Area Forecast Discussion
Issued by NWS Portland, ME

Current Version | Previous Version | Text Only | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
000 FXUS61 KGYX 180132 AFDGYX Area Forecast Discussion National Weather Service Gray ME 932 PM EDT Thu Aug 17 2017 .SYNOPSIS... A warm front will approach from the southwest tonight and Friday and will gradually push east of the region Friday night. A slow moving cold front will cross the region Saturday through Saturday night. High pressure will build in from the west Sunday through Monday and will slide offshore on Tuesday. A cold front will move in from the west Tuesday night and will cross the region on Wednesday. High pressure will build in behind the front Wednesday night through Thursday. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...
-- Changed Discussion --
Update... Have updated the grids to account for current conditions. High cloudiness will continue to stream eastward ahead of the next approaching system. Have adjusted dew point and temperatures with winds becoming light over the next couple hours. Temperatures are already approaching their forecast lows over northern areas. Have lowered overnight min temperature forecast in most areas by a few degrees. High surf advisories have been canceled as nearshore waves remain at or below four feet. Precipitation over western New York State will continue to gradually move east overnight. Mesoscale models suggest this light rain shower activity will reach western portions of our forecast area around midnight tonight. Prev Disc... Clouds will be on the increase overnight as a warm front approaches from the southwest. Clouds will lower and thicken after midnight and showers will push into New Hampshire toward daybreak. Low temperatures will range through the 50s across most of the forecast area.
-- End Changed Discussion --
&& .SHORT TERM /6 AM FRIDAY MORNING THROUGH FRIDAY NIGHT/... Rain will overspread the forecast area from west to east Friday morning. Increasing onshore flow ahead of the warm front will bring ocean stratus into a good portion of the forecast area in the afternoon. Although instability will be on the increase to the west of the forecast area during the afternoon...extensive marine layer will inhibit any convection across the region with the possible exception of extreme southwest New Hampshire where a few cells may hold together long enough to produce a few rumbles. Highs Friday will range from the mid 60s to mid 70s. Warm front will gradually push east through the region Friday night. Expect steadier rain to gradually taper to showers from west to east overnight. Rainfall amounts will generally add up to a half to three quarters of an inch across the region. Lows will range from the mid 50s north to the mid 60s south. && .LONG TERM /SATURDAY THROUGH THURSDAY/... Precipitation associated with the warm front will be mainly east of the region by Saturday morning...however humid air will remain across the region during the day Saturday as a cold front approaches from the west. Temperatures Saturday will warm from the mid 70s in the mountains to the mid 80s across southern areas under partly cloudy skies. This will allow scattered showers and thunderstorms to develop Saturday afternoon with the greatest threat over western Maine...with somewhat of a lesser threat across New Hampshire. The front will cross the region Saturday night with less humid air expected during the day Sunday. High temps Sunday will again range from the mid 70s to mid 80s. Temperatures will gradually become warmer Monday and Tuesday as a ridge of high pressure approaches the area and then moves offshore. By Tuesday...high temps will be mainly in the 80s across the region with southern New Hampshire and extreme southwestern Maine approaching 90. A cold front will cross the region Wednesday or Wednesday night bringing a threat of showers and thunderstorms. Fair weather with cooler temperatures will follow the front for Thursday. && .AVIATION /02Z FRIDAY THROUGH TUESDAY/... Short Term...VFR tonight. IFR/LIFR ceilings develop on Friday and will persist through Friday night. Long Term...Some improvement expected Saturday morning with mvfr to ifr conditions developing. However...IFR conditions are possible in afternoon thunderstorms. VFR conditions expected Sunday through Tuesday with fog possible in the favored valleys. && .MARINE... Short Term...Have lowered SCAs for the coastal waters. Seas now remaining at or below four feet in all areas. Long Term...SCA`s may be needed on the outer waters Saturday into Sunday...otherwise winds and seas expected to be below SCA criteria. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ JC is the U.S. government's official web portal to all federal, state and local government web resources and services.