Area Forecast Discussion
Issued by NWS Portland, ME

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000 FXUS61 KGYX 221546 AFDGYX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE GRAY ME 1148 AM EDT MON SEP 22 2014 .SYNOPSIS... A COLD FRONT WILL EXIT THE COAST THIS MORNING. AN UPPER TROUGH WILL PROVIDE SOME LINGERING CLOUDS TODAY AS WELL AS SCATTERED SHOWERS ACROSS THE HIGHER TERRAIN. HIGH PRESSURE WILL BRING A SHOT OF COOLER AIR FOR TUESDAY AND WEDNESDAY. THIS RIDGE OF HIGH PRESSURE WILL CONTINUE TO BUILD OVER THE REGION LATE IN THE WEEK AND THROUGH THE WEEKEND WITH A A SIGNIFICANT WARMING TREND EXPECTED. && .NEAR TERM /UNTIL 6 PM THIS EVENING/...
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1145 AM UPDATE...A FEW MINOR CHANGES TO THE GOING FORECAST BASED ON LATEST TRENDS IN OBSERVATIONAL DATA. COLD FRONT IS CURRENTLY IN THE PROCESS OF SWEEPING OFFSHORE. GUSTY NWLY WINDS WILL FOLLOW IN ITS WAKE. 9 AM UPDATE...HAVE UPDATED THE FORECAST A LITTLE BIT TO TAKE INTO ACCOUNT LATEST TRENDS IN OBSERVATIONAL DATA. COLD FRONT NOW PUSHING ACROSS MAINE WITH A LINE OF SHOWERS. AFTER FROPA...WE EXPECT SUNNY SKIES EXCEPT IN THE MOUNTAINS WHERE MOIST UPSLOPE WILL KEEP THINGS CLOUDY. 550 AM...I DROPPED THE DENSE FOG ADVISORY FOR THE AREA AS VISIBILITIES CONTINUE TO IMPROVE. OTHERWISE...1ST PERIOD GRIDS WERE ADJUSTED BASED ON MESONET AND RADAR TRENDS. PREV DISC... AT 06Z...A 997 MILLIBAR LOW WAS CENTERED OVER SOUTHEAST QUEBEC WITH A TRAILING COLD FRONT THROUGH WESTERN NEW ENGLAND AND A SECONDARY FRONT THROUGH EASTERN NEW YORK STATE. NATIONAL WEATHER SERVICE DOPPLER RADAR MOSAIC SHOWED A BAND OF SHOWERS ALONG AND AHEAD OF THE FRONTAL BOUNDARY ACROSS THE FORECAST AREA. THE FRONT AND SHOWERS SHOULD CLEAR THE COAST THIS MORNING WITH GUSTY WESTERLY FLOW IN ITS WAKE. INSTABILITY WITH UPPER TROUGH SHOULD PROVIDE A GOOD DEAL OF CLOUDS TODAY WITH ANY SHOWERS CONFINED TO THE HIGHER TERRAIN. COOLING COLUMN SPELLS A RAIN/SNOW MIX OR WET SNOW FOR THE HIGHEST TERRAIN STARTING LATE TODAY. HIGHS RANGE FROM NEAR 60 IN THE MOUNTAIN VALLEYS TO AROUND 70F AT THE COAST.
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&& .SHORT TERM /6 PM THIS EVENING THROUGH 6 PM TUESDAY/... HIGH PRESSURE CONTINUES TO SLOWLY BUILD EAST TONIGHT WITH THE LIGHT DOWNSLOPING WINDS CONTINUING...SO CLOUDS WILL LINGER IN THE MOUNTAINS BUT SKIES SHOULD BECOME MOSTLY CLEAR ELSEWHERE. MUCH COOLER TONIGHT WITH LOWS IN THE 30S ACROSS THE MOUNTAINS AND IN THE 40S ELSEWHERE. ON TUESDAY...A WEAK FRONT AND REINFORCING SHOT OF COOL AIR SPELLS A FEW CLOUDS MAINLY ACROSS THE HIGH TERRAIN ALONG WITH WIDELY SCATTERED SHOWERS. HIGHS WILL BE MAINLY IN THE 60S...WITH A FEW 50S ACROSS MOUNTAIN SECTIONS. && .LONG TERM /TUESDAY NIGHT THROUGH SUNDAY/... HIGH PRESSURE WILL REMAIN ANCHORED OVER NEW ENGLAND THROUGH THE PERIOD AND FULLY UNDER CONTROL OF OUR WEATHER. THIS WILL ALLOW FOR A PROLONGED PERIOD OF DRY...SUNNY CONDITIONS DURING THE DAY AND CLEAR SKIES DURING THE NIGHTTIME PERIODS. LATE NIGHT FOG WILL BE LIKELY OVER THE INTERIOR VALLEYS EACH NIGHT...ESPECIALLY OVER THE CT RIVER VALLEY. THERE WILL ALSO BE A MODERATION TREND WITH TEMPERATURES HEADING INTO THIS UPCOMING WEEKEND. EXPECT WIDESPREAD 70S DURING THE DAY BY THE END OF THE WORKWEEK. && .AVIATION /10Z MONDAY THROUGH FRIDAY/... VFR THROUGHOUT. WEST WINDS WILL GUST BTWN 20 AND 25 KT DURING THE DAYLIGHT HOURS TODAY. LCL IFR IS POSSIBLE TOWARDS DAWN TUESDAY IN VALLEY STRATUS AND FOG. LONG TERM...HIGH PRESSURE WILL REMAIN ANCHORED OVER THE REGION DURING THE LONG TERM. THIS WILL ALLOW FOR MOSTLY VFR CONDITIONS...HOWEVER PATCHY DENSE LATE NIGHT FOG MAY ALLOW FOR ISOLD LIFR CONDITIONS ACROSS SOME OF THE INTERIOR VALLEYS. && .MARINE... SHORT TERM...SCA FOR HAZARDOUS SEAS CONVERTED TO AN SCA AS WE SEE MARGINAL GUSTS TO NR 25 KT AS WELL AS SEAS NR 5 FT INTO TONIGHT. LONG TERM...WINDS AND SEAS WILL REMAIN BELOW SCA LEVELS. && .GYX WATCHES/WARNINGS/ADVISORIES... ME...NONE. NH...NONE. MARINE...SMALL CRAFT ADVISORY UNTIL 6 AM EDT TUESDAY FOR ANZ150>154. && $$ ES

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