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 260721 AFDGYX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAY ME 321 AM EDT SAT JUL 26 2014 .SYNOPSIS... HIGH PRESSURE OVER THE REGION MOVES INTO THE WESTERN ATLANTIC ON TODAY. AN UPPER LEVEL TROUGH OF LOW PRESSURE MOVES INTO THE AREA ON SUNDAY AND BRINGS SHOWERS AND ISOLATED THUNDERSTORMS THROUGH MONDAY OR TUESDAY. HIGH PRESSURE BUILDS IN AGAIN FOR LATER IN THE WEEK. && .NEAR TERM /UNTIL 6 PM THIS EVENING/... SMOKE FROM FOREST FIRES 2500 MILES AWAY CONTINUES TO LEAVE MUCH OF THE AREA IN A HZ THIS MORNING. IN FACT IF YOU GET OUTSIDE BEFORE SUNRISE BEGINS TO MIX THE BOUNDARY LAYER...YOU MAY BE ABLE TO SMELL THE SMOKE IN THE AIR. UNTIL THAT TIME WILL KEEP HZ IN THE GRIDS. ATTM PATCHY VALLEY FOG IS ALSO DEVELOPING. THESE VSBY RESTRICTIONS WILL PERSIST THRU ABOUT 12Z. INCREASING SW FLOW TODAY WILL AID IN CLEARING OUT THE SMOKE...AS WELL AS BUMPING TEMPS UP A FEW DEGREES FROM FRI. EXPECT ANOTHER AFTERNOON OF DIURNAL CU DEVELOPMENT...AND PERHAPS A FEW SHOWERS IN THE HIGH TERRAIN. LAPSE RATES ARE FAIRLY POOR...SO HAVE NOT ADDED THUNDER TO THE FORECAST. && .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SUNDAY/... AN APPROACHING COLD FNT WILL BEGIN TO SPREAD CLOUDS ACROSS THE AREA TONIGHT. THAT AND CONTINUED SW FLOW WILL KEEP TEMPS MORE ON THE MILD SIDE...ESPECIALLY COMPARED TO THE PAST COUPLE OF OVERNIGHTS. BY SUN FNT WILL TRY AND CROSS THE AREA. AS IT DOES SO EXPECT WIDESPREAD SHOWER ACTIVITY. LAPSE RATES DO IMPROVE FOR THE AFTERNOON...SO THUNDER REMAINS IN THE FORECAST. THE BEST THERMODYNAMIC PROFILE WILL BE MUCH FARTHER SW...ACROSS THE MID ATLANTIC...HOWEVER CANNOT RULE OUT AN ISOLD STRONGER STORM...ESPECIALLY IN SRN ZONES AS SHEAR WILL BE SUPPORTIVE OF ORGANIZED UPDRAFTS. && .LONG TERM /SUNDAY NIGHT THROUGH FRIDAY/... A L/WV TROF PRODUCING A BROAD CYCLONIC FLOW GETS CARVED OUT AND SHARPENS TO OUR WEST SUN NIGHT AND THRU NEXT WEEK. AN INITIAL STRONG S/WV ROTATES THRU THIS TROF INTO NEW ENGL SUN NIGHT AND INTO TUE BEFORE MOVING EWD...THUS NUMEROUS SHWRS/TSTMS ARE EXPECTED IN THAT TIME FRAME. BY MIDWEEK SOME CLEARING TAKES PLACE BUT SOME CLDS AND A FEW DIURNAL AFTN SHWRS MAY DEVELOP AS THE THE MEAN L/WV TROF REMAINS TO OUR W. USED A BLEND OF MODELS...HPC GUIDANCE FOR QPF...FOR THE OUTLOOK PERIOD. && .AVIATION /07Z SATURDAY THROUGH WEDNESDAY/... SHORT TERM...SMOKE FROM FOREST FIRES IN CANADA CONTINUES TO LEAVE THE AREA IN A HZ. THIS SHOULD GRADUALLY DISPERSE TODAY...ESPECIALLY AS WINDS PICK UP FROM THE SW. UNTIL THEN HZ AND PATCHY VALLEY FOG WILL BE POSSIBLE. OTHERWISE EXPECT VFR CONDITIONS THRU THE DAY SAT. TONIGHT AND ESPECIALLY INTO SUN...AN APPROACHING COLD FNT WILL BRING A CHANCE FOR RNFL AND MVFR OR LOWER CONDITIONS. LONG TERM...UNSETTLED WX WITH SHRA/TSTMS AND MVFR/IFR CONDITIONS THRU TUE WITH SLOWLY IMPROVING CONDITIONS TUE AND VFR CONDS BY WED. && .MARINE... SHORT TERM...SOUTHWEST FLOW STRENGTHENS OVER THE WATERS AS THE CENTER OF HIGH PRESSURE MOVES OFFSHORE AND A TROUGH OF LOW PRESSURE APPROACHES FROM THE WEST. CURRENTLY EXPECT WINDS TO STAY BELOW SCA LEVELS. GUIDANCE CONTINUES TO FORECAST 5 TO 6 FT SEAS BY SUN...HOWEVER THIS IS TYPICALLY AN OVERESTIMATE IN SW FLOW. A MARGINAL SCA MAY BE NEEDED SUN REGARDLESS. LONG TERM...S FLOW AHEAD OF AN APPROACHING COLD FNT WILL LIKELY WARRANT A SCA OVER THE OUTER WATERS SUNDAY NIGHT THRU MONDAY NIGHT MAINLY DUE TO BUILDING SEAS BUT POSSIBLY FOR SOME WIND GUSTS AS WELL. THE FNT STALLS NEAR OR JUST E OF THE WATERS TUESDAY THRU WEDNESDAY KEEPING WINDS AND SEAS BELOW SCA LEVELS. && .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.