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 051731 AFDGYX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAY ME 1231 PM EST THU MAR 5 2015 .SYNOPSIS... HIGH PRESSURE WILL GRADUALLY BUILD IN FROM THE WEST THROUGH THURSDAY...AND CREST OVER THE REGION ON FRIDAY. A COLD FRONT WILL APPROACH FROM THE WEST FRIDAY NIGHT AND WILL CROSS THE AREA ON SATURDAY. WEAK LOW PRESSURE WILL MOVE IN FROM THE WEST SATURDAY NIGHT AND WILL PUSH EAST THROUGH THE REGION ON SUNDAY. HIGH PRESSURE WILL BUILD SOUTH OF THE REGION MONDAY AND WILL SHIFT OFFSHORE SOUTH OF NEW ENGLAND ON TUESDAY. && .NEAR TERM /UNTIL 6 PM THIS EVENING/...
-- Changed Discussion --
1230 PM UPDATE...COLD AIR CONTINUES TO PUSH INTO THE AREA. TEMPERATURES WERE RUNNING 1-3 DEGREES BELOW PREVIOUS FORECAST SO LOWERED THE TEMPS BASED ON THESE CURRENT OBS AND TRENDS. 930 AM UPDATE...NO SIGNIFICANT CHANGES MADE TO THE FORECAST. ADJUSTED TEMPERATURES TO MATCH CURRENT OBS AND TRENDS. MODELS SHOW T850 TO CONTINUE TO DROP THROUGH THE DAY WITH COLD AIR ADVECTION AND AREAS ACROSS THE NORTH WILL LIKELY ONLY TOP OUT IN THE UPPER SINGLE DIGITS TO LOW TEENS TODAY EVEN WITH SOME BREAKS OF SUN THIS AFTERNOON. SURFACE HIGH PRESSURE CONTINUES TO PUSH INTO THE REGION...BUT MID TO UPPER LEVEL CLOUDS ASSOCIATED WITH THE FRONT TO OUR SOUTH WILL LIKELY LINGER OVER THE AREA INTO THIS AFTERNOON ACROSS THE NORTH AND INTO THE EVENING HOURS ACROSS THE SOUTH. 600 AM...FOR THIS ESTF UPDATE I MADE MINOR ADJUSTMENTS TO 1ST PERIOD GRIDS TO REFLECT THE LATEST MESONET AND SATELLITE TRENDS. PREV DISC... AT 07Z...A SECONDARY COLD FRONT WAS SITUATED ALONG THE COASTAL PLAIN...WHILE A FRONTAL BOUNDARY EXTENDED FROM THE DELMARVA TO SOUTH OF NEW ENGLAND WITH A SERIES OF WAVES RIDING ALONG IT. THE COLD FRONT WILL EXIT THE COAST NEXT FEW HOURS. CLOUD SHIELD WITH THE BOUNDARY TO OUR SOUTH WILL GRADUALLY SINK FURTHER SOUTHWARD TODAY AS SURFACE HIGH BEGINS TO NOSE IN FROM THE WEST. MUCH COLDER THEN YESTERDAY AS COLD AIR DEEPENS ACROSS THE FORECAST AREA WITH READINGS A GOOD 15 TO 20 DEGREES COOLER THAN WEDNESDAY. OUTSIDE OF A STRAY FLURRY...IT WILL BE A DRY DAY ACROSS OUR FORECAST AREA TODAY.
-- End Changed Discussion --
&& .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM FRIDAY/... CLEARING AND SEASONABLY COLD TONIGHT AS SURFACE HIGH SETTLES ACROSS THE REGION. LOWS WILL RANGE FROM AROUND ZERO NEAR THE COAST TO 15 BELOW IN THE MOUNTAINS. ON FRIDAY...MOSTLY SUNNY AND CONTINUED COLD UNDER THE SURFACE RIDGE WITH HIGH TEMPERATURES RANGING FROM 15 TO 25 DEGREES...OR A GOOD 15 DEGREES BELOW AVERAGE FOR THE DATE. && .LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/... PLENTY OF COLD AIR REMAINS IN PLACE DURING THE END OF THE WORKWEEK ACROSS THE FORECAST AREA...WITH HIGH TEMPERATURES MAINLY BETWEEN 15 AND 25 DEGREES FROM NORTH TO SOUTH. READINGS SHOULD BE AROUND 40 DEGREES FOR HIGHS IN PORTLAND THIS TIME OF THE YEAR. A WEEK FRONT WILL CROSS NEW ENGLAND SATURDAY NIGHT. AHEAD OF THE FRONT...WEAK WARM AIR ADVECTION WILL ALLOW TEMPERATURES TO REACH THE FREEZING LEVEL OVER SOUTHERN SECTIONS. FULL SUNSHINE SHOULD ALLOW READINGS TO REACH THE FREEZING MARK OVER SOUTHERN SECTIONS ON SUNDAY AS WELL. THIS IS STILL WELL BELOW NORMAL. 00Z MODEL SUITE STILL SHOWING A WEAK AREA OF LOW PRESSURE CROSSING OVER MAINE AND NEW HAMPSHIRE EARLY MONDAY MORNING. THIS WILL BRING SOME SNOW SHOWERS OR A BRIEF PERIOD OF LIGHT SNOW TO THE REGION. THIS SYSTEM WILL BE SIMILAR TO THE OTHERS IN THAT IT WILL BE MOISTURE STARVED. LACK OF ARCTIC AIR BEHIND THIS DEPARTING SYSTEM WILL ALLOW FOR A WARM UP EARLY TO MID NEXT WEEK WITH WIDESPREAD 40S. AN OFFSHORE FLOW TUESDAY AND WEDNESDAY WILL BRING THE WARMEST LOCATIONS TO THE COASTLINE. && .AVIATION /18Z THURSDAY THROUGH TUESDAY/... SHORT TERM...VFR EXPECTED. LONG TERM...IFR CONDITIONS ARE POSSIBLE IN DETERIORATING CONDITIONS...LOWERING CEILINGS AND POSSIBLY LOWERING VISIBILITIES IN SOME SNOW SHOWERS EARLY MONDAY. && .MARINE... SHORT TERM...SMALL CRAFT WINDS AND SEAS EXPECTED THROUGH TONIGHT BEHIND THE SECONDARY COLD FRONT WITH CURRENT HEADLINE EXTENDED ACCORDINGLY. COLD TEMPERATURES AND WIND TONIGHT WILL PRODUCE A PERIOD OF MODERATE FREEZING SPRAY WITH A FREEZING SPRAY ADV ISSUED FOR TONIGHT. LONG TERM...QUICK MOVING...BUT RELATIVELY WEAK SYSTEMS WILL CROSS THE WATERS DURING THE NEXT SEVERAL DAYS. THE HIGHEST CHANCE OF REACHING SCA WIND THRESHOLDS OF GUSTS TO 25 KNOTS WILL OCCUR EARLY SUNDAY MORNING...EARLY MONDAY MORNING AND AGAIN WEDNESDAY. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...NONE. NH...NONE. MARINE...SMALL CRAFT ADVISORY UNTIL 7 AM EST FRIDAY FOR ANZ150>154. FREEZING SPRAY ADVISORY FROM 6 PM THIS EVENING TO 7 AM EST FRIDAY FOR ANZ150>154. && $$ NEAR TERM...KISTNER

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