Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 230644 AFDGYX Area Forecast Discussion National Weather Service Gray ME 244 AM EDT TUE AUG 23 2016 .SYNOPSIS... Cool high pressure will build into the area from the west through today. It will move off into the Atlantic on Wednesday, with warmer temperatures arriving on southwesterly winds. The warm weather continues Thursday into Friday when a cold front moves through. There will be a chance of showers and thunderstorms as the front moves through, but otherwise expect drier and slightly cooler conditions this weekend. && .NEAR TERM /THROUGH TODAY/... At 06z...a sprawling 1026 millibar high was centered over West virginia. GOES infrared imagery showed clear skies across the forecast area. The light winds, clear skies, and dry airmass in place were allowing temperatures to tumble in the predawn hours with readings ranging from the 40s in the normally colder valleys to the 50s elsewhere. For today...the center of the surface high continues to build to our south with westerly flow ushering slightly warm air back into the area. Some warm air advection clouds may brush our northern Maine zones later today. Otherwise...a sunny day with highs ranging from the upper 70s to the lower 80s...with some lower 70s over our northern Maine mountain zones. && .SHORT TERM /TONIGHT THROUGH 6 PM WEDNESDAY/... A few warm air advection clouds across northern areas tonight...otherwise mostly clear with the surface high center situated off the mid Atlantic coast. The light winds and mainly clear skies should lead to some patchy valley stratus and fog development in the predawn hours. Lows tonight should be mainly in the 50s. On Wednesday...850 millibar temperatures continue to warm in westerly flow as the surface high center is situated southeast of New England. The sunshine coupled with 850 millibar temperatures near plus 16c should result in widespread 80s with a few 90 degree readings possible over the southern third of New Hampshire into adjacent southwest Maine. && .LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/... A weak short wave trough will move from near the Quebec/Ontario border Wednesday night and across northern Maine Thursday. This may allow for a few showers or maybe even a thunderstorm in the mountains during this time. Otherwise, we expect fairly typical summer weather with increasing humidity. Another short wave trough approaches Thu night and Friday and could potentially bring a round of showers and thunderstorms Thu night and Fri, especially across the north. High pressure then builds in for Saturday and much of Sunday. A warm front may approach Sunday night and Monday bringing a renewed chance of showers and thunderstorms. && .AVIATION /06Z TUESDAY THROUGH SATURDAY/... Short Term /through Wednesday/...local IFR psb in valley stratus and fog btw 09z and 12z today and again Wednesday morning. Otw VFR conditions are expected as surface high center builds by to our south. Long Term...Generally VFR Wednesday through Thursday. Areas of MVFR conditions possible in Showers and thunderstorms Thursday night and Fri. VFR Friday night and Saturday. && .MARINE... Short Term /through Wednesday/...quiet on the waters through tonight. On Wednesday...southwest flow will increase by afternoon but both winds and seas should remain below small craft threshold through the day on Wednesday. Long Term...Small craft conditions possible Thu and Thu night in advance of a cold front as SW flow increases, especially on the ocean waters. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...None. NH...None. MARINE...None. && $$ Schwibs/ME is the U.S. government's official web portal to all federal, state and local government web resources and services.