Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 162338 AFDGYX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAY ME 738 PM EDT TUE SEP 16 2014 .SYNOPSIS... A WEAK COLD FRONT WILL PUSH OFFSHORE TONIGHT. A STRONGER SECONDARY COLD FRONT WILL APPROACH FROM THE NORTH AND CROSS THE WATERS LATE WEDNESDAY. HIGH PRESSURE WILL BUILD IN FROM THE WEST THURSDAY THROUGH FRIDAY. HIGH PRESSURE WILL SHIFT OFFSHORE FRIDAY NIGHT AND WILL HOLD OFF THE COAST THROUGH SATURDAY. && .NEAR TERM /UNTIL 6 AM WEDNESDAY MORNING/...
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735 PM UPDATE: ONLY MINOR TWEAKS TO CLOUD COVER AND TEMPS BASED ON CURRENT CONDITIONS OTRW NO OTHER CHANGES ATTM. PREV DISC: SKIES WILL CONTINUE TO SLOWLY BEGIN TO CLEAR ACROSS THE REGION THROUGH EARLY THIS EVENING. WITH CLEAR SKIES...LIGHT WINDS AND MOISTURE FROM TODAYS RAINS...EXPECT AREAS OF FOG TO DEVELOP TONIGHT ACROSS THE INTERIOR SHELTERED VALLEYS. THIS WILL PREVENT ANY FROST WITH MINIMUM TEMPERATURES HOLDING INTO THE UPPER 30S IN THE MOUNTAINS WITH 40S ELSEWHERE.
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&& .SHORT TERM /6 AM WEDNESDAY MORNING THROUGH WEDNESDAY NIGHT/... MORE SUNSHINE WILL BE ON TAP FOR WEDNESDAY AS A RIDGE OF HIGH PRESSURE ENTERS NORTHERN NEW ENGLAND. THERE WILL BE A WEAK WEATHER DISTURBANCE APPROACHING FAR NORTHERN MAINE LATE IN THE DAY. THIS MAY BRING SOME CLOUDINESS TO THE NORTHERN MOUNTAIN AREAS. BY WEDNESDAY NIGHT...EXPECT MORE PATCHY FOG TO DEVELOP. WE WILL BE INTRODUCING SLIGHT CHANCE POPS FOR THE FAR NORTHERN AREAS WITH THE APPROACH AND EVENTUAL PASSAGE OF ANOTHER COLD FRONT. THIS WILL SET THE STAGE FOR ONE OF THE COLDEST PERIODS THIS SEPTEMBER IN THE LONG TERM PORTION OF THE FORECAST. && .LONG TERM /THURSDAY THROUGH TUESDAY/... THE EARLY PART OF THE EXTENDED WILL BE DOMINATED BY THE STRONG COLD FNT HEADED THRU THE REGION ON THU. AHEAD OF THE FNT SW FLOW AND SOME COMPRESSIONAL WARMING WILL BUMP HIGHS UP INTO THE 60S FOR THE COASTAL PLAIN. COLD AIR WILL LIKELY SNEAK INTO THE NRN ZONES BEFORE SUNRISE...SO HIGHS SHOULD OCCUR EARLY IN THE DAY. THIS NRN STREAM SYSTEM WILL BE MOISTURE STARVED...SO DO NOT EXPECT MUCH IN THE WAY OF PCPN. THE COOL NW FLOW OVER THE TERRAIN WILL BE THE GREATEST SOURCE OF SHOWERS...BUT EVEN THEN ONLY SCHC TO CHC POP. CAA CONTINUES FIRST HALF OF THU NIGHT BEFORE HIGH PRES SETTLES OVERHEAD. CLEAR AND CALM PRIOR TO SUNRISE WILL SUPPORT IDEAL RADIATIONAL COOLING. H8 TEMPS ALOFT NEAR -2C IN THE N TO 0C IN THE S WILL SUPPORT WIDESPREAD 30S DOWN TO MID 20S IN SHELTERED NRN VALLEYS. FOR MUCH OF THE NRN HALF OF THE FORECAST AREA THIS WILL BRING AN END TO THE GROWING SEASON. HIGH CENTERED OVERHEAD FRI WILL INHIBIT MIXING...DESPITE FULL SUNSHINE. AS A RESULT HIGH TEMPS WILL STRUGGLE INTO THE UPPER 50S. THE RECORD COLD HIGH TEMP FOR KPWM ON FRI IS 58...SO THIS IS A VERY CHILLY AIR MASS FOR THIS TIME OF YEAR. WARMTH IS QUICK TO FOLLOW HOWEVER...WITH HIGH PRES SLIDING OFFSHORE AND RETURN FLOW DEVELOPING. THIS WILL BRING TEMPS BACK TO SEASONABLE...AND POSSIBLY EVEN MILDER THAN NORMAL BY SUN AFTERNOON. THIS WILL BRING ANOTHER CHANCE AT RAIN HOWEVER...AS LOW PRES MOVING THRU CANADA DRAGS A COLD FNT ACROSS NEW ENGLAND EARLY NEXT WEEK. && .AVIATION /00Z WEDNESDAY THROUGH SUNDAY/... SHORT TERM...AREAS OF FOG DEVELOPING WITH CLEARING SKIES TONIGHT. LIFR CONDITIONS OVER MANY INLAND AREAS...ESPECIALLY IN SHELTERED VALLEYS. CONDITIONS IMPROVING TOMORROW WITH PATCHY FOG REDEVELOPING WEDNESDAY NIGHT. LONG TERM...VFR PREVAILS THRU SAT AS HIGH PRES REMAINS IN CONTROL. DIGGING TROF OVER THE WEEKEND WILL EVENTUAL PUSH A WARM FNT FOLLOWED BY A COLD FNT THRU THE REGION. EXPECT A PERIOD OF SHOWERS AND MVFR OR LOWER CONDITIONS WITH THESE FEATURES. && .MARINE... SHORT TERM...MODELS APPEAR TO BE OVERFORECASTING SWELL HEIGHTS FROM HURRICANE EDOUARD. HAVE COLLABORATED WITH ADJACENT OFFICES. WILL NOT BE ISSUING SCAS FOR SEAS AT THIS TIME. SWELLS SHOULD EVENTUALLY BUILD LATER ON WEDNESDAY. LONG TERM...SCA WINDS AND SEAS ARE POSSIBLE THU BEHIND COLD FNT. DID UNDERCUT MODEL WIND SPEEDS OVER THE WATERS FOR THE LATE WEEKEND AND EARLY NEXT WEEK...AS THEY TYPICALLY OVERFORECAST SW FLOW. HOWEVER...SUSTAINED SLY FLOW WILL GRADUALLY BUILD SEAS INTO EARLY NEXT WEEK. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...NONE. NH...NONE. MARINE...NONE. && $$

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