Marine Weather Net

Cape Elizabeth ME to Merrimack River MA Marine Forecast


5 - 10




5 - 10


5 - 10

The Marine Weather Forecast In Detail:
ANZ154 Forecast Issued: 941 PM EDT Tue Jul 27 2021

Overnight...Ne Winds 5 To 10 Kt. Seas 2 To 3 Ft. Showers Likely Late This Evening, Then A Chance Of Showers. Vsby Variable To Less Than One Quarter Nm.
Wed...N Winds Around 10 Kt, Becoming E In The Afternoon. Seas Around 2 Ft. A Chance Of Showers In The Morning.
Wed Night...Sw Winds 5 To 10 Kt. Seas Around 2 Ft.
Thu...Sw Winds 5 To 10 Kt, Becoming S 5 To 15 Kt With Gusts Up To 20 Kt In The Afternoon. Seas 2 To 3 Ft.
Thu Night...S Winds 10 To 15 Kt With Gusts Up To 25 Kt. Seas 2 To 4 Ft. Showers Likely In The Evening, Then Showers Likely With A Chance Of Tstms After Midnight. Vsby 1 To 3 Nm.
Fri...Sw Winds 5 To 10 Kt. Seas 2 To 3 Ft. Showers Likely, Mainly In The Morning With Vsby 1 To 3 Nm.
Fri Night...W Winds 10 To 15 Kt With Gusts Up To 25 Kt. Seas 2 To 3 Ft. A Chance Of Showers In The Evening.
Sat...W Winds 10 To 15 Kt. Seas 2 To 3 Ft.
Sat Night...W Winds Around 10 Kt. Seas Around 2 Ft.
Sun...W Winds Around 10 Kt, Becoming S In The Afternoon. Seas 2 To 4 Ft. A Chance Of Showers In The Afternoon.
Sun Night...S Winds 10 To 15 Kt. Seas 2 To 4 Ft. A Chance Of Showers. Winds And Seas Higher In And Near Tstms.
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Area Forecast Discussion
National Weather Service Gray ME
954pm EDT Tuesday July 27 2021

Low pressure in the gulf of Maine will move northeastward and into the Maritimes tonight Wednesday. Weak high pressure will then build overhead through early Thursday. A cold front moves toward the region Thursday night and Friday with increasing chances of showers.

Near Term - Until 6am Wednesday Morning
950 PMHave updated the forecast mainly for minor adjustments to Probability of Precipitation and temperatures. The rain and thunder from earlier this evening has moved offshore. However, there will continue to be some lingering showers and upper trough deepens overhead. However, drier air will work in from the north and pretty much cut off the shower chances after 06z or 07z. Patchy fog is also likely in spots.

610 PMThunderstorms currently ongoing across southern NH at this time will move offshore by 00z. Will likely be able to cancel the severe thunderstorm watch early. Otherwise, across the rest of the region, expect a region of mainly light rain with a possible rumble to move west to east this evening. Amounts with this activity should be fairly light.

Previously... A cold front is located in NY state and will move eastwards crossing our area this evening. Ahead of the front temperatures in the low 80s with dewpoints in the mid 60s have brought SB CAPE to around 2000 J/kg ahead of the line. Bulk shear of 45kts is sufficient to support severe storms, and the strongest portion of the developing line will pass through southern New Hampshire this evening. Storm Prediction Center has upgraded southern NH to slight risk for severe weather, which seems appropriate. Most of the forcing is with the stronger southern end of the front although a few isolated cells further north are not completely out of the question. Overall the highest threat is across Cheshire and Hillsborough county NH where a Severe thunderstorm watch has been issued.

.SHORT TERM /6am WEDNESDAY MORNING THROUGH THURSDAY/... Overnight behind the front, will see dewpoints drop, and don't expect widespread fog as a result of this drying. Some valley fog is possible in the CT river valley where the moisture can linger longer and will hold onto it through this region.

Wednesday high pressure builds into the region. Temperatures will be cooler than the past few days, with highs in the mid 70s, along with dewpoints in the mid 50s which combined with sunny skies will make for a pleasant day for outdoor activity.

Long Term - Thursday Night Through Tuesday
Overall pattern favors below cooler conditions across the region over the weekend and into next week as the area remains under the influence of an upper level trough. Surface high pressure slides offshore on Thursday allowing a brief period of return flow out of the SW. Expect upstream convection ahead of an approaching cold front to move into NH during the day and expand in coverage overnight as a low pressure system moves along the boundary. Can't rule out thunderstorm development, but advancing cloud cover could reduce instabilities. Showers will continue into Friday as the system pushes east, with cooler air filling in behind the front. Saturday will be cool with temperatures struggling to reach the 70s for much of the area along with a NW breeze and low humidities. Despite a drier airmass and weak surface high pressure trying to build in Saturday into Sunday, can't rule out some isol/scattered showers thanks to the cold pool(a region of relatively cold air) aloft and steepening lapse rates. These will mainly be diurnally driven and coverage and amounts look limited unless some shortwave energy supports some expansion. By Monday, the ECMWF (European Centre for Medium-Range Weather Forecasts) couples the two upper jets over New England with the potential for a weak surface low offshore, bringing some higher rain chances.

Short Term
NWly flow will move in tonight with drier conditions.

Long Term...A cold front will push offshore on Friday night with NW flow. Breeze conditions will develop on Saturday due to mixing, but winds should remain 15kt or less on the water due to cold and more stable conditions. By Sunday night a weak low pressure system should skirt along the coast with increasing southerly flow 15-20kt possible and waves building to 4 ft.

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