Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 262100 AFDGYX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAY ME 500 PM EDT FRI SEP 26 2014 .SYNOPSIS... HIGH PRESSURE WILL BUILD IN FROM THE WEST TONIGHT THROUGH SATURDAY AND WILL HOLD OVER THE REGION ON SUNDAY. A COLD FRONT WILL APPROACH FROM THE NORTH SUNDAY NIGHT AND WILL SAG SOUTH INTO THE REGION ON MONDAY. THE FRONT WILL GRADUALLY PUSH SOUTH OF THE REGION ON TUESDAY. HIGH PRESSURE WILL BUILD IN FROM THE NORTHWEST TUESDAY NIGHT THROUGH THURSDAY. && .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
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5 PM...JUST A QUICK UPDATE TO T/TD...MAINLY TO COVER THE EVENING HOURS AS INLAND TEMPS STAY ON THE WARMER SIDE THROUGH THE DAYLIGHT HOURS AND COASTAL ZONES DROP DUE TO ONSHORE FLOW. PREVIOUSLY...HIGH PRESSURE OVER THE AREA WILL PRODUCE CLEAR SKIES TONIGHT WITH LIGHT WINDS...SETTING UP PERFECT RADIATIONAL COOLING CONDITIONS. WITH DEW POINTS IN THE UPPER 40S TO LOW 50S I`M NOT EXPECTING IT TO GET NEARLY AS COLD TONIGHT...BUT FOG WILL SET IN RIGHT AROUND MIDNIGHT IN THE VALLEYS AND BECOME QUITE DENSE IN SOME LOCATIONS WITH A STRONG 6C-9C INVERSION SETTING UP.
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&& .SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/... SATURDAY IS LOOKING LIKE A VERY WARM DAY AS THE UPPER RIDGE MAKES ITS PRESENCE FELT. EXPECT UPPER 70S TO LOW 80S DEGREE READINGS POSSIBLE. WILL LIKELY SEE A SEABREEZE AT THE COAST AGAIN KEEPING HIGHS A FEW DEGREES COOLER THERE. MODEL GUIDANCE IS POINTING AT T850 BETWEEN 15C-18C...SO YES IT DOES APPEAR THAT SUMMER HAS RETURNED. REALLY THE ONLY CHALLENGE IN THE FORECAST IS WHEN FOG WILL DEVELOP DURING THE OVERNIGHT HOURS WITH A STRONG INVERSION AT ALL LOCATIONS SETTING UP. BUFKIT SOUNDINGS WERE SHOWING INVERSIONS AS HIGH AS 10C...SO DEFINITELY SOME DENSE FOG IS LIKELY IN THE VALLEYS AGAIN WITH PATCHY FOG ELSEWHERE. PERSISTENCE IS THE FORECAST OF CHOICE IN THIS CASE. && .LONG TERM /SUNDAY THROUGH FRIDAY/... HIGH PRESSURE WILL PROVIDE ONE MORE INDIAN SUMMER DAY ON SUNDAY WITH PLENTY OF SUN AND TEMPS WELL ABOVE NORMAL. HIGHS IN THE NORTH WILL BE IN THE MID 70S TO LOWER 80S AND UPPER 70S TO MID 80S ELSEWHERE. COLD FRONT APPROACHES FROM THE NORTH SUNDAY NIGHT AND WILL GRADUALLY SAG SOUTH INTO THE REGION ON MONDAY. NEW MODEL RUNS TRENDING SLOWER IN BRINGING THIS BOUNDARY SOUTH SO MAY SALVAGE ONE MORE NICE DAY IN SOUTHERN ZONES ON MONDAY. FARTHER NORTH CLOUDS WILL BE ON THE INCREASE BUT APPEARS ANY SHOWER ACTIVITY WILL REMAIN NORTH OF THE BORDER. WILL SEE TEMPS GETTING BACK TOWARD NORMAL WITH HIGHS FROM THE 60S NORTH TO THE UPPER 60S TO LOWER 70S SOUTH. COLD FRONT WILL PUSH SOUTH OF THE REGION MONDAY EVENING AND ONSHORE FLOW WILL BRING OCEAN STRATUS INTO MUCH OF THE REGION OVERNIGHT. MUCH COOLER DAY ON TAP FOR TUESDAY AS LOW CLOUDS HANG ON FOR MUCH OF THE DAY. MAY POKE SOME HOLES IN THE OVERCAST IN INLAND LOCATIONS BUT A MAJORITY OF THE FORECAST AREA WILL SEE A MOSTLY CLOUDY DAY WITH HIGHS ONLY IN THE MID 50S TO LOWER 60S. HIGH PRESSURE BUILDING IN FROM THE NORTHWEST WILL FINALLY SUPPRESS OCEAN STRATUS TO THE SOUTH OF THE REGION BY WEDNESDAY MORNING. EXPECT TEMPS TO REBOUND TO NEAR NORMAL UNDER MOSTLY SUNNY SKIES. HIGH TEMPS WILL RANGE THROUGH THE 60S ACROSS THE REGION. FAIR WEATHER WILL CONTINUE THURSDAY AND FRIDAY AS HIGH PRESSURE BUILDS SOUTHEAST INTO THE MARITIMES. WILL LIKELY SEE A RETURN TO OCEAN STRATUS LATE IN THE DAY ON FRIDAY AS ONSHORE FLOW INCREASES AND A FRONT APPROACHES FROM THE WEST. && .AVIATION /21Z FRIDAY THROUGH WEDNESDAY/... SHORT TERM...VFR EXPECTED EXCEPT FOR VALLEY FOG AT NIGHT TONIGHT AND TOMORROW NIGHT. FOG IS HIGHLY LIKELY AT LEBANON AND WHITEFIELD AND CONCORD. COULD ALSO SEE PATCHY FOG AT AUGUSTA. CANNOT RULE IT OUT AT THE OTHER LOCATIONS EITHER BUT CONFIDENCE IS NOT AS HIGH. LONG TERM...VFR SUNDAY THROUGH MONDAY. IFR/LIFR CEILINGS DEVELOPING MONDAY NIGHT AND PERSISTING THROUGH TUESDAY NIGHT. VFR WEDNESDAY. && .MARINE... SHORT TERM...NO FLAGS EXPECTED WITH HIGH PRESSURE OVERHEAD. LONG TERM...NO FLAGS. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...NONE. NH...NONE. MARINE...NONE. && $$ SYNOPSIS... NEAR TERM...CEMPA SHORT TERM... LONG TERM... AVIATION... MARINE...

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