textproduct: Gray - Portland

SYNOPSIS

High pressure remains in place across New England through Thursday. Temperatures moderate through the week and with continued dry weather, drought conditions will deepen. A cold front moves through Thursday night. High pressure follows for the weekend, bringing a fresh cold and dry airmass to New England.

NEAR TERM /THROUGH TONIGHT/

Surface high pressure will remain centered over New England tonight. Hi res guidances suggest that in addition to fog in the valleys some patchy fog will be possible along the coastal plain. Lows tonight will generally be in the 40s tonight.

SHORT TERM /TUESDAY THROUGH TUESDAY NIGHT/

High pressure remains in control Tuesday into Tuesday night as a cut off low over the Mid Atlantic makes little progress northward. Skies will be mostly sunny with light onshore winds during the afternoon. Highs will generally be in the 70s with some interior locations making a run into the low 80s.

Some moisture associated with the cut off low south of New England will spill into the area Tuesday night. This willy result increasing clouds across the south the second half of the night. There likely will be enough radiational cooling before the arrival of high clouds for valley fog again and possibly some marine fog pushing into Mid Coast. Lows will again mainly be in the 40s.

LONG TERM /WEDNESDAY THROUGH MONDAY/

Overview...

High pressure remains in control across New England through Thursday, while low pressure remains stalled along the Mid Atlantic coast. A cold front crosses through Thursday night. High pressure brings a cool airmass behind the front for the weekend.

Details...

High pressure extends westward across New England on Wednesday. Low pressure stalled across the Mid Atlantic brings some more cloud cover on Wednesday, especially across southern areas. A stray sprinkle can't be ruled out along the coastline, but offers no relief to the drought conditions.

The low weakens by Thursday, bringing more sunshine and warmer temperatures to northern New England. Thursday looks to be the warmest day of the week, with highs pushing into the upper 70s to low 80s across the area. A cold front approaches during the daytime, and then crosses through New England Thursday night. The front will be mostly dry, offering little more that a few showers across the higher terrain.

High pressure builds in during the daytime on Friday behind the front. Friday offers one more seasonably warm day along the coast as a northwesterly breeze allows temps to warm into the upper 70s again. Further north, CAA will be underway through the day, keeping highs confined to the low to mid 60s.

The air mass associated with the high pressure center has origins in the Arctic. This brings a much cooler and dry airmass the New England for the weekend. Highs remain in the 60s on Saturday, with Saturday night likely to be the coolest night of the stretch. A widespread frost or freeze remains possible across much of the interior Saturday night, but is still dependent on the high pressure center crossing during the overnight time frame, which is still somewhat uncertain. Widespread low to mid 30s look likely across much of the interior. Should the passing high center line up for Saturday night, upper 20s to low 30s would be expected across the interior. We'll continue to monitor this potential over the next few days.

AVIATION /17Z MONDAY THROUGH FRIDAY/

Short Term...Valley fog will bring IFR to LIFR conditions tonight at KLEB and KHIE and likely to KCON. Patchy fog will also be possible at remaining TAF sites while confidence is lower. VFR prevails Tuesday with another round of valley fog likely Tuesday night. Some marine fog/low stratus may impact KAUG and KRKD Tuesday night.

Long Term...VFR prevails during the daytime each day through the weekend. Nighttime valley fog is likely and LEB and HIE each night, and possible elsewhere. Marine/radiation fog will also be possible each night along coastal terminals Wednesday night and again Thursday night.

MARINE

Short Term...Winds and seas will remain below SCA thresholds with high pressure over the waters. Light winds will turn onshore Tuesday afternoon. Some increase in moisture may allow for some marine fog to develop Tuesday night.

Long Term...High pressure prevails across the waters through Thursday, with conditions remaining below SCA levels. A cold front crosses the waters late Thursday night and early Friday, with high pressure building in behind the front for the weekend. A period of marginal SCA conditions are possible in northwesterly flow Friday night.

GYX WATCHES/WARNINGS/ADVISORIES

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