Area Forecast Discussion
Issued by NWS Portland, ME

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000
FXUS61 KGYX 182256
AFDGYX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAY ME
656 PM EDT THU SEP 18 2014

.SYNOPSIS...
HIGH PRESSURE WILL BUILD IN FROM THE WEST TONIGHT THROUGH FRIDAY
AND WILL SHIFT OFFSHORE FRIDAY NIGHT. HIGH PRESSURE WILL REMAIN
OFF THE EAST COAST SATURDAY ALLOWING A WARM FRONT TO TRACK
NORTHEAST ACROSS THE AREA SATURDAY NIGHT. A COLD FRONT WILL
QUICKLY FOLLOW FROM THE WEST SUNDAY NIGHT INTO MONDAY...AND WILL
PROVIDE A ROUND OF SHOWERS. HIGH PRESSURE WILL BUILD IN BEHIND THE
FRONT MONDAY NIGHT THROUGH WEDNESDAY.

&&

.NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...
655 PM: NO CHANGES NEEDED ATTM.

PREV DISC:
STRONG CAA WILL BE WORKING INTO THE REGION THIS EVENING BEHIND A
COLD FRONT. SKIES SHOULD CLEAR AFTER SUNSET AND TEMPERATURES WILL
PLUMMET SHORTLY AFTER...GIVING US OUR COLDEST TEMPERATURES THIS
SEASON AND MOST LIKELY ENDING THE GROWING SEASON FOR ALL OF OUR
NORTHERN FORECAST ZONES. COLDEST TEMPERATURES WILL BE ACROSS THE
NORTH WHERE PRESSURE GRADIENT WILL BE WEAKER. IN THE SOUTH AS THE
HIGH PRESSURE MOVE IN THE GRADIENT WILL TIGHTEN AND THIS WILL KEEP
WINDS UP OVERNIGHT. CURRENT THINKING IS THAT LOW LYING SHELTERED
LOCATIONS ALONG THE COASTAL PLAIN WILL SEE A FROST
TONIGHT...HOWEVER MOST OF THE AREA WILL BE SPARED...SO JUST WENT
WITH FROST ADVISORIES IN THESE AREAS. COASTAL ZONES AND INTERIOR
ROCKINGHAM COUNTY SHOULD ESCAPE SEEING FROST AS WINDS WILL REMAIN
STRONGEST IN THESE LOCATIONS OVERNIGHT.

&&

.SHORT TERM /6 AM FRIDAY MORNING THROUGH FRIDAY NIGHT/...
HIGH PRESSURE WILL BE OVERHEAD TOMORROW AND ALTHOUGH WE WILL HAVE
PLENTY OF SUNSHINE...IT IS STILL GOING TO BE QUITE COOL SINCE MOST
AREAS WILL START OFF IN THE UPPER 20S TO LOW 30S. THE HIGH WILL
SHIFT OFF SHORE ON FRIDAY AFTERNOON AND SOUTHWEST FLOW WILL
DEVELOP. T850 WILL CONTINUE TO WARM THROUGH SATURDAY MORNING AND
WILL BE A SOLID 10C WARMER THAN THEY WERE FRIDAY MORNING. FOG WILL
MOST LIKELY DEVELOP IN THE VALLEYS ON FRIDAY NIGHT UNDER THE CLEAR
AND CALM CONDITIONS.

&&

.LONG TERM /SATURDAY THROUGH THURSDAY/...
HIGH PRES MOVES OFF THE COAST SAT AND SAT NIGHT ALLOWING A RETURN
WARMER SOUTHWEST FLOW TO DEVELOP AHEAD OF AN APPROACHING UPPER
TROF AND ASSOCIATED SURFACE COLD FRONT. SCT SHWRS WILL DEVELOP IN
THE MTNS SUN AFTN AND SPREAD SOUTH OVER THE REST OF THE FA SUNDAY
NIGHT AHEAD AND THEN ALONG THIS COLD FRONT...NOT A LOT OF QPF
WILL BE ASSOCIATED WITH THE FRONT. BEHIND THE FRONT FOR EARLY
NEXT WEEK A RETURN TO COOLER AND MAINLY FAIR WX EXCEPT MAYBE A FEW
SHWRS IN THE MTNS.

BY MIDWEEK AND BEYOND A MAJOR BLOCKING HIGH PATTERN DEVELOPS
ALLOWING THE BEGINNING OF A VERY LONG NICE STRETCH OF DRY WEATHER.

&&

.AVIATION /00Z FRIDAY THROUGH TUESDAY/...
SHORT TERM...MOSTLY VFR CONDITIONS EXPECTED THROUGH THE ENTIRE
PERIOD EXCEPT FOR FOG CONDITIONS IN THE VALLEYS...DROPPING HIE AND
LEB DOWN TO LIFR CONDITIONS IN THE EARLY MORNING HOURS.

LONG TERM...MAINLY VFR THROUGH SUNDAY...ALTHOUGH SOME VLY FOG
POSSIBLE EACH NIGHT. SOME MVFR CONDITIONS POSSIBLE LATE SUN
THROUGH SUN NIGHT IN SCT SHRA AHEAD IN ADVANCE OF A COLD FRONT.

&&

.MARINE...
SHORT TERM...WINDS WILL INCREASE TONIGHT BEHIND THE COLD
FRONT...WITH SCAS EXPECTED FOR ALL THE OUTER WATERS. THINGS WILL
START TO CALM DOWN BY LATE FRIDAY MORNING AND NO FURTHER FLAGS ARE
EXPECTED.

LONG TERM...SW FLOW AHEAD OF COLD FRONT COULD BRING WINDS AND SEAS
TO SCA CRITERIA SAT NIGHT AND SUNDAY.

&&

.GYX WATCHES/WARNINGS/ADVISORIES...
ME...FREEZE WARNING FROM 1 AM TO 8 AM EDT FRIDAY FOR MEZ007>009-
     012>014.
     FROST ADVISORY FROM 1 AM TO 8 AM EDT FRIDAY FOR MEZ018>022.
NH...FREEZE WARNING FROM 1 AM TO 8 AM EDT FRIDAY FOR NHZ001>006.
     FROST ADVISORY FROM 1 AM TO 8 AM EDT FRIDAY FOR NHZ007>010.
MARINE...SMALL CRAFT ADVISORY FROM 10 PM THIS EVENING TO 10 AM EDT
     FRIDAY FOR ANZ150-152-154.

&&

$$



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