Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 212205 AFDGYX Area Forecast Discussion National Weather Service Gray ME 605 PM EDT Wed Sep 21 2016 .SYNOPSIS... High pressure will be centered over the region tonight and move off the coast Thursday. A strong cold front will be slowly drifting south into northern areas late Thursday night and then into southern areas Friday. Scattered showers are expected along and ahead of this cold front. Dry conditions and the coolest air of the season are expected over the weekend and through much of next week as a large Canadian high pressure builds south across the area. && .NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...
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Update... Have updated the forecast based on current observations and latest set of mesoscale models. Mainly clear skies continue across the region after a day with above normal temperatures once again for mid September. Patchy fog will develop once again tonight, however expect the moisture to be less plentiful as it has over the past two nights, especially along the coast. May need to adjust mins down slightly with current dew points running in the 40s in many areas early this evening. Prev Disc... High pressure will be centered over the region tonight with generally clear skies at the onset. But, high clouds should spread over the area later tonight well out in advance of the approaching system from the Great Lakes. After midnight river valley fog once again expected to develop. Overnight lows will be generally in the 50s as per guidance.
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&& .SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/... An approaching Canadian short with help drag south bottled up cool Canadian air well to the north of the area. As this short wave approaches increasing clouds are expected and then scattered showers to develop in the mountains later in the day. Another mild day is expected with a light southwest flow in advance of the system. Thursday night the cold front gets pushed south into northern areas. More numerous showers are expected along and ahead of this front across the north and scattered showers should reach southern areas toward morning. QPF amounts should be light..generally a quarter inch or less since there will be a limited moisture source associated with the Canadian system. Expecting a rather mild night due to cloud cover and mixing ahead of the front. && .LONG TERM /FRIDAY THROUGH WEDNESDAY/... Models are in good agreement today. The cold front gradually slips southward during the Friday and Friday night. Showers will be likely in the mountains Friday morning with the threat progressing southward and diminishing a bit during the day as the front slips southward. Cool high pressure will build in behind the front for Saturday through next Tuesday. Minimum temperatures during the period will range mainly from the 30s north to near 50 along the coast. High temperatures will be mainly in the 50s north to 60s south. After Friday, the next threat of any significant precipitation appears to be late next week. && .AVIATION /22Z WEDNESDAY THROUGH MONDAY/... Short Term...VFR conditions except locally IFR/LIFR conditions between 08-12z Thu and again 08-12z Friday in river valley stratus and fog. Long Term...MVFR to IFR conditions expected Friday in status and showers gradually improving from north to south as the cold front slips southward. Except for early morning valley fog, VFR conditions are expected Saturday through Monday. && .MARINE... Short Term...Quiet on the waters with winds and seas remaining below SCA criteria through Thursday. Seas over the outer waters may approach SCA condition over the outer waters along the midcoast Thursday night. Long Term...Seas may be near SCA criteria Friday. Winds and seas expected to be below SCA criteria Saturday through mid week next week. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$

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