidance just beginning to come into range, can see a bit of a convective augmentation to this rainfall event. Therefore, will likely have a few waves of heavy precipitation across the forecast area, with some drier periods too. Mean guidance shows PWATs (Precipitable Waters) surging to 1.50-1.90", which is at or above the 90th percentile of climatology. In addition, some deterministic output is suggesting robust IVT transport from the Gulf Coast states. All this is to say there will be a moist environment favoring efficient rainfall in place. Have seen Quantitative Precipitation Forecast lower on NBM since yesterday, but it is still advertising a healthy inch region- wide. This slight drop is likely due to a more scattered nature to the rain. Overall not a strong signal for robust/organized convection, given weak low-level shear, CAPE, and general slow/pulsy storm motions. Do see a modest severe signal emerging on Wednesday. Will likely need some morning destabilization to realize the 1000 J/Kg MUCAPE that some guidance is indicating, so as is typically the case with convective setups around here, "stay tuned". Should generally have near seasonable temperatures this upcoming week. Tuesday-Wednesday will have a small diurnal range given the moisture and clouds in place. By Thursday-Friday, current expectations are a strong kick of dry westerly flow behind the trough. This looks to really dry things out, with dew points potentially dropping into the 40s. Combined with 850 mb temperatures dropping to 10-12C, dare we say a taste of early fall? The only fly in the ointment will be upstream wildfire smoke. Marine A cold front passes the waters early this morning. The passage of this front will lead to increasing southerly to southwesterly winds of 25 to 30 kts. Winds shift more offshore later this morning, remaining gusty but mostly falling below SCA (Small Craft Advisory) levels. While wave heigheights will have built 5 to 8 ft, the NW winds should knock these down to 3 to 4 ft by mid morning. High pressure builds in Monday, keeping conditions under SCA (Small Craft Advisory) levels, and then the next front brings another chance at SCA (Small Craft Advisory) conditions toward the middle of next week. NOAA Gray/Portland ME Office - Watches - Warnings - Advisories ME...None. NH...None. Marine Small Craft Advisory until 2pm EDT this afternoon for ANZ150- 152-154. |
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