Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 291827 AFDGYX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAY ME 227 PM EDT SUN MAR 29 2015 .SYNOPSIS... HIGH PRESSURE WILL SHIFT OFFSHORE OVERNIGHT AS A COLD FRONT APPROACHES FROM THE WEST. THE COLD FRONT WILL GRADUALLY CROSS THE REGION ON MONDAY. HIGH PRESSURE WILL BUILD IN FROM THE WEST TUESDAY THROUGH WEDNESDAY. HIGH PRESSURE WILL SHIFT OFFSHORE ON THURSDAY AS A WARM FRONT APPROACHES FROM THE SOUTHWEST. A COLD FRONT WILL PUSH EAST THROUGH THE REGION THURSDAY NIGHT. HIGH PRESSURE WILL BUILD IN FROM THE WEST FRIDAY THROUGH SATURDAY. && .NEAR TERM /THROUGH TONIGHT/... HIGH PRESSURE WILL CREST OVER THE REGION THIS AFTERNOON BEFORE SHIFTING OFFSHORE TONIGHT. A COLD FRONT APPROACHING FROM THE WEST WILL BRING INCREASING CLOUDS OVERNIGHT AND THE CHANCE OF A SNOW SHOWER IN NORTHERN AND WESTERN ZONES TOWARD DAYBREAK MONDAY. EXPECT ANY PRECIP TO BE LIGHT AND SPOTTY. LOWS WILL RANGE THROUGH THE TEENS NORTH AND LOWER TO MID 20S SOUTH. && .SHORT TERM /MONDAY THROUGH MONDAY NIGHT/... COLD FRONT WILL GRADUALLY PUSH EAST THROUGH THE REGION ON MONDAY. THE DAY WILL FEATURE MOSTLY CLOUDY SKIES WITH SNOW SHOWERS IN THE NORTH AND RAIN OR SNOW SHOWERS IN SOUTHERN AND COASTAL ZONES. EXPECT LITTLE IF ANY SNOW ACCUMULATION IN SOUTHERN AREAS BUT AN INCH OR TWO WILL BE POSSIBLE IN THE NORTH. HIGHS WILL RANGE FROM THE UPPER 30S TO THE MID 40S. COLD FRONT WILL SHIFT OFFSHORE BY MONDAY EVENING. WILL SEE A CONTINUING CHANCE OF SNOW SHOWERS IN THE NORTH AS UPSLOPE WINDS KICK IN. ELSEWHERE LOOKING FOR PARTIAL CLEARING AND JUST A CHANCE OF AN EVENING SNOW SHOWER. LOW TEMPS WILL RANGE THROUGH THE 20S TO NEAR 30. && .LONG TERM /TUESDAY THROUGH SUNDAY/... AFTER A LONG WINTER OF COLD AIR ITS NICE TO SEE THE CORE OF THE HEMISPHERIC COLD AIR HAS RETREATED TO BAFFIN ISLAND. THIS LEAVES THE OVERALL PATTERN AS FAIRLY ZONAL THROUGH NORTH AMERICA... ALTHOUGH WE STILL HANG ONTO A BIT OF OUR EAST COAST TROUGH. A SERIES OF DISTURBANCES WILL MOVE THROUGH THIS FLOW OVER THE NEXT WEEK AS THE GENERALLY PROGRESSIVE PATTERN CONTINUES. AFTER A COLD FRONT MOVES THROUGH MONDAY NIGHT, TUESDAY WILL SEE US RETURN TO OUR FAVORITE POST-FRONTAL PATTERN WITH UPSLOPE SNOW SHOWERS IN THE MOUNTAINS.. COLD AIR ADVECTION AND NORTHWESTERLY WINDS. THE APRIL SUN WILL MAKE THIS DAY CONSIDERABLY MILDER THAN THE PATTERN WOULD SUGGEST BUT NEVERTHE LESS TEMPERATURES WILL REMAIN BELOW NORMAL WITH HIGHS AROUND 40 AT THE SEACOAST AND 30S INLAND. WINDS MAY GUST TO 25 TO 30 MPH IN THE MORNING... BUT THE GENERALLY WEAKER PRESSURE GRADIENT WILL MEAN WINDS WILL DECREASE QUICKLY THROUGH THE AFTERNOON. WEDNESDAY A WEAK SYSTEM WILL PASS TO OUR SOUTH... BRINING SOME CLOUDS TO SOUTHERN NEW HAMPSHIRE AND YORK COUNTY MAINE. FROM THERE WE TRY TO BRING IN SOME WEAK RIDGING OVERNIGHT INTO THURSDAY. AS THE SURFACE RIDGE CRESTS TO THE SOUTH ON THURSDAY SOUTHERLY FLOW WILL BRING US SOME WARM AIR WITH TEMPERATURES REACHING THE 50S SOUTH TO 40S NORTH UNDER MOSTLY SUNNY SKIES. ANOTHER SYSTEM WILL MOVE OUT OF THE CANADIAN PRAIRIES FOR LATE THURSDAY INTO FRIDAY. STILL QUITE A BIT OF SPREAD ON THE TIMING...WITH SHOWERS ARRIVING AS EARLY AS THURSDAY NIGHT OR AS LATE AS FRIDAY AFTERNOON. WHAT IS CLEAR IS THAT FRIDAY IS LIKELY TO BE A WET DAY AS A LOW TRACKS TO THE NORTH AND DRAGS ANOTHER COLD FRONT THROUGH THE REGION. && .AVIATION /18Z SUNDAY THROUGH FRIDAY/... SHORT TERM...VFR TONIGHT. AREAS OF MVFR VSBY/CIGS ON MONDAY....IMPROVING TO VFR MONDAY NIGHT. LONG TERM... VFR CONDITIONS THROUGH THE FIRST PART OF THE WEEK DECREASING TO MVFR SHOWERS ON THURSDAY. && .MARINE... SHORT TERM...SCA`S WILL BE NEEDED AFTER MIDNIGHT TONIGHT AND WILL GO THROUGH MONDAY NIGHT. LONG TERM...WINDS WILL DECREASE TUESDAY MORNING BEHIND THE FRONT AND WILL REMAIN BELOW SCA THROUGH THE END OF THE WEEK. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...NONE. NH...NONE. MARINE...SMALL CRAFT ADVISORY FOR AN150>AN154 FROM 4 AM MONDAY THROUGH MONDAY NIGHT. && $$

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