textproduct: Gray - Portland

WHAT HAS CHANGED

No major changes for this forecast package.

KEY MESSAGES

1. A weak front continues to bring in drier air through Monday, while another front brings the chance for showers and storms late Monday and Monday night.

2. Cooler weather and relatively low dew points are expected from Tuesday through the end of the the week. The best chance of showers and thunderstorms will be late Wednesday into Thursday.

DISCUSSION

KEY MESSAGE 1 DESCRIPTION...

Drier air continues to work its way in overnight tonight. This brings dew points down into the 50s and low 60s, allowing temps to follow and bring a much cooler night than the last several. Lows bottom out in the upper 50s to near 60 for most interior location, while the coast holds onto some low to mid 60s.

A seasonably warm day is expected tomorrow with widespread highs in the mid 80s. A sea breeze does knock temps back along the coast by the afternoon hours. Dew points will mainly be in the low 60s tomorrow, keeping heat indices in step with the actual air temps.

A cold front approaches during the day tomorrow. A weak low develops along this front and moves through southern Quebec late tomorrow and tomorrow night. This likely brings a round of showers and storms in from the west by late tomorrow, and moreso tomorrow evening. The most widespread activity for these will be across the north and near the Canadian border, with chances dropping off toward the coast. A strong storm can't be ruled out early in the evening, but otherwise the main focus would be for heavy rainfall on any spots that see a couple storms move over the same areas. This front then moves offshore by late in the night, with clearing skies following by daybreak Tuesday.

KEY MESSAGE 2 DESCRIPTION...

The weather looks relatively benign Tuesday into next weekend with cooler and drier airmasses moving in from time to time. The best chance of showers and thunderstorms looks to be late Wednesday into Thursday based on a multi-model consensus. Otherwise mainly dry weather is expected with highs generally in the 70s in the mountains to lower 80s to mid 80s at lower elevations Tuesday and Wednesday with a cooler temperatures thereafter.

AVIATION /18Z SUNDAY THROUGH FRIDAY/

Through 12z Tuesday...VFR prevails at most terminals through Monday afternoon, except HIE and LEB that likely see valley fog develop after midnight tonight and again Monday night, and then clear by mid morning. Showers and storms likely bring brief restrictions late tomorrow afternoon and evening, with the best chance for these at LEB, HIE, and AUG. VFR then returns by late tomorrow night outside of any valley fog.

Outlook:

Tuesday-Tuesday night: VFR conditions with some late night valley fog possible.

Wednesday-Thursday: Cigs and vsbys VFR Wednesday possibly lowering to MVFR in showers and thunderstorms Wednesday night into Thursday.

Friday: VFR expected.

MARINE

A weak front continues to pass through the waters today, and then another front brings a chance for storms Monday evening and into the overnight hours. Fair winds and seas continue outside of any storms through tomorrow night. Winds and seas will largely remain below SCA criteria through the week as a series of generally weak cold fronts cross the waters.

GYX WATCHES/WARNINGS/ADVISORIES

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