Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 060130 AAB AFDGYX AREA FORECAST DISCUSSION...UPDATED NATIONAL WEATHER SERVICE GRAY ME 830 PM EST THU MAR 5 2015 .SYNOPSIS... HIGH PRESSURE WILL BUILD SOUTH OF NEW ENGLAND TONIGHT THROUGH FRIDAY. A COLD FRONT WILL APPROACH FROM THE NORTHWEST ON SATURDAY AND WILL CROSS THE AREA SATURDAY NIGHT. WEAK HIGH PRESSURE WILL BUILD IN FROM THE NORTHWEST SUNDAY. A WEAK COLD FRONT WILL CROSS THE REGION ON MONDAY. A WARM FRONT WILL CROSS THE REGION ON TUESDAY. HIGH PRESSURE WILL BUILD SOUTH OF NEW ENGLAND ON WEDNESDAY. && .NEAR TERM /THROUGH FRIDAY/... UPDATE...CLEARING HAS MOVED INTO ALL BUT THE COAST AND SRN NH AT THIS HOUR. TEMPS ACROSS THE NRN VALLEYS ARE APPROACHING...IF NOT ALREADY BELOW ZERO. HAVE TWEAKED HOURLY TEMPS THRU MIDNIGHT TO ACCOUNT FOR LATEST OBSERVATIONAL TRENDS. PREVIOUS DISCUSSION...SURFACE HIGH PRESSURE CONTINUES TO BUILD IN ACROSS THE AREA ALONG WITH COLD AIR ADVECTION...WHICH HAS BEEN DROPPING OUR TEMPERATURES THROUGHOUT THE DAY. MID TO UPPER LEVEL CLOUDS WILL CONTINUE TO PUSH SOUTH THIS EVENING AND MOST AREAS SHOULD BECOME FAIRLY CLEAR BY MIDNIGHT WITH THE EXCEPTION OF MAYBE SOUTHERN CHESHIRE AND HILLSBOROUGH COUNTIES IN NEW HAMPSHIRE. THE NORTHERN CWA SHOULD BE ABLE TO RADIATE MOST EFFICIENTLY TONIGHT AS CLOUDS MOVE OUT OF THERE FIRST AND THE BOUNDARY LAYER DECOUPLES WITH USUAL COLD SPOTS ACROSS DROPPING POSSIBLY BETWEEN 15 AND 20 BELOW ZERO. && .SHORT TERM /FRIDAY NIGHT/... HIGH PRESSURE REMAINS OVERHEAD TOMORROW...AND ALTHOUGH WE WILL START OFF QUITE COLD...THE STRONG MARCH SUNSHINE SHOULD CREATE QUITE A LARGE DIURNAL SWING AS TEMPERATURES COULD CLIMB 25-30 DEGREES IN SOME SPOTS DURING THE DAYTIME HOURS. A WEAK WAVE WILL APPROACH FRIDAY NIGHT INTO SATURDAY MORNING AND THIS WILL INCREASE CLOUDS TOMORROW NIGHT AND BRING A SLIGHT CHANCE OF A SNOW SHOWER IN THE MOUNTAINS BY SATURDAY MORNING. && .LONG TERM /SATURDAY THROUGH THURSDAY/... HIGH PRESSURE WILL BUILD SOUTH OF NEW ENGLAND ON SATURDAY AS A WEAK COLD FRONT APPROACHES FROM THE NORTHWEST. THE DAY WILL FEATURE VARIABLE CLOUDS WITH A STRAY SNOW SHOWER POSSIBLE IN NORTHERN SECTIONS. HIGHS WILL RANGE FROM THE MID 20S NORTH TO THE LOWER 30S SOUTH. COLD FRONT WILL CROSS THE REGION SATURDAY NIGHT. MOSTLY CLOUDY SKIES AND SCATTERED SNOW SHOWERS WILL GIVE WAY TO PARTIAL CLEARING AFTER MIDNIGHT DOWNWIND OF THE MOUNTAINS. ELSEWHERE SKIES WILL REMAIN MOSTLY CLOUDY WITH A SLIGHT CHANCE OF SNOW SHOWERS IN THE NORTH. LOWS WILL ONCE AGAIN FALL TO BELOW NORMAL LEVELS WITH READINGS BY EARLY SATURDAY OF 5 TO 15 NORTH AND IN THE TEENS SOUTH. WEAK HIGH PRESSURE BUILDS IN FROM THE NORTHWEST ON SUNDAY. LINGERING FRONTAL TROUGH WILL KEEP VARIABLE CLOUDINESS ACROSS THE REGION FOR MOST OF THE DAY. HIGH TEMPS WILL RANGE FROM THE MID 20S TO MID 30S. WEAK LOW PRESSURE CROSSING SOUTHERN CANADA SUNDAY NIGHT WILL DRIVE A COLD FRONT THROUGH THE REGION MONDAY BRINGING JUST A GLANCING BLOW OF COOLER AIR MAINLY INTO NORTHERN ZONES. EXPECT MOSTLY CLOUDY SKIES WITH JUST A CHANCE OF A SNOW SHOWER. HIGH WILL RANGE THROUGH THE 30S. SHALLOW RIDGE BUILDING IN FROM THE WEST WILL BRING CLEARING SKIES MONDAY EVENING ALTHOUGH LOW LEVEL MOISTURE WILL KEEP CLOUDS IN THE NORTH. OVERNIGHT LOWS WILL RANGE THROUGH THE TEENS TO NEAR 20. HIGH PRESSURE SHIFTS OFFSHORE ON TUESDAY AND RETURN FLOW WILL BRING WARMER AIR BACK INTO THE AREA. EXPECT MOSTLY CLOUDY SKIES IN NORTHERN SECTIONS CLOSER TO THE WARM FRONT. WILL LIKELY ALSO INCLUDE SOME LOW CHANCE POPS FOR SNOW SHOWERS BUT MOST OF THIS ACTIVITY SHOULD REMAIN NORTH OF THE BORDER. HIGH TEMPS WILL FINALLY TOP OUT NEAR NORMAL WITH MID 30S NORTH TO LOWER 40S SOUTH. WARMER WEATHER WILL CONTINUE ON WEDNESDAY AS ANOTHER AREA OF HIGH PRESSURE BUILDS SOUTH OF NEW ENGLAND. EXPECT MOSTLY CLOUDY SKIES TO PERSIST IN THE NORTH WITH A CHANCE OF A RAIN OR SNOW SHOWER IN THE AFTERNOON AS ANOTHER WARM FRONT PUSHES THROUGH SOUTHERN CANADA. PARTLY TO MOSTLY SUNNY SKIES WILL PREVAIL IN THE SOUTH. HIGHS WILL REACH THE LOWER TO MID 40S IN MOST LOCATIONS. COLD FRONT WILL APPROACH FROM THE NORTHWEST WEDNESDAY NIGHT AND WILL PUSH THROUGH THE REGION ON THURSDAY. SHOULD SEE ONE MORE WARM DAY AS COLD AIR LAGS BEHIND THE FRONT. LOOKING FOR LITTLE IF ANY SHOWER ACTIVITY WITH THE FROPA. HIGHS WILL TOP OUT NEAR 40 BEFORE DROPPING BACK LATER IN THE AFTERNOON. && .AVIATION /02Z FRIDAY THROUGH TUESDAY/... SHORT TERM...VFR CONDITIONS ARE EXPECTED OVER THE ENTIRE PERIOD WITH HIGH PRESSURE OVERHEAD. LONG TERM...VFR SATURDAY. AREAS MVFR CEILINGS/VSBY SATURDAY NIGHT AND SUNDAY. VFR MONDAY AND TUESDAY. && .MARINE... SHORT TERM...SCAS WILL CONTINUE WITH SOME GUSTY WINDS BEHIND COLD FRONT. COLD AIR ALONG WITH THE GUSTY WINDS WILL MAKE IT FAVORABLE FOR FREEZING SPRAY ACROSS ALL AREAS TONIGHT THROUGH TOMORROW MORNING. LONG TERM...SCA`S MAY BE NEEDED LATE MONDAY. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...NONE. NH...NONE. MARINE...FREEZING SPRAY ADVISORY UNTIL 7 AM EST FRIDAY FOR ANZ150>154. SMALL CRAFT ADVISORY UNTIL 7 AM EST FRIDAY FOR ANZ150-152-154. && $$ NEAR TERM...LEGRO

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