Area Forecast Discussion
Issued by NWS Portland, ME

Current Version | Previous Version | Text Only | Print | Product List | Glossary Off
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 271321 AFDGYX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAY ME 921 AM EDT FRI MAR 27 2015 .SYNOPSIS... LOW PRESSURE WILL EXIT INTO THE MARITIMES THIS MORNING. A COLD FRONT WILL DROP SOUTH ACROSS THE AREA TODAY. THE INTERACTION BETWEEN A WEAK SURFACE TROUGH...AND LOW PRESSURE PASSING OFFSHORE...WILL PRODUCE CLOUDS AND A FEW SNOW SHOWERS ACROSS THE AREA TONIGHT INTO SATURDAY. SHOWERS WIND DOWN SUNDAY AS HIGH PRESSURE BUILDS IN FROM THE WEST. ANOTHER COLD FRONT CROSSES THE AREA MONDAY...KEEPING THE REGION COOL AND UNSETTLED. && .NEAR TERM /UNTIL 6 PM THIS EVENING/...
-- Changed Discussion --
915 AM UPDATE: INCREASED POPS OVER SOUTHERN AREAS OF MAINE AND SOUTHEAST NH TO CATEGORICAL FOR THE REST OF THE MORNING INTO EARLY AFTERNOON. ALSO WITH COLD POOL AND UPPER TROUGH SITTING OVER US ALOFT KEPT GENERALLY A CHANCE OF RN/SNW SHWRS ELSWHERE THE REST OF THE DAY AND INTO THIS EVENING. 600 AM...MINOR ESTF UPDATE TO INGEST CURRENT MESONET INTO 1ST PERIOD GRIDS. PREV DISC... AT 06Z...A FRONTAL BOUNDARY STRETCHED FROM CAPE COD TO THE SOUTHERN TIP OF NOVA SCOTIA. A SERIES OF WEAK WAVES WERE SLIDING NORTHEAST ALONG THIS BOUNDARY. NWS DOPPLER RADAR CONTINUED TO SHOW LIGHT PRECIPITATION RIDING NORTHEAST ALONG THE BOUNDARY. THE BACK EDGE OF THE PRECIPITATION SHIELD CONTINUED TO PRESS EAST AND SHOULD SLIDE OFFSHORE THIS MORNING. A COLD FRONT WAS DRAPED ACROSS THE SAINT LAWRENCE VALLEY AND COULD TOUCH OFF A FEW MOUNTAIN SNOW SHOWERS BEFORE WASHING OUT LATER TODAY. HIGHS WILL RANGE FROM MID 30S IN THE MOUNTAINS TO LOWER AND MID 40S ELSEWHERE.
-- End Changed Discussion --
&& .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SATURDAY/... ANOTHER LOW WILL RIDE NORTHEAST ALONG THE OFFSHORE BOUNDARY TONIGHT INTO THE DAY ON SATURDAY. COUPLED WITH THE APPROACHING UPPER TROUGH...MODELS DEVELOP AN INVERTED SURFACE TROUGH ACROSS THE REGION TONIGHT INTO THE DAY ON SATURDAY. THE RESULT WILL BE PLENTY OF CLOUDS AND THE POTENTIAL FOR SOME LIGHT SNOW ACCUMULATIONS. HOWEVER...THIS BY NO MEANS LOOKS TO BE A POTENT TROUGH AND WITH BORDERLINE TEMPERATURES AND ONLY LIGHT QPF EXPECTED...IT`LL BE A MARGINAL LATE SEASON EVENT AT BEST. LOWS TONIGHT WILL RANGE FROM TEENS IN THE MOUNTAINS TO NEAR 30 IN SOUTHEAST NEW HAMPSHIRE AND SOUTHWEST COASTAL MAINE. HIGHS SATURDAY WILL BE A FEW DEGREES EITHER SIDE OF 30. && .LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/... OVERALL PATTERN FOR THE EXTENDED WILL FEATURE BROAD TROF OVER THE ERN CONUS. THIS MEANS THAT NEAR TO BELOW NORMAL TEMPS WILL CONTINUE FOR THE FORESEEABLE FUTURE. ECMWF EPS AND GEFS BOTH AGREE THAT THE NRN STREAM WILL REMAIN QUITE ACTIVE THRU THIS TROF. THIS MEANS THAT THRU THE FIRST WEEK OF APRIL WE COULD SEE AS MANY AS 3 OR 4 UPPER LEVEL WAVES MOVE THRU THE REGION. EXACT TIMING IS LOW CONFIDENCE...ALONG WITH EVOLUTION AS SYSTEMS LIKE THIS CAN OFTEN REDEVELOP QUICKLY UPON EXITING THE COAST. WILL HAVE TO WATCH SUN CLOSELY...AS UPPER LEVEL TROF SWINGING OVERHEAD WILL TEND TO KEEP AN INVERTED SURFACE TROF HANGING NEARBY AND EXTENDING PCPN. THE MOST LIKELY LOCATION IS LOW CONFIDENCE...BUT DID DRAG OUT TIMING OF POP A LITTLE LONGER INTO SUN FOR SRN ZONES. HIGHER CONFIDENCE EXISTS ON MON HOWEVER...WHEN A COLD FRONT IS FORECAST TO CROSS THE REGION. THIS FRONT WILL BE MOISTURE STARVED FOR THE MOST PART...WITH MAINLY SCATTERED SHWRS...LINGERING LONGEST IN THE NW UPSLOPE ZONES OF THE MTNS. BEYOND THAT THE GENERAL WINDOWS FOR THE NEXT SYSTEMS APPEAR TO BE MIDWEEK...LATE WEEK...AND LATE NEXT WEEKEND. AGAIN CONSIDERING THE BACKGROUND COOLER THAN NORMAL STATE TO TEMPS...ANY OR ALL OF THESE SYSTEMS COULD FEATURE AT LEAST SOME SNWFL. && .AVIATION /13Z FRIDAY THROUGH TUESDAY/... SHORT TERM...BECOMING VFR THROUGHOUT THIS MORNING. AREAS OF MVFR PSBL TONIGHT AND SAT AM VCNTY OF THE COAST IN SNOW SHOWERS. LONG TERM...GENERALLY VFR CONDITIONS EXPECTED SUN AS HIGH PRES BUILDS IN. A COLD FRONT WILL CROSS THE AREA MON...WITH SCATTERED MVFR CONDITIONS IN RA OR SN SHWRS. && .MARINE... SHORT TERM... WILL CONTINUE WITH SCA FOR SEAS TODAY. AN SCA FOR WIND AND SEAS MAY BE NEEDED LATE TONIGHT AND SATURDAY AS THE NEXT LOW TRACKS BY OFFSHORE. LONG TERM...WINDS AND SEAS LOOK TO INCREASE ABOVE SCA THRESHOLDS AGAIN MON AHEAD OF NEXT COLD FRONT. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...NONE. NH...NONE. MARINE...SMALL CRAFT ADVISORY FOR HAZARDOUS SEAS UNTIL 6 PM EDT THIS EVENING FOR ANZ150-152-154. && $$

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