textproduct: Gray - Portland

WHAT HAS CHANGED

No significant changes at this time.

KEY MESSAGES

1. A widespread rainfall comes to an end this morning. A few showers possible Friday but overall amounts should be light and mainly confined to the mountains.

2. A gradual drying trend follows for Labor Day weekend, although there will be chances for scattered showers Saturday afternoon.

DISCUSSION

KEY MESSAGE 1 DESCRIPTION...

Steady rain with embedded heavier downpours and perhaps a few rumbles of thunder should taper off and come to an end this morning from west to east, with drying out starting across western zones around 12z. Breaks of sun are likely across New Hampshire during the day bringing the chance for scattered pop up showers during the afternoon hours. Overall rainfall amounts generally look to fall in the 0.5 to 1.00 in range although a few areas with more sustained downpours may receive upwards of 1.5 inches. Otherwise, low clouds and some drizzle may very well persist coastal zones much of the day, especially from Portland on north and northeast. Warmest temperatures today where breaks of sun are expected in southwestern NH. May have to lower the temperature forecast further outside of our southwestern NH zones due to cool northeast flow.

With light winds and a wet ground likely for tonight, fog is likely, with areas of it possibly being dense.

A better day is foreseen Friday after early morning stratus and fog burns off and temperatures rising well into the 70s to lower 80s. However, with continued troughing overhead, scattered showers remain possible.

KEY MESSAGE 2 DESCRIPTION...

An upper low will slowly slide southward from central Quebec through northern Maine and over to Nova Scotia Friday into Saturday. A surface low looks to stall over the Canadian Maritimes, allowing for the development of some retrograding showers Friday evening. Showers may even continue through the day on Saturday as weak instability remains and moisture continues to get advected from the northeast. A few rumbles of thunder can't be ruled out Saturday afternoon. By Sunday morning, the surface low over Nova Scotia is expected to shift to the southeast. This will allow for high pressure to move in from the northwest and a period of tranquil weather is likely Sunday through most of Monday. Persistent northwest flow will lead to cooler temperatures and dewpoints through the holiday weekend with highs mainly in the upper 60s north to the mid 70s south and some breezier winds out of the north. Unsettled weather may return towards the middle of next week.

AVIATION /00Z THURSDAY THROUGH MONDAY/

IFR and LIFR early this morning in rain and lowered ceilings. Conditions improve from west to east late morning and into the afternoon. Conditions at PWM AUG and RKD likely take until late in the day to improve. Fog then brings vsbys down on the coastal plain tonight before improving early Friday.

Friday-Friday night: Improving conditions, with MVFR still possible in brief afternoon showers. Valley fog is possible at LEB and HIE at night.

Outlook...

Saturday-Saturday night: Mainly VFR during the daytime, but brief MVFR conditions remain possible in afternoon showers. Nighttime valley fog is likely at HIE, LEB, and CON, and still possible at all other terminals.

Sunday-Monday night: Mainly VFR with valley fog possible at night.

MARINE

A warm front gradually lifts northward toward the waters today. A period of near SCA conditions will be possible today as a weak wave of low pressure passes north of the waters. However, this is only low probability at this time. A cold front then crosses the waters tonight, with improving conditions to follow.

Northerly flow brings fair conditions Friday. Marginal SCA conditions are then possible across the outer waters this weekend in northerly flow as low pressure deepens across Atlantic Canada.

GYX WATCHES/WARNINGS/ADVISORIES

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