Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 041858 AFDGYX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAY ME 258 PM EDT FRI SEP 4 2015 .SYNOPSIS... HIGH PRESSURE WILL BUILD SOUTH FROM CANADA THROUGH SATURDAY, THEN MOVE OFFSHORE SATURDAY NIGHT. THIS HIGH WILL PROVIDE THE REGION WITH A RESPITE IN THE HEAT AND HUMIDITY AT LEAST FOR A LITTLE WHILE. HOWEVER...THE HEAT AND HUMIDITY WILL RETURN SUNDAY AS THE HIGH ANCHORS OFF THE COAST. JULY-LIKE WEATHER IS EXPECTED MONDAY INTO WEDNESDAY. A SLOW-MOVING COLD FRONT WILL CROSS THE AREA THURSDAY INTO FRIDAY WITH SHOWERS AND THUNDERSTORMS. && .NEAR TERM /THROUGH TONIGHT/... A LARGE SURFACE/UPPER RIDGE OF HIGH PRESSURE IS CURRENTLY OVER THE AREA. CLEAR SKIES AND LIGHT WINDS TONIGHT WILL PROVIDE RADIATIONAL COOLING SO A COOL NIGHT WILL BE EXPECTED WITH TEMPERATURES DROPPING INTO THE 40S TO LOWER 50S. AREAS OF VALLEY FOG ARE EXPECTED LATER TONIGHT. && .SHORT TERM /SATURDAY THROUGH SATURDAY NIGHT/... HIGH PRESSURE ANCHORED OVER THE REGION WILL PROVIDE SUNNY SKIES AND LIGHT WINDS WITH TEMPERATURES RECOVERING TO NEAR OR SLIGHTLY ABOVE SEASONAL LEVELS. HIGH PRESSURE REMAINS CENTERED OVER THE AREA SAT NIGHT WITH CLEAR SKIES AND CALM WINDS. OVERNIGHT LOWS WILL NOT BE AS COOL EVEN WITH THE RADIATIONAL COOLING IN PLACE. AREAS OF VALLEY FOG IS EXPECTED LATER AT NIGHT. USED A BLEND OF MODEL TEMPS. && .LONG TERM /SUNDAY THROUGH FRIDAY/...
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THE UPPER LEVEL PATTERN BEGINS IN NEAR ZONAL FLOW FOR SUNDAY INTO MONDAY. BY THE END OF THE WORK WEEK A DEEP TROUGH IS CARVED OUT OVER THE EASTERN THIRD OF THE CONUS AND WILL BE MOVING TOWARDS NEW ENGLAND. HIGH TEMPERATURES WILL HOVER IN THE UPPER 80S TO LOWER 90S SUNDAY THROUGH WEDNESDAY WITH A CHANCE OF SHOWERS OVER THE HIGHER TERRAIN... ESPECIALLY DURING THE HEAT OF THE DAY. PRECIPITATION CHANCES INCREASE FOR THE ENTIRE AREA FOR THE LATTER HALF OF THE WEEK. ON THURSDAY A BOUNDARY BEGINS TO MOVE THROUGH THE REGION BRINGING WIDESPREAD SHOWERS AND A FEW THUNDERSTORMS. SLIGHTLY COOLER AIR MOVES IN BEHIND THIS BOUNDARY WITH MOST LOCATIONS IN THE 70S ON FRIDAY. A REINFORCING FRONT... ASSOCIATED WITH A POTENT SHORT WAVE AND THE AFOREMENTIONED UPPER LEVEL TROUGH... SWEEPS THROUGH LATE FRIDAY BRINGING HEAVIER RAIN AND PERHAPS A FEW SIGNIFICANT THUNDERSTORMS.
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&& .AVIATION /17Z FRIDAY THROUGH TUESDAY/... SHORT TERM...VFR THROUGH SATURDAY. HOWEVER...LOCAL IFR CONDITIONS IN RIVER VALLEY FOG WILL OCCUR IN RIVER VALLEYS LATE TONIGHT AND EARLY SATURDAY MORNING. LONG TERM...LOCAL IFR POSSIBLE MONDAY AND TUESDAY MORNING IN VALLEY FOG AND STRATUS. && .MARINE... SHORT TERM...WINDS AND SEAS TO REMAIN LIGHT. NO FLAGS ARE THROUGH SATURDAY NIGHT. LONG TERM...MONDAY NIGHT INTO TUESDAY...SMALL CRAFT WINDS AND SEAS ARE POSSIBLE AS THE SURFACE PRESSURE GRADIENT TIGHTENS. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...NONE. NH...NONE. MARINE...NONE. && $$ MARINE/HANES

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