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 282000 AFDGYX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAY ME 300 PM EST SAT FEB 28 2015 .SYNOPSIS... HIGH PRESSURE WILL CREST OVER THE REGION THIS EVENING BEFORE SHIFTING OFFSHORE SUNDAY. WEAK LOW PRESSURE CROSSES THE REGION SUNDAY NIGHT...PRODUCING SOME ACCUMULATING SNOW...BEFORE MOVING INTO THE CANADIAN MARITIMES ON MONDAY. HIGH PRESSURE CROSSES THE AREA MONDAY NIGHT AND TUESDAY. LOW PRESSURE WILL MOVE OUT OF THE GREAT LAKES TUESDAY NIGHT AND WILL TRACK NORTHEAST THROUGH THE ST LAWRENCE VALLEY ON WEDNESDAY...BRINGING A ROUND OF MIXED PRECIPITATION TO THE AREA. A COLD FRONT FOLLOWS WEDNESDAY NIGHT. HIGH PRESSURE BUILDS IN FOR THE END OF THE WEEK. && .NEAR TERM /THROUGH TONIGHT/... THE COLDEST MONTH EVER FOR PORTLAND MAINE WILL BE IN THE BOOKS SHORTLY. LAST NIGHT WAS NEAR RECORD COLD AS WELL...WITH A LOW OF MINUS 7 IN THE FOREST CITY. THIS IS JUST SHY OF THE RECORD LOW OF MINUS 9 SET BACK IN 1950. WITH CLEAR SKIES AND LIGHT WINDS...EXPECT RADIATIONAL COOLING ONCE AGAIN TONIGHT. WILL FORECAST ON THE LOWER END OF THE 12Z MODEL SUITE WITH READINGS APPROACHING ZERO NEAR THE COASTLINE AND BELOW ZERO OVER INTERIOR LOCATIONS. HIGH CLOUDS WILL BE ARRIVING LATER TONIGHT. THIS MAY KEEP READINGS FROM TRUELY BOTTOMING OUT AS WAS THE CASE LAST NIGHT. && .SHORT TERM /SUNDAY THROUGH SUNDAY NIGHT/... A BROAD AND WEAK AREA OF WARM AIR ADVECTION WILL ALLOW CLOUDS TO THICKEN ON SUNDAY ACROSS THE FORECAST AREA. LIGHT SNOW WILL BREAK OUT SUNDAY NIGHT AS THIS DEVELOPING MOISTURE INTERACTS WITH AN APPROACHING UPPER LEVEL TROUGH. SURFACE LOW PRESSURE WILL FORM IN THE GULF OF MAINE LATE SUNDAY NIGHT...BUT LIKELY TOO LATE TO BRING APPRECIABLE MOISTURE AND SNOWFALL TO THE REGION. NEVERTHELESS...THERE WILL BE A TWO TO AS MUCH AS FOUR INCHES OF SNOW OVER SOUTHERNMOST PORTIONS OF THE FORECAST AREA. FURTHER TO THE NORTH...AS HAS BEEN THE CASE MUCH OF THIS WINTER...LESS SNOW WILL FALL. TEMPERATURES WILL BE MODERATING BUT STILL BELOW NORMAL FOR THIS TIME OF THE YEAR. && .LONG TERM /MONDAY THROUGH SATURDAY/... A SURFACE LOW EXITS RAPIDLY EAST INTO THE MARITIMES MONDAY WHILE THE UPPER TROF MOVES THROUGH NORTHERN NEW ENGLAND. THE PRECIPITATION WILL QUICKLY COME TO AN END EARLY MONDAY AS DOWNSLOPING NORTHWEST WINDS KICK IN. HIGH PRESSURE BUILDS INTO THE AREA MONDAY NIGHT AND TUESDAY. A FAST MOVING SHORT WAVE WITH ASSOCIATED WARM AIR ADVECTION OVERUNNING PRECIPITATION WILL MOVE INTO THE AREA TUESDAY NIGHT IN THE FORM OF SNOW. SEVERAL INCHES OF SNOW IS EXPECTED THROUGHOUT THE AREA. BY WEDNESDAY MORNING A BRIEF CHANGEOVER TO A MIX OF RAIN OR SNOW SHOWERS OVER SOUTHERN AREAS IS POSSIBLE BEFORE THE PRECIPITATION ENDS AS LOW AND MID LEVEL TEMPERATURES MAY WARM ABOVE CRITICAL LEVELS. BY LATE WEDNESDAY MORNING A COLD FRONT MOVES ACROSS THE AREA AND THEN OFFSHORE WITH CLEARING BEHIND THE FRONT. HIGH PRESSURE BUILDS INTO THE REGION FOR THURSDAY AND FRIDAY WITH FAIR CONDITIONS. TEMPERATURES WILL GENERALLY REMAIN BELOW NORMAL FOR THE WEEK. USED A BLEND OF THE MODELS FOR TEMPERATURES AND POPS. && .AVIATION /19Z SATURDAY THROUGH THURSDAY/... SHORT TERM...VFR CONDITIONS DETEORATING TO MVFR AND IFR SUNDAY NIGHT IN LIGHT SNOW. LONG TERM... MVFR TO IFR CONDITIONS EARLY MONDAY WILL IMPROVE TO VFR BY LATE MORNING MONDAY AND CONTINUE THROUGH TUESDAY. TUESDAY NIGHT MVFR TO IFR CONDITIONS WILL DEVELOP AND CONTINUE INTO WEDNESDAY MORNING. CONDITIONS WILL RETURN TO VFR BY WEDNESDAY AFTERNOON AND CONTINUE THROUGH FRIDAY. && .MARINE... SHORT TERM...NO FLAGS. WINDS BELOW SCA THRESHOLDS AS WELL AS SEAS IN THE SHORT TERM PORTION OF THE FORECAST. LONG TERM...EXPECT TO NEED A STRONG SCA MONDAY AFT INTO MON NIGHT IN AN INCREASING WEST FLOW...WINDS DIMINISH LATE MON NIGHT. SCA MAY BE NEEDED AGAIN IN A SOUTH TO SOUTHWEST FLOW LATE TUE NIGHT AND WEDNESDAY. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...NONE. NH...NONE. MARINE...NONE. && $$

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