Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 140141 AFDGYX Area Forecast Discussion National Weather Service Gray ME 941 PM EDT Sun Aug 13 2017 .SYNOPSIS... High pressure moves in this evening. Quiet and mild weather is expected Monday with a cold front expected to approach Tuesday with showers and thunderstorms possible during the afternoon. High pressure builds in Wednesday before another low pressure system possibly affects the region Thursday into Friday. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/... 940 pm Update: Input all mesonet data on this very quiet night. Temps falling as forecast under clear skies and dimnishing winds. No changes needed. 645 pm Update: Very quiet conditions under high pressure with clear skies and winds diminishing. Previous forecast on track with no changes needed. Previous Discussion: A short wave and attendant surface cold front continue to pull away this afternoon to the northeast. Tranquil weather will be in control for the next 24-30 hrs before another cold front moves south out of Quebec. High pressure...calm winds...and clear skies will support good radiational cooling conditions tonight allowing temperatures to drop into the upper 40s in mountain valleys to mid to upper 50s elsewhere. Fog will develop across much of the interior valleys and favored spots including the CT and Kennebec River valleys. && .SHORT TERM /6 AM MONDAY MORNING THROUGH MONDAY NIGHT/... Monday will be mostly sunny and warm with temperatures in the upper 70s for the mountains to the lower to mid 80s for interior and coastal regions. Clouds begin to creep in Monday night into Tuesday morning ahead of the cold front dropping out of southern Canada. Overnight lows will be a few degrees warmer Monday night/Tuesday morning than the previous night. Any precipitation should hold off until after daybreak. && .LONG TERM /TUESDAY THROUGH SUNDAY/... The models remain in decent agreement on the long wave pattern through late next week. An omega block will be centered across the Canadian Prairies with the eastern anchor trough found across eastern Canada and New England. As we head through the extended period...the numericals begin to break the block down with timing and strength differences adding increased uncertainty to sensible weather details after the mid week period. In the dailies...a cold front will drop south across the area late Tuesday and Tuesday night and provide a focus for strong convection across the area. A ridge of high pressure follows this front for Wednesday into Thursday. Low pressure approaches from the Great Lakes late Thursday into Friday. && .AVIATION /02Z MONDAY THROUGH FRIDAY/... Short Term...Widespread valley fog tonight, HIE and LEB for sure. SSE to S winds under 10 kts expected Monday. Long Term... Tue PM - Wed AM...areas of MVFR in shra/tsra. Thu night - Fri...Areas of MVFR in shra/tsra. && .MARINE... Short Term...Calm winds and seas expected over the next 24-30 hours. Long Term... Winds and seas are expected to remain below small craft threshold through Friday. && .EQUIPMENT... The weather radar at Gray (GYX) will be down for maintenance for approximately two to three days, beginning today, Aug 13th. During that time technicians will be installing important upgrades. This work has been scheduled to minimize any potential impacts to office operations. During the outage, radar coverage is available from adjacent radar sites including Burlington-Vermont (KCXX), Taunton- Massachusetts (KBOX), and Hodgdon-Maine (KCBW). Also, the radar at Albany (KENX) suffered a failure that has been attributed to azimuthal motor/gear issues. It is expected to be down for several days. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ is the U.S. government's official web portal to all federal, state and local government web resources and services.