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
-- Highlight Changed Discussion --
-- Discussion containing changed information from previous version are highlighted. --
000 FXUS61 KGYX 181626 AFDGYX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAY ME ISSUED BY NATIONAL WEATHER SERVICE CARIBOU ME 1226 PM EDT MON AUG 18 2014 .SYNOPSIS... HIGH PRESSURE BUILDS IN FROM CANADA THIS AFTERNOON THROUGH TUESDAY BRINGING FAIR WEATHER. A WEAK FRONT WILL WASHOUT AS IT APPROACHES FROM THE GREAT LAKES LATE THIS WEEK. OTHERWISE...HIGH PRESSURE IS EXPECTED TO BUILD ACROSS THE WESTERN ATLANTIC FOR MUCH OF THE PERIOD. && .NEAR TERM /THROUGH TONIGHT/... 1215 PM UPDATE... UPDATE TO INCREASE SKY AND DECREASE TEMPS JUST A BIT FOR THE REST OF THE DAY ALONG AND UPWIND/NORTHWEST OF THE MOUNTAINS, AS IT`S RUNNING A BIT COOLER/CLOUDIER THERE THAN FORECAST HAD. OTHERWISE NO CHANGES. PREVIOUS DISCUSSION... AN UPPER LVL TROF/JET SEGMENT DRIVES SE ACROSS THE FCST AREA THIS MORNING AS THIS SYSTEM ROTATES AROUND AN UPPER LVL CUTOFF LOW OVER THE MARITIMES. THIS SYSTEM IS PUSHING A COLD FNT OUT TO SEA THIS MORNING. A FEW UPSLOPE -SHRA ACROSS THE MOUNTAINS ...BUT WITH TIME THE PRCP WILL END THIS MORNING WITH CLEARING SKIES ACROSS THE FCST AREA AS HIGH PRES APPROACHES FROM CANADA THIS AFTERNOON. GUSTY NW WINDS SET UP TODAY HELPING TO CLR OUT DOWNSLOPE AREAS THOUGH IT WILL KEEP SOME CLOUDINESS AROUND, MAINLY ACROSS UPSLOPE N/MT ZONES. HIGH TEMPS WILL RANGE FROM THE 60S TO NEAR 70 N TO THE 70S S. USED A BLEND OF MODELS AND MOS GUIDANCE FOR THE NEAR TERM FCST. && .SHORT TERM /TUESDAY THROUGH WEDNESDAY NIGHT/... HIGH PRESSURE BUILDS IN FROM CANADA AND SETTLES OVER NRN NEW ENGLAND TNGT AND TUESDAY. LOW PRESSURE REMAINS OVER THE MARITIMES UNDER AN UPPER LVL CUTOFF SYSTEM...BUT SHOULD BE JUST FAR ENOUGH TO THE N AND E TO NOT IMPACT OUR WX. THE HIGH SHOULD PREVAIL FOR THE MOST PART WITH FAIR WX. UNDER MOSTLY CLR SKIES WITH LGT WINDS VALLEY FOG WILL DEVELOP IN THE FAVORED LOCATIONS...LIKE THE CT RIVER VALLEY AND OTHER VALLEYS ACROSS NH AND INTERIOR WRN MAINE. LOWS TNGT WILL BE QUITE COOL AS THE COOL AIR MASS DROPS IN FROM CANADA. LOOK FOR THE COOLEST NGT WE`VE SEEN IN QUITE SOME TIME WITH LOWS IN THE UPPER 30S TO MID 40S N AND MID 40S TO LOWER 50S S...WITH SOME MID 50S NEAR THE COAST. FAIR WX ON TUESDAY WITH HIGHS A BIT WARMER...MOSTLY IN THE 70S WITH NEAR 80 OVER SOME SRN LOCATIONS AWAY FROM THE COAST WHERE AN AFTERNOON SEA BREEZE SHOULD SET UP UNDER THE LGT PRESSURE GRADIENT ASSOCIATED WITH THE SFC HIGH. USED A BLEND OF MODELS AND MOS GUIDANCE FOR THE NEAR TERM FCST. && .LONG TERM /THURSDAY THROUGH MONDAY/... THE MODELS ARE IN GENERAL AGREEMENT ON THE LONG WAVE PATTERN THROUGH LATE THIS WEEK. WE BEGIN THE PERIOD WITH WEAK RIDGING AND NEAR NORMAL TEMPERATURES. BY THURSDAY...A WEAK IMPULSE AND ASSOCIATED SURFACE DISTURBANCE WILL APPROACH FROM THE GREAT LAKES. THE BLOCK AND HIGH PRESSURE CENTERED JUST OFFSHORE WILL SLOW THE EASTWARD PROGRESSION OF THE GREAT LAKES SYSTEM. ADDITIONALLY...ONSHORE FLOW AND INCREASING CLOUDS WILL RESULT IN SEVERAL DAYS OF SEASONABLY COOL WEATHER FOR THE TAIL-END OF THE WORKWEEK. THE RIDGE WILL ONCE AGAIN REESTABLISH ITSELF BY THE WEEKEND. BUT WITH THE SURFACE HIGH SITUATED OVER THE MARITIMES...WE`LL BE LOCKED INTO A COOL AND PERSISTENT EAST TO NORTHEAST FLOW WITH POTENTIAL FOR MARINE STRATUS TO EVENTUALLY IMPACT SOUTHERN AND COASTAL SECTIONS OF THE FORECAST AREA. && .AVIATION /16Z MONDAY THROUGH FRIDAY/... SHORT TERM /THROUGH TUESDAY/...VFR WITH A COUPLE OF EXCEPTIONS. MVFR CIG/VSBY POSSIBLE IN ANY SHRA THIS MORNING. VALLEY FOG EXPECTED TO FORM AFTER MIDNIGHT TNGT LOWERING TO IFR/LIFR... AFFECTING LEB AND HIE AND PERHAPS CON. LONG TERM... THU - FRI...SCT MVFR PSBL IN SHOWERS. && .MARINE... SHORT TERM /TODAY THROUGH TUESDAY/...UPDATED TO INPUT LATEST OBSERVED DATA RESULTING IN NO MORE THAN MINOR TWEAKS TO THE FCST FOR TODAY. SOME GUSTINESS TO A NW WIND TODAY BUT STILL BELOW SCA LEVELS. WITH HIGH PRESSURE BUILDING IN THRU THE SHORT TERM EXPECT WINDS AND SEAS TO REMAIN BELOW SCA LEVELS. LONG TERM... WINDS AND SEAS ARE EXPECTED TO REMAIN BELOW SMALL CRAFT THRESHOLD. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...NONE. NH...NONE. MARINE...NONE. && $$ NEAR TERM...FOISY

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