Area Forecast Discussion
Issued by NWS Portland, ME

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463 FXUS61 KGYX 232337 AFDGYX Area Forecast Discussion National Weather Service Gray ME 737 PM EDT TUE AUG 23 2016 .SYNOPSIS... Cool high pressure will build over the area tonight and will move offshore into the Atlantic Wednesday, with warmer temperatures arriving on southwesterly winds. The warm weather will continue Thursday into Friday when a cold front moves through. There will be a chance of showers and possible thunderstorms as the front moves through, otherwise, expect drier and slightly cooler conditions are expected for the weekend. && 23Z UPDATE... Quick update to tweak temps/tds based on current obs. Aside from a few scattered clouds in northern zones...still looking for clear skies and light winds overnight. Should be slightly warmer than last night with lows generally in the lower to mid 50s. No other changes planned attm. Previous discussion... .NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/... High pressure will be firmly in control tonight...with the surface ridge axis more or less over the top of the forecast area. This will allow temps to quickly drop off after dark. Given the recent rnfl...valley fog should develop is most of the favored locations tonight. Will have to watch for some patchy dense fog is the larger valleys...especially the CT River. Temps will be comfortable...but not as cool as last night. && .SHORT TERM /6 AM WEDNESDAY MORNING THROUGH WEDNESDAY NIGHT/... Surface ridge axis will be E of the forecast area Wed...allowing return flow to set up. Temps will be warmer...with readings approaching 90 across Srn NH. Increasing high clouds and rising temps Wed night should prevent widespread valley fog from developing. && .LONG TERM /THURSDAY THROUGH TUESDAY/... A warm front will push northeast during the day Thursday with the greatest threat of precipitation across the mountains. A cold front will approach the region Thursday night and cross the region Friday. Again, the greatest threat of significant showers and possible thunderstorms will be in the mountains. Timing of front may be critical to any thunderstorm development. Temps Thursday and Friday will reach the upper 80s across southern NH and sw Maine. High pressure will build into the area behind the front for Saturday into Sunday with cooler temperatures. Another warm front will push back through the region Sunday night and Monday bringing the threat of showers. Fair and mild weather is expected behind the front early next week. && .AVIATION /00Z WEDNESDAY THROUGH SUNDAY/... Short Term...VFR conditions will prevail thru Wed night. High pressure in control tonight will promote patchy fog in typical locations. Expect LEB and HIE to see LIFR conditions again tonight...and I followed persistence timing at those terminals. Otherwise I do not anticipate any widespread issues with fog at the Srn NH and coastal Wrn ME terminals. Long Term...Mainly vfr conditions expected with scattered mvfr to ifr conditions possible in showers and possible thunderstorms Thursday into Friday. && .MARINE... Short Term...Winds and seas will remain below SCA thresholds. Long Term...SCA conditions for seas possible Thursday night into Friday night...otherwise winds and seas expected to be below SCA criteria. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$

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