Penobscot Bay Marine Forecast
| Tonight...Se Winds Around 5 Kt, Increasing To 5 To 10 Kt Towards Daybreak. Seas Around 2 Ft. A Slight Chance Of Rain After Midnight. A Chance Of Rain Towards Daybreak. Patchy Fog After Midnight With Vsby 1 Nm Or Less. |
| Thu...Se Winds 10 To 15 Kt. Seas 2 To 3 Ft. Wave Detail: S 2 Ft At 3 Seconds. Patchy Fog In The Morning. Rain In The Morning, Then Showers Likely In The Afternoon. Vsby 1 Nm Or Less, Increasing To 1 To 3 Nm In The Afternoon. |
| Thu Night...N Winds 5 To 10 Kt, Becoming Nw After Midnight. Seas 2 To 3 Ft. Wave Detail: S 2 Ft At 6 Seconds. |
| Fri...Nw Winds Around 5 Kt. Seas Around 2 Ft. Wave Detail: S 2 Ft At 6 Seconds. |
| Fri Night...N Winds 5 To 10 Kt. Seas Around 2 Ft. |
| Sat...N Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas Around 2 Ft. |
| Sat Night...N Winds 10 To 15 Kt With Gusts Up To 20 Kt. Seas Around 2 Ft. |
| Sun...N Winds 10 To 15 Kt With Gusts Up To 20 Kt, Diminishing To 5 To 10 Kt In The Afternoon. Seas Around 2 Ft. |
| Sun Night...N Winds 5 To 10 Kt. Seas 1 Foot Or Less. |
| Mon...N Winds Around 5 Kt, Becoming Sw In The Afternoon. Seas 1 Foot Or Less. |
| Mon Night...W Winds 5 To 10 Kt. Seas 1 Foot Or Less. |
| Area Forecast Discussion National Weather Service Gray ME 800pm EDT Wednesday September 2 2026 .WHAT HAS CHANGED... No significant changes at this time this Wednesday evening. .KEY MESSAGES... 1. A widespread rainfall moves through tonight and Thursday. 2. A gradual drying trend follows for Friday and Labor Day weekend, although there will be chances for scattered showers Saturday afternoon. KEY MESSAGE 1 DESCRIPTION... A warm front remains stalled to our southwest, with high pressure off to the northeast of Maine. The high gradually moves off to the east tonight, while the warm front lifts north. A wave of low pressure moves along this front tonight, bringing a widespread round or rain, heavy showers, and some thunderstorms. The front edge of the showers arrives into northern New Hampshire around sunset, and then spreads south and east through the evening hours. A few thunderstorms will be possible as well through the evening across western New Hampshire. Severe storms are expected across Upstate New York today, but by the time they reach New Hampshire the convection is expected to be elevated and not pose a severe threat. The showers and storms evolve into a steady period of rain overnight with embedded heavier downpours. Rain is expected through the overnight, with the back edge moving from west to east during the morning hours on Thursday. Breaks of sun are likely across New Hampshire during the day tomorrow, bringing the chance for scattered Probability of Precipitation up showers during the afternoon hours. Overall rainfall amounts generally look to fall in the 0.75 to 1.25 in range. The warm front is expected to stall somewhere in western or central Maine. East of the front, low clouds and sprinkles remain through the afternoon hours. It won't be until an occluded front passes through tomorrow night that drier air moves back into the region. Clearing is expected behind this front Thursday night, with nighttime valley fog likely by late in the night. KEY MESSAGE 2 DESCRIPTION... An upper low will slowly dumbbell down from central Quebec through northern Maine and over to Nova Scotia Friday into Saturday. While Friday will mainly feature dry conditions, a few showers will be possible in the afternoon over and north of the mountains. A better chance for more widespread showers may evolve Saturday afternoon as a vort lobe rotates down around the upper low to our east. Model soundings suggest that there will be at least some modest instability in place so a few rumbles of thunder may be possible, especially over southern New Hampshire where instability will likely be maximized. Persistent northwest flow will lead to cooler temperatures and dewpoints through the holiday weekend with highs mainly in the mid 60s north to the mid 70s south and some breezier winds out of the north. An approaching ridge may lead to a slight warmup on Labor Day with some low precipitation chances returning to the forecast Monday night into Tuesday. Marine A warm front gradually lifts northward across the waters tonight and Thursday. A period of near SCA (Small Craft Advisory) conditions will be possible Thursday afternoon as a weak wave of low pressure passes north of the waters. A cold front then crosses the waters Thursday night, with improving conditions to follow. Northerly flow brings fair conditions Friday. Marginal SCA (Small Craft Advisory) conditions are then possible across the outer waters this weekend in northerly flow as low pressure deepens across Atlantic Canada. NOAA Gray/Portland ME Office - Watches - Warnings - Advisories ME...None. NH...None. Marine None. |
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