Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 200647 AFDGYX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAY ME 247 AM EDT MON MAY 20 2013 .SYNOPSIS...
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A WARM FRONT WILL MOVE NORTH ACROSS THE REGION THIS MORNING PRECEDED BY AN AREA OF SHOWERS. THE FRONT WILL RETURN SOUTHWARD AS A COLD FRONT LATER TODAY PRODUCING SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS. THE FRONT WILL STALL JUST TO THE SOUTH OF THE AREA TONIGHT. PRECIPITATION REMAINS IN THE FORECAST FOR MUCH OF THE WEEK AS THE FRONT REMAINS IN THE AREA.
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&& .NEAR TERM /THROUGH TODAY/...
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AT 06Z...A WARM FRONT EXTENDED FROM QUEBEC SOUTHEAST THROUGH WESTERN NEW ENGLAND. AN AREA OF SHOWERS WAS SITUATED ALONG AND TO THE NORTHEAST OF THE BOUNDARY ACROSS THE FORECAST AREA PER LATEST NWS 88D DOPPLER RADAR MOSAIC. THE STEADIER PRECIPITATION WILL EXIT THIS MORNING AS THE BOUNDARY CONTINUES TO PRESS NORTH AND EAST ACROSS THE FORECAST AREA. WE`LL BRIEFLY SEE THE WARM SECTOR ACROSS MUCH OF THE AREA BEFORE THE FRONT DROPS BACK SOUTH LATE TODAY. DAYTIME HEATING AND FRONTAL BOUNDARY WILL TRIGGER A FEW SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS LATER TODAY. A STRONG SOUTHWEST-TO-NORTHEAST TEMPERATURE GRADIENT TODAY ACROSS THE AREA WITH HIGHS RANGING FROM NEAR 80F SOUTHERN INTERIOR TO THE 60S OVER NORTHERN AND EASTERN SECTIONS.
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&& .SHORT TERM /TONIGHT THROUGH 6 PM TUESDAY/...
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THE FRONT STALLS BRIEFLY TO OUR SOUTH TONIGHT WITH PARTLY CLOUDY SKIES AND PATCHY FOG DEVELOPING. AFTER MIDNIGHT THE FRONT BEGINS TO RETURN NORTH WITH THICKENING CLOUDS AND AN INCREASING CHANCE FOR SHOWERS. THE FRONT WILL CONTINUE TO PRESS SLOWLY NORTH ON TUESDAY WITH SHOWERS EXPANDING IN COVERAGE ACROSS THE REGION. CLOUDS AND PRECIPITATION WILL LIMIT HIGHS TO THE UPPER 50S AND 60S...WITH COOLEST READINGS VICINITY OF COAST IN ONSHORE FLOW.
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&& .LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/...
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BOUNDARY REMAINS PARKED OVER THE AREA THROUGH THE WEEK CREATING A FOCUS FOR RAINY AND CLOUDY CONDITIONS. THE FRONT WILL LIFT NORTH WEDNESDAY AS A WARM FRONT ONLY TO SHIFT SOUTH THURSDAY AS A COLD FRONT WHEN AN UPPER LEVEL TROUGH APPROACHES. ONSHORE FLOW WILL ALSO MEAN AREAS OF DRIZZLE AND FOG WEDNESDAY AND THURSDAY. DIFFERENCES IN TIMING OF THE INDIVIDUAL SHORT WAVES AFFECT THE MOVEMENT OF THE FRONT ON FRIDAY AND THE DISTRIBUTION OF RAINFALL...WITH THE GFS MORE PROGRESSIVE THAN THE EUROPEAN MODEL. REGARDLESS THERE IS A MODERATELY HIGH CHANCE FOR RAIN AREAWIDE. HIGH PRESSURE SHOULD BUILD IN FOR THE WEEKEND GIVING NEW ENGLAND A RESPITE FROM PRECIPITATION...HOWEVER CYCLONIC FLOW ALOFT REMAINS IN PLACE ENSURING CLOUDY SKIES AND POSSIBLY RAIN FOR THE MOUNTAINS. WEDNESDAY AND THURSDAY LOOK WARMER THAN THE REST OF THE WEEK...HOWEVER AREAS IMPACTED WITH ONSHORE FLOW WILL BE COOLER THAN AREAS TO THE WEST.
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&& .AVIATION /06Z MONDAY THROUGH FRIDAY/...
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SHORT TERM /THROUGH TUESDAY/...MVFR TO IFR CONDS WILL SPREAD FROM S-N TONIGHT IN DEVELOPING SHOWERS AND PATCHY FOG IN ADVANCE OF AN APPROACHING WARM FRONT. THESE CONDITIONS WILL CONTINUE INTO TUES MORNING BEFORE IMPROVING BY AFTERNOON TO VFR CONDS AS THE WARM FRONT EXITS TO THE EAST. SCT MVFR PSBL IN SHOWERS AND ISOLATED THUNDERSTORMS. LOW LEVEL MOISTURE WILL LINGER TONIGHT SO PATCHY FOG EXPECTED TO REDEVELOP POSSIBLY LOWERING CONDS TO IFR. MVFR TUESDAY IN SHOWERS WITH LCL IFR PSBL IN DRIZZLE AND FOG. LONG TERM...SCATTERED PERIODS OF MVFR LIKELY ALL WEEK IN SHOWERS AND FOG. COASTAL TERMINALS MAY BE LOWER AT TIMES. SCATTERED THUNDER IS POSSIBLE WEDNESDAY AND THURSDAY.
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&& .MARINE...
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SHORT TERM /THROUGH TUESDAY/...MARGINAL SCA CONDITIONS EXPECTED LATER THIS MORNING INTO EARLY AFTERNOON IN SOUTHEAST ONSHORE FLOW AHEAD OF WARM FRONT. OTHERWISE QUIET ON THE WATERS LATE TODAY INTO TUESDAY. LONG TERM...SCA CONDITIONS EXPECTED WEDNESDAY NIGHT THROUGH THURSDAY NIGHT AS LOW PRESSURE PASSES NEAR THE WATERS. FOG AND DRIZZLE WILL MAKE VISIBILITIES DROP AND BOATING DIFFICULT... ESPECIALLY WEDNESDAY AND THURSDAY.
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&& .FIRE WEATHER...
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WITH DAMP WEATHER EXPECTED FOR MUCH OF THE WEEK ALONG WITH HIGHER RELATIVE HUMIDITY VALUES AND GREEN UP...FIRE WEATHER DANGER SHOULD BE LOW THROUGH THE WEEK.
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&& .GYX WATCHES/WARNINGS/ADVISORIES...
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ME...NONE. NH...NONE. MARINE...SMALL CRAFT ADVISORY UNTIL 3 PM EDT THIS AFTERNOON FOR ANZ150- 152-154.
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&& $$ ES/HANES

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