Marine Weather Net

Stonington ME to Port Clyde ME Marine Forecast




5 - 10


10 - 15


10 - 15

The Marine Weather Forecast In Detail:
ANZ150 Forecast Issued: 1027 AM EDT Mon May 20 2024

Today...Ne Winds Around 5 Kt, Becoming S Late This Morning And Afternoon. Seas 2 To 4 Ft. Wave Detail: Se 4 Ft At 8 Seconds.
Tonight...Sw Winds 5 To 10 Kt. Seas 2 To 3 Ft. Wave Detail: Se 3 Ft At 8 Seconds.
Tue...S Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas 2 To 3 Ft. Wave Detail: Se 3 Ft At 9 Seconds And S 2 Ft At 4 Seconds.
Tue Night...Sw Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas 2 To 3 Ft. Wave Detail: S 3 Ft At 4 Seconds And Se 3 Ft At 9 Seconds.
Wed...Sw Winds 5 To 10 Kt, Increasing To 10 To 15 Kt In The Afternoon. Seas Around 3 Ft. Wave Detail: S 3 Ft At 5 Seconds And Se 2 Ft At 8 Seconds.
Wed Night...Sw Winds 10 To 15 Kt With Gusts Up To 25 Kt. Seas 3 To 4 Ft. Wave Detail: S 3 Ft At 5 Seconds And Se 2 Ft At 8 Seconds.
Thu...Sw Winds 10 To 15 Kt With Gusts Up To 25 Kt. Seas 3 To 4 Ft.
Thu Night...Sw Winds 10 To 15 Kt With Gusts Up To 25 Kt. Seas 3 To 4 Ft. A Chance Of Showers.
Fri...Sw Winds Around 10 Kt With Gusts Up To 20 Kt. Seas 3 To 4 Ft. A Chance Of Showers In The Morning.
Fri Night...W Winds 5 To 10 Kt. Seas 2 To 3 Ft.
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Area Forecast Discussion
National Weather Service Gray ME
1036am EDT Monday May 20 2024

Surface high pressure moves in today and will clear things out this afternoon and then anchor itself just offshore allowing for some seasonably warm temperatures. There's a chance for some thunderstorms in the mountains late Tuesday into Tuesday night, with a better chance for showers and storms Wednesday afternoon and evening as a cold front approaches. An upper level trough will keep scattered showers over the region Friday. High pressure builds in from north over the weekend.

Near Term - Until 6pm This Evening
1035 AMThis update just served to make tweaks to the near term based on observations. The inherited forecast remains in good shape as the last remnants of this mornings low clouds are in the process of dissipating. For the remainder of the day, should just see some high clouds rolling over the ridge into our area but nothing that should keep us from realizing our forecasted highs in the 70s. Along the coast will stay cooler with a bit more in the way of clouds as cool moist onshore flow continues.

Previous 645 AM...No real changes to the forecast, just adjusted sky/fog to better reflect reality this morning. They still should all burn off by midday.

Previously...Surface high shifts offshore during today as 500 MB ridging shifts into more zonal flow by later in the day. This will allow surface flow to become more SW as flow aloft shift to the W. The stratus S and E of the mtns will begin to erode from inland first this morning, and eventually do so at the coast, but that may not be until midday or so. Also, the onshore flow near the coast will likely never shift to SSW, as it does this afternoon inland. Ultimately this will lead to a fairly wide differential in temps between the coast and inland areas, especially the CT valley where highs will reach into the upper 70s today, while inland areas S and E of the mtns should get to the low to mid 70s, and the coast will likely remain in the 60s today.

Short Term - 6pm This Evening Through 6pm Tuesday
Should stay mainly clear away from the coast through the night , and with light winds this will allow temps to fall into the low to mid 50s across much of the area, although the coast will be the coolest, as it will never get out of the marine lyr, and lows will fall to around 50. Another round of low coastal stratus is possible again late tonight, although should be limited to closer and the coast, and some models only bring into the mid-coast overnight.

On Tuesday, we line up pretty good with W flow aloft and SW flow near the sfc, and this will advect some warm mid level air into the CWA (County Warning Area) with 850 MB temps pushing 15C by the afternoon. This should be enough to push temps to 80-85 across much of the area away from the coast. Still we are likely to see see the flow shift to the S along the coast which will limit highs to 65-70 along the mid coast and 70-75 along the N-S oriented coast S of Casco Bay. There is a remnant MCS (Mesoscale Convective System, a complex of thunderstorms which becomes organized on a scale larger than the individual thunderstorms) that will be across S Quebec late in the day. 12Z model runs tend to keep this out of the CWA until Tuesday evening, but may see some convection develop ahead of it the far N late in the afternoon.

Long Term - Tuesday Night Through Sunday
Overview... A building ridge along the Eastern Seaboard brings very warm conditions for much of the week, peaking midweek. Residual convection riding around the ridge brings a few chances for showers and storms over several days, with the greatest chance on Thursday as a cold front approaches from the north. Relatively cooler air returns by late in the week and the weekend.

Details... Wednesday looks to be the peak of the heat, with temps warming into the low 90s across much of southern and western NH, and 80s elsewhere. Even the southern coastlines warm into the 80s with southwesterly flow, while the MidCoast warms into the 70s. As mentioned, there's a little less certainty across the north on high temps where leftover morning convection could limit how high temps rise. Scattered afternoon showers and storms are also likely across northern areas Wednesday afternoon. There will be another deteriorating MCS rounding the ridge again Wednesday night, but similar to the previous night's it's unclear at this point how robust this system will be by the time it reaches New England.

Thursday remains warm, but with a downward trend in temps underway. A cold front moves through during the daytime, with some showers and storms accompanying it, especially across the higher terrain. Thursday likely ends up be the warmest day for the MidCoast, with winds turning westerly in the afternoon and warming temps into the upper 70s to near 80. 80s are expected elsewhere, with one more day in the upper 80s across southern NH.

Behind the cold front, temps still look fairly warm downwind of the mountains on Friday. Temps warm into the 70s in most spots, with highs near 80 across southern NH. The mountains likely see more cloud cover and get deeper into the cooler airmass, keeping highs in the 60s.

Right now the weekend looks cooler as high pressure noses in from the north, but the warmth won't be far off to the south. The high is not overly strong, and has been trending a bit weaker since yesterday. Should this trend continue, then the weekend would likely end up warmer with highs in the 70s, rather than the 60s. This forecast follows closer to that trend, but acknowledges that we could end up with a boundary of airmasses within the CWA. This is one more item to monitor over the coming days.

Short Term
Seas near 5 ft should gradually drop through today, more in the 1-2 ft range by this evening. Winds are light through tonight, but will pick up from the SW on Tuesday, although should stay below SCA (Small Craft Advisory) levels.

Long Term
High pressure builds along the Eastern Seaboard this week, bringing increasing south to southwesterly flow. Areas of dense marine fog are possible by midweek. Some SCA (Small Craft Advisory) conditions are possible by Thursday with increasing southwesterly flow ahead of an approaching cold front. High pressure then builds across the waters going into the weekend.

NOAA Gray/Portland ME Office - Watches - Warnings - Advisories
ME...None. NH...None.