Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 221921 AFDGYX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAY ME 321 PM EDT FRI AUG 22 2014 .SYNOPSIS...
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A WEAK WARM FRONT WILL GRADUALLY BE SUPPRESSED TO THE SOUTH TONIGHT THROUGH SATURDAY AS HIGH PRESSURE BUILDS IN FROM THE NORTH. HIGH PRESSURE WILL REMAIN IN CONTROL OVER THE NORTHEAST SUNDAY THROUGH TUESDAY. A COLD FRONT WILL SLOWLY APPROACH FROM THE NORTH ON WEDNESDAY. A SECONDARY FRONT WILL CROSS THE REGION THURSDAY.
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&& .NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
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A WEAK BOUNDARY REMAINS DRAPED ACROSS THE CWFA ATTM. THIS CONVERGENT ZONE IS THE FOCUS FOR SHOWERS...MAINLY FROM A KHIE TO KPWM LINE AND SWWD. SOME WIDELY SCT DIURNAL SHOWERS ARE ALSO POSSIBLE THRU THIS EVENING IN THE HIGHER TERRAIN OF WRN ME. THE DIURNAL SHOWERS WILL DISSIPATE QUICKLY...WHILE THOSE ASSOCIATED WITH THE CONVERGENT AXIS WILL HAVE A LITTLE MORE STAYING POWER INTO THE EVENING. OTHERWISE...WE WILL SEE A SLOW CLEARING TREND AS THE CONVECTIVE CLOUDS BREAK UP. THESE POCKETS OF CLEARING WILL HELP TEMPS COOL QUICKLY. EXPECT THAT THERE WILL BE A FEW AREAS OF VALLEY FOG COINCIDENT WITH THESE HOLES IN THE CLOUD COVER.
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&& .SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/...
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MOST AREAS SHOULD SEE SOME SUN IN THE MORNING...BUT THIS WILL QUICKLY GIVE WAY TO CLOUDS AS DAYTIME HEATING COMMENCES. THESE WILL MOSTLY BE DIURNAL IN NATURE...AS THE CONVERGENT ZONE CONTINUES TO MOVE AWAY FROM THE REGION. EXPECT AN EARLY AFTERNOON PEAK IN CLOUD COVER...ALONG WITH SCT SHOWERS MOVING SWWD IN THE NELY FLOW. THIS WILL BE A COOL FLOW AS WELL...AND SEASONABLY COOL HIGH TEMPS ARE EXPECTED YET AGAIN...DESPITE BEING A FEW DEGREES WARMER THAN TODAY. CLEARING WILL ONCE AGAIN LEAD TO QUICKLY COOLING TEMPS AT NIGHT...WITH ANOTHER ROUND OF VALLEY FOG LIKELY BEING MORE WIDESPREAD AS HIGH PRES TAKES CONTROL.
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&& .LONG TERM /SUNDAY THROUGH FRIDAY/...
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CANADIAN HIGH PRESSURE WILL REMAIN OVER THE REGION ON SUNDAY AND MONDAY. THIS WILL BRING SEASONABLY COOL CONDITIONS WITH SEA BREEZES ALONG THE COAST DURING THE AFTERNOON. A MODERATING TREND WILL CONTINUE INLAND AHEAD OF A SLOW MOVING FRONT ON WEDNESDAY. THEREAFTER...THERE WILL BE A RISK FOR SCATTERED SHOWERS OR ISOLD THUNDERSTORMS ON THURSDAY WITH THE PASSAGE OF A COLD FRONT DURING THE DAY. THERE CONTINUES TO BE TIMING DIFFERENCES IN THE MODELS THAT HAVE YET TO BE RESOLVED. HIGH PRESSURE WILL BUILD IN BEHIND THE FRONT...AS ANY TROPICAL ACTIVITY REMAINS WELL OFF THE EAST COAST.
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&& .AVIATION /19Z FRIDAY THROUGH WEDNESDAY/...
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SHORT TERM...SCT MVFR CONDITIONS WILL PERSIST INTO THIS EVENING. CIGS WILL GENERALLY REMAIN ABOVE 2000 FT IN SHRA...BUT VSBYS WILL REMAIN P6SM. PARTIAL CLEARING TONIGHT WILL RESULT IN SOME PATCHY VALLEY FOG. NOT CONFIDENT IN DEGREE OF CLEARING...SO DIDN/T HIT IT HARD IN THE TAFS...OPTING FOR A TEMPO 2SM AT THE FAVORED LOCATIONS. COULD SEE MORE WIDELY SCT SHRA SAT ACROSS THE INTERIOR...BUT GENERALLY EXPECT MVFR OR BETTER CONDITIONS IN THESE. MORE WIDESPREAD CLEARING SAT NIGHT SHOULD LEAD TO MORE EXTENSIVE VALLEY FOG AND IFR OR LOWER CONDITIONS. LONG TERM...GENERALLY VFR CONDITIONS.
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&& .MARINE...
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NO FLAGS.
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&& .GYX WATCHES/WARNINGS/ADVISORIES... ME...NONE. NH...NONE. MARINE...NONE. && $$ LEGRO/JC

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