Marine Weather and Tide Forecast for Belfast, ME

NEAR TERM /TONIGHT/
635 PM Update...Just minor changes to temperature and sky cover with this update to keep things in line with the latest observations. Forecast remains in good shape with most of the area now under clearing skies. A stubborn deck of clouds remains over southern New Hampshire, but this is slowly sinking south along with the frontal boundary.

Previous Discussion...
A slow moving front continues to sag southward through the evening, with clearing skies pressing southward as well. The front stalls, and some low level moisture begins to increase on a light east flow. Some fog can't be ruled out along parts of the MidCoast tonight, but overall it doesn't look like the airmass moistens up quite enough to bring more widespread coverage tonight.

Across most of the interior, and especially the north, clearer skies allow for more radiational cooling overnight. Through the northern valleys, some patchy valley fog is likely by morning as lows cool into the mid 40s, with some low 40s likely in more sheltered spots. Further south into southern New Hampshire, enough cloud cover likely remains to keeps temp into the low 50s through the night.

SHORT TERM /SUNDAY THROUGH SUNDAY NIGHT/
Temperatures start to rebound tomorrow as high pressure builds in from the east. This makes for sunnier conditions, and also a light but steady onshore flow. Highs likely warm into the low 70s across much of the interior, with some mid 70s likely through the Connecticut River Valley. The onshore flow keeps the coast into the 60s for highs, with the immediate shoreline likely confined to the low 60s. Most water bodies have warmed into the 60s by now, but some northern water bodies and rivers are likely still in the upper 50s.

Mostly sunny skies are expected along the coast, with gradually increasing pop up cloud cover further inland. Isolated showers and possibly a stray thunderstorm likely form by the afternoon hours across the higher terrain, but remain limited in coverage and brief.

Tomorrow night looks pretty quiet as high pressure persists across New England. Mostly clear skies allow for another night of radiational cool across the north with lows dipping into the 40s, and generally into the low 50s across the south.

LONG TERM /MONDAY THROUGH FRIDAY/
No big changes to the going forecast as the 12z deterministic and ensemble suite are in reasonable agreement and showing decent run to run continuity. The main theme will be high pressure hanging out just offshore early next week which will mean southeasterly winds over the land with the potential for a good amount of clouds. The onshore flow will keep temperatures somewhat down as well. The high is modeled to move farther out to sea mid week, allowing for more of a southwesterly flow regime to take shape. This should allow for more summery weather with temperatures well into the 80s by Thurs along with increasing chances of afternoon thunderstorms.

AVIATION /00Z SUNDAY THROUGH THURSDAY/
Short Term... Mainly VFR prevails, but some MVFR to near MVFR ceilings linger across southern terminals into the evening.
Another period of MVFR ceilings is possible with a marine stratus deck late tonight. A period of valley fog is likely LEB and HIE late tonight. VFR then prevails on Sunday and Sunday night.

Long Term...VFR likely prevails through midweek next week, with nighttime valley fog possible each night. Marine fog is possible at RKD by midweek as the airmass moistens. Chances for scattered afternoon showers and storms increase across interior terminals starting Wednesday and continue through late week.
More widespread showers and storms are possible late Thursday or Friday.

MARINE
Short Term...Fair conditions persist through Sunday night as a front stalls across the waters. High pressure gradually builds across the waters through Sunday night.

Long Term...High pressure gradually moves eastward across the North Atlantic through midweek next week with generally fair conditions. However, fog will be possible. A cold front approaches late in the week, with SCA conditions possible in southwesterly flow ahead of the front by late Wednesday.

GYX WATCHES/WARNINGS/ADVISORIES
ME...None.
NH...None.
MARINE...None.