textproduct: Gray - Portland

WHAT HAS CHANGED

Issued a Special Weather Statement through 13Z to highlight areas of fog that have developed with visibility locally down to 1/4 mile. Otherwise, just tweaked the aviation section for the 12Z TAFs.

KEY MESSAGES

1. Sunnier weather today after areas of potentially dense fog early this morning, but scattered showers remain possible, mainly this afternoon. Warmer.

2. A backdoor cold front will allow for a few showers Saturday into Saturday night, potentially continuing into Sunday morning. Otherwise, dry weather on Monday could be followed by more unsettled weather later on next week.

DISCUSSION

KEY MESSAGE 1 DESCRIPTION...

Areas of dense fog are possible early this morning, affecting the morning commute. The fog should thin out by 9 am most areas except perhaps the immediate coast and deeper valleys.

Scattered showers are then possible this afternoon as cool cyclonic flow aloft persists along with weak SFC troffing. Highs should be warmer today with lesser clouds, especially in the morning.

KEY MESSAGE 2 DESCRIPTION...

A mid-level trough deepens over the Canadian Maritimes on Saturday. A surface low looks to stall over Nova Scotia, allowing for the development of some retrograding showers along a backdoor cold front Saturday. A few rumbles of thunder can't be ruled out Saturday night. Temperatures Saturday may trend downward on the coastal plain during the afternoon. By Sunday evening, the aforementioned surface low over Nova Scotia is expected to shift to the southeast with high pressure moving in. High pressure will allow for tranquil weather for most of Monday/Labor Day. Persistent northerly flow over the weekend will lead to cooler temperatures and dewpoints through the holiday weekend with highs mainly in the lower 70s and some breezier winds out of the north. Unsettled and warmer weather may return towards the middle of next week.

AVIATION /10Z FRIDAY THROUGH TUESDAY/

Through 12Z Saturday: Areas of fog and low ceilings will continue to bring IFR-LIFR restrictions through around 13Z to most TAF sites before improving to VFR later today. The possible exception will be within any scattered SHRA this afternoon, which may bring TEMPO restrictions. Light and variable flow this morning will increase out of the NW later today with gusts up to 20 kts. Mainly VFR conditions are expected tonight, although some valley FG cannot be ruled out at LEB and HIE. LLWS is not anticipated through the period.

Outlook...

Saturday: MVFR cigs could linger from LEB to HIE along the US/CAN border. SHRA develop across much of the interior, continuing into the evening.

Saturday night: SHRA decrease, but there is a chance MVFR cigs remain over a portion of the area.

Sunday: VFR, isolated showers possible with breezy NW winds. No sig wx.

Sunday night: VFR with decreasing clouds, overnight valley fog possible.

Monday and Monday Night: VFR, not as breezy. No sig wx.

Tuesday: VFR, no sig wx.

MARINE

Areas of fog will be possible over the waters this morning, possibly lingering into the afternoon hours. Northerly flow brings fair conditions through the rest of the day with SCA conditions not expected.

Low pressure will be near Nova Scotia come Saturday, with breezy NNW winds becoming northeast during the afternoon. Some gusts near 25 kts possible on the outer waters, continuing overnight. Winds slacken Sunday into early next week as areas of high pressure near New England and the Northeast.

GYX WATCHES/WARNINGS/ADVISORIES

ME...None. NH...None. MARINE...None.