Marine Weather and Tide Forecast for Seabrook Beach, NH

NEAR TERM /THROUGH TONIGHT/
Satellite imagery currently shows a mostly clear sky this afternoon, with some marine stratocumulus streams protruding out to sea. Breezy winds should gradually taper through the evening, with a quiet but chilly second half of the day expected.

High pressure moves in overhead tonight. This will allow for skies to clear and winds to calm. These factors, in addition to the fresh snowfall received this morning should allow for a much colder night tonight. Lows look to be near 0F across the region, with lows possibly even in the -5F to -15F range north of the White Mountains. Wind chills could approach -20F across northern NH and northwestern Maine as well.

SHORT TERM /TUESDAY/
A mostly clear day is expected on Tuesday, though clouds will work in from the west by the end of the day. High temperatures could rebound quite a bit from the cold morning lows, with highs ranging from the lower 20s up north to lower 30s along the coast.

A weak surface low moves quickly across the area. The low looks to potentially bring more convectively-driven snowfall, as soundings show at least a transition into an environment that will likely be favorable for snow squall development. This line of snow showers could put down a quick inch across NH and western Maine, though the Midcoast region may see a little more. Lows will be chilly, but not as cold as Monday night's, with lows in the teens expected.

LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/
Overview...

Low pressure moves through New England on Wednesday. High pressure gradually builds in through the end of the week. An Arctic airmass then moves in through the weekend with building high pressure.

Details...

Low pressure occludes in the Great Lakes on Wednesday, with the warm front from this system moving into New England. At the same time, pressure falls likely occur offshore during the daytime on Wednesday as the system moves eastward. With this set up, warm air likely reaches the coastline on Wednesday, but will then struggle to move inland during the daytime.

Given the set up, forecast temperatures were lowered from what the NBM had using colder guidance from the Canadian and Euro.
With the cold airmass in place and arrival time of the precip, there is likely room to bring the freezing line closer to the coast, but we'll use this as a first step without going too far for now.

This set up brings accumulating snowfall across the interior, with advisory level snowfall possible through the mountains and foothills. A burst of snow is likely along the coast to start, but temps likely rise enough to switch to rain along the coastal plain during the daytime. Again, we'll have to monitor any trend toward a colder solution going into the event, as models routinely underestimate the stubbornness of the cold in place.
So rain may ultimately end up reserved for the immediate coastline and Southeast New Hampshire should a colder solution come to fruition.

Following this system, a seasonable day is expected for Thursday before the next cold airmass arrives. Colder air returns Thursday night, with teens and single digits expected for lows. Friday looks cold and blustery as an Arctic airmass returns on northwesterly flow. The rest of the weekend looks seasonably cold, with mountain snow showers likely through this timeframe. There is the chance for a weak clipper system to bring a more organized period of light snow over the weekend , but we'll have to wait a few days for this system to come into a closer view.

AVIATION /17Z MONDAY THROUGH FRIDAY/
Short Term...VFR expected this afternoon, continuing through the end of the day Tuesday. A brief reduction in conditions appears likely Tuesday night as snow showers move through the area. Midcoast sites like KAUG and KRKD appear to be at the greatest risk for restrictions, though they can not be ruled out elsewhere.

Long Term...IFR conditions are likely on Wednesday with interior snow and coastal rain. Conditions improve Thursday night, with VFR likely for most by Thursday. LEB and HIE stand the best chance to hold onto MVFR ceilings with an increasing upslope flow through the weekend. VFR mostly prevails, but there will be an increasing chance for some snow showers over the weekend.

MARINE
Short Term...SCA conditions this afternoon will simmer as seas fall below 5ft and northwesterly winds over the waters slacken.
Winds become light and variable overnight as high pressure moves overhead. On Tuesday, winds will shift to the southwest, strengthening through the day. They should reach SCA levels by the end of the day. Seas also ramp up Tuesday afternoon as well, with seas peaking at 4-7ft overnight Tuesday night.

Long Term...Low pressure tracks across northern New England Wednesday and Wednesday night, with marginal southerly gales possible on Wednesday. SCA conditions linger through at least Friday night, with westerly gales possible on Friday behind a cold front. High pressure gradually builds a cross the waters over the weekend.

GYX WATCHES/WARNINGS/ADVISORIES
ME...None.
NH...None.
MARINE...Small Craft Advisory until 4 PM EST this afternoon for ANZ150>154.