Area Forecast Discussion
Issued by NWS Portland, ME

Current Version | Previous Version | Graphics & Text | Print | Product List | Glossary On
Versions: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50
-- Remove Highlighting --
-- Discussion containing changed information from previous version are highlighted. --
000 FXUS61 KGYX 011834 AFDGYX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAY ME 234 PM EDT TUE SEP 1 2015 .SYNOPSIS... A LARGE BLOCKING HIGH PRESSURE SYSTEM WILL BE IN CONTROL THE REST OF THE WEEK AND THROUGH THE WEEKEND INTO NEXT WEEK WITH AN EXTENDED PERIOD OF QUIET WEATHER EXPECTED. TEMPERATURES WILL BE ABOVE NORMAL THROUGH THE PERIOD...WITH GRADUALLY INCREASING HUMIDITY. THE ONLY EXCEPTION BEING THURSDAY AND FRIDAY WHERE A BRIEF COOL DOWN MAY OCCUR BEHIND A WEAK COLD FRONT. && .NEAR TERM /THROUGH TONIGHT/... QUIET NIGHT ON TAP ACROSS THE FORECAST AREA...AS CENTER OF SURFACE HIGH PRES SLIDES SE. INCREASINGLY HUMID AIR WILL LEAD TO ANOTHER ROUND OF VALLEY FOG TONIGHT...WHICH COULD BE DENSE AT TIMES IN THE CT RIVER VALLEY. HAVE ADDED 1/4SM VSBYS TO THE GRIDS AFTER 06Z TONIGHT IN THAT AREA. OTHERWISE TEMPS WILL BE ABOVE NORMAL...AS WARMEST PART OF THE AIR MASS MOVES IN FOR WED. && .SHORT TERM /WEDNESDAY THROUGH WEDNESDAY NIGHT/... WED LOOKS TO BE THE WARMEST OF THE RECENT HOT STRETCH. H8 TEMPS CLIMB TO PLUS 18 TO 20 DEGREES C ACROSS THE ENTIRE FORECAST AREA. FORECAST SOUNDINGS INDICATE WE SHOULD BE ABLE TO MIX TO THIS HEIGHT...AND RESULTING TEMPS WOULD TOP OUT IN THE LOW 90S FOR MUCH OF SRN NH AND SWRN ME. WE ARE MISSING A FEW THINGS THAT COULD PUSH TEMPS EVEN HIGHER...NAMELY ADVECTION WILL BE NEUTRAL TOMORROW...AND FLOW IS RATHER WEAK IN THE BOUNDARY LAYER SO WE LACK MUCH DOWNSLOPE WARMING ON SW FLOW. THE LATTER WILL ALSO MEAN THAT A SEA BREEZE COULD FORCE ITS WAY INLAND ON THE COAST. STILL EXPECTING TEMPS TO CLIMB WELL INTO THE 80S BEFORE ANY MARINE INFLUENCE TAKES OVER THOUGH. WEAK COLD FRONT AGAIN TRIES TO PUSH SWD INTO THE FORECAST AREA FROM CANADA LATE IN THE DAY. MUCH LIKE MON...THIS FRONT IS MOISTURE STARVED. COUPLED WITH A BIT OF A CAP ABOVE H8...CONVECTION WILL HAVE A HARD TIME GETTING GOING AND SUSTAINING THRU THE EVENING. HI-RES CONVECTION ALLOWING MODELS DO FIRE SHOWERS/STORMS IN CANADA DURING THE AFTERNOON...BUT WEAKEN EVERYTHING AS IT ENTERS NRN ZONES. WILL HAVE ISOLATED TSTMS FOR FAR N AROUND AND AFTER 00Z WED...BUT DRY ELSEWHERE UNTIL THU. WITH FRONT CROSSING THE AREA WED NIGHT...VALLEY FOG SHOULD BE A LITTLE LESS WIDESPREAD. && .LONG TERM /THURSDAY THROUGH TUESDAY/... A COLD FRONT WILL CONTINUE TO SLOWLY MOVE SOUTH THROUGH SOUTHERN AREAS BY THURSDAY MORNING AND MOVING SOUTH OF THE AREA IN THE AFTERNOON. THERE MAY BE WIDELY SCATTERED SHOWERS ON THURSDAY ALONG AND BEHIND THIS THIS FRONT. A BRIEF COOL DOWN TO SEASONAL TEMPERATURES EXPECTED FOR THURSDAY AND INTO FRIDAY AS CANADIAN HIGH PRESSURE BUILDS SOUTH INTO THE AREA. BY THE WEEKEND THE LARGE BLOCKING HIGH PRESSURE SYSTEM WILL GRADUALLY BUILD AND ALLOW A SOUTHWEST FLOW TO DEVELOP AS ITS CENTER GETS ALIGNED ALONG THE COAST. A RETURN TO VERY WARM AND EVEN HOT CONDITIONS WITH HIGHER HUMIDITIES ARE EXPECTED OVER THE WEEKEND AND INTO NEXT WEEK WITH PLENTY OF SUNSHINE AS STRONG SUBSIDENCE WILL BE THE RULE UNDER THIS LARGE DOME OF BLOCKING HIGH PRESSURE. SUPERBLEND MODEL WILL BE GENERALLY ACCEPTED...TEMPERATURES OVER THE WEEKEND INTO EARLY NEXT WEEK MAY BE A LITTLE LOW DUE TO THE WEIGHTS OF CLIMO INTO THE MODELS. && .AVIATION /18Z TUESDAY THROUGH SUNDAY/... SHORT TERM...VFR CONDITIONS ARE EXPECTED TO PREVAIL DURING THE DAY THRU WED NIGHT. VALLEY FOG WILL BE LIKELY AGAIN TONIGHT...WITH CONDITIONS QUICKLY DROPPING TO LIFR AT LEB AND HIE AFTER 06Z. LEANED MAINLY ON PERSISTENCE FROM LAST NIGHT TO TIME FOG AT TERMINALS. LATE WED EVE VERY ISOLATED SHRA ARE POSSIBLE AT HIE...BUT CHANCES ARE LOWER THAN 30 PERCENT. LONG TERM...VFR THROUGH THE OUTLOOK PERIOD. && .MARINE... SHORT TERM...WINDS AND SEAS WILL REMAIN BELOW SCA THRESHOLDS. LONG TERM...WINDS AND SEAS TO REMAIN LIGHT. && .CLIMATE... WHILE TEMPERATURES WILL SOAR INTO THE 80S ALONG THE COAST TO THE LOWER 90S INLAND ON WEDNESDAY...THIS WILL BE WELL ABOVE NORMAL BUT LIKELY NOT SET RECORDS FOR SEPT 2ND. THE RECORD HIGH AT CONCORD ON WEDNESDAY IS 98 DEGREES...WHILE IT IS 94 DEGREES AT PORTLAND. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...NONE. NH...NONE. MARINE...NONE. && $$ LEGRO/MARINE

USA.gov is the U.S. government's official web portal to all federal, state and local government web resources and services.