Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 030132 AFDGYX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAY ME 932 PM EDT THU JUL 2 2015 .SYNOPSIS... HIGH PRESSURE BUILDS ACROSS THE REGION TONIGHT AND REMAINS IN PLACE THROUGH SATURDAY NIGHT...PROVIDING DRY AND MAINLY CLEAR WEATHER RIGHT THROUGH THE FOURTH OF JULY. A WEAK TROUGH OF LOW PRESSURE MOVES TO OUR NORTH ON SUNDAY. HIGH PRESSURE THEN BUILDS IN THROUGH MIDWEEK. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/... 930 PM UPDATE...VERY LITTLE CHANGE TO THE FORECAST AS IT REMAINS ON TRACK. EXPECT THE PLEASANT EVENING TO CONTINUE. 645 PM UDPATE...LITTLE CHANGE TO THE GOING FORECAST. SOME HIGH CLOUDS OVER SOUTHERNMOST ZONES ASSOCIATED WITH A LOW PRESSURE WAVE PASSING WELL TO OUR SOUTH WILL GRADUALLY MOVE AWAY THIS EVENING. DIMINISHING WINDS...MOSTLY CLEAR SKIES...AND COOLING TEMPS ARE EXPECTED FOR THE REMAINDER OF THE EVENING. PREVIOUSLY... SFC HIGH BUILDS IN SLOWLY FROM THE WEST OVERNIGHT...ALTHOUGH WEAK 500 MB TROUGH SWINGS THRU WHICH WILL KEEP A BIT OF GRADIENT FLOW GOING ABV THE BOUNDARY LYR...AND PERHAPS MOVE SOME SCT CIRRUS THRU OVERNIGHT. THE SHELTERED SPOTS SHOULD DECOUPLE...AND SOME VLY FOG IS EXPECTED...ALTHOUGH WITH SOME FLOW AT THE TOP OF THE PBL...WILL BE MORE PATCHY. IT WILL BE CHILLY WITH MINS RANGING FROM THE MID TO UPPER 50S ON THE COAST...TO THE MID 40S IN THE N. && .SHORT TERM /6 AM FRIDAY MORNING THROUGH FRIDAY NIGHT/... WILL SEE THE 500 MB RIDGING BEGIN TO SHIFT IN ON FRIDAY AND THIS WILL ALLOW SFC RIDGE TO BUILD AND WEAKEN GRADIENT FLOW SIGNIFICANTLY. INLAND TEMPS SHOULD BE SIMILAR TO THU...MAY A TOUCH WARMER. ON THE COAST WILL SEE A LIGHT SEA BREEZE DEVELOP...WHICH WILL KEEP MAXES MAYBE A DEGREE OR TWO COOLER THAN THU....INLAND HIGHS RANGE FROM THE LOW TO MID 70S IN THE MTNS...TO AROUND 80 IN INTERIOR SRN NH AND SW ME. FRIDAY NIGHT LOOKS COOL AND CLEAR...AND JUST A TOUCH WARMER THAN TONIGHT...WITH LOWS AGAIN RANGING FROM THE MID TO UPPER 40S N...TO THE MID TO UPPER 50S ON THE COAST. && .LONG TERM /SATURDAY THROUGH THURSDAY/... A RATHER TRANQUIL PATTERN SETTING UP FOR THE OUTLOOK PERIOD ACCOMPANIED BY SUMMER CONDITIONS AND NEAR OR ABOVE NORMAL TEMPERATURES...FINALLY! WE ARE ALSO STAYING IN THE NORTHERN STREAM AND MAINLY BE AFFECTED BY CANADIAN AIR MASSES, SO HUMIDITY LEVELS SHOULD REMAIN AT COMFORTABLE LEVELS. ALTHOUGH THE UPPER AIR PATTERN CONTINUES THE TROUGH IN THE EAST...ALL THE ENERGY AND PRECIPITATION WILL BE STAYING WELL TO OUR SOUTH WITH ONLY VERY MINOR TROUGHS TO QUIETLY MOVE THROUGH EVERY FEW DAYS BUT MOSTLY TO GO UNNOTICED. FORECAST H85 TEMPERATURES ARE MILD AND OTHER THAN SOME AFTERNOON SEABREEZES NO CONSIDERABLE ONSHORE FLOW EXPECTED, THUS THE ABOVE NORMAL TEMPERATURES. THE ONLY TROUGH WORTH MENTIONING IS THE ONE FORECAST TO MOVE THROUGH ON SUNDAY THAT MAY CAUSE SOME SCATTERED SHOWERS BUT WILL BE QUICKLY FOLLOWED BY MORE HIGH PRESSURE AND DRY SUMMER CONDITIONS AGAIN EARLY NEXT WEEK. && .AVIATION /02Z FRIDAY THROUGH TUESDAY/... SHORT TERM...MAINLY VFR THRU FRI NIGHT. ONLY EXCEPTION WILL BE A PERIOD OF VLY FOG TOWARD DAYBREAK AT KHIE/KLEB. LONG TERM...POSSIBLE MVFR CEILINGS SUNDAY NIGHT IN SCATTERED SHOWERS AS A WEAK TROUGH MOVES ACROSS THE REGION. && .MARINE... SHORT TERM...SFC HIGH BUILDS JUST N OF THE WATERS THROUGH FRI NIGHT...WITH GENERALLY LIGHT WINDS AND SEAS IN THE 1-3 FT RANGE AFTER A FEW 4-5 FOOTERS SUBSIDE TONIGHT. EXPECT SOME ENHANCED ONSHORE FLOW IN SEA BREEZE CIRCULATIONS FRI AFTERNOON ALONG THE SHORE. LONG TERM...NO FLAGS FOR THE OUTLOOK PERIOD AS GENERALLY HIGH PRESSURE AND LIGHT WINDS DOMINATE FOR THE OUTLOOK PERIOD. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...NONE. NH...NONE. MARINE...NONE. && $$ NEAR TERM...MLE

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