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Area Forecast Discussion
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000
FXUS61 KGYX 300140
AFDGYX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE GRAY ME
940 PM EDT WED OCT 29 2014

.SYNOPSIS...
A COLD FRONT WILL CROSS THE REGION BY THIS EVENING. COOLER HIGH
PRESSURE WILL BUILD IN BEHIND THE FRONT THURSDAY AND FRIDAY.
POWERFUL LOW PRESSURE WILL BEGIN TO IMPACT THE REGION OVER THE
WEEKEND...BRINGING EVEN COLDER AIR THE CHANCE OF SOME RAIN AND
SNOW. WHILE AT THIS TIME IT LOOKS TO PASS MOSTLY OUT TO SEA...SOME
MINOR ACCUMULATIONS OF SNOW ARE POSSIBLE. HIGH PRESSURE BUILDS IN
FOR EARLY NEXT WEEK.

&&

.NEAR TERM /THROUGH TONIGHT/...
940 PM UPDATE...BAND OF LIGHT SHOWERS IS CURRENTLY MOVING OFFSHORE.
HAVE SPED UP THE CLEARING LINE WHICH IS REACHING THE CT VALLEY AT THIS
TIME. OTHERWISE...NO SIGNIFICANT CHANGES.

630 PM UPDATE...HAVE UPDATED THE FORECAST A BIT THIS EVENING MAINLY 
TO ACCOUNT FOR THE TIMING OF THE BAND OF RAIN MOVING ACROSS THE CWA. 
THE HRRR HAS A GOOD HANDLE ON IT AND HAVE USED IT/S TIMING. THE BAND 
SHOULD SPEED UP A BIT AND EXIT THE COAST PRIOR TO MIDNIGHT. OTHERWISE...NO 
SIGNIFICANT CHANGES.

PREVIOUSLY...

SFC COLD FRONT CURRENTLY LOOKS TO STRETCH SW ALONG THE ST LAWRENCE
VLY AND THEN INTO CENTRAL NY. SHOULD BEGIN TO TRACK MORE QUICKLY
TO THE E OVER THE NEXT FEW HOURS...AND THE BAND OF SHOWERS WILL
SHIFT EWD ACROSS THE CWA THRU LATE THIS AFT AND DURING EARLY
EVENING. THE SHRA SHOULD CLEAR ALL BUT THE MID-COAST BY7 AROUND
00Z...AND SHOULD EXIT THERE BY 02Z.  

WESTERLY FLOW BEHIND THE FRONT SHOULD CLEAR OUT ANY LOW CLOUDS AND
FOG LINGERING ALONG THE COAST...AND SKIES SHOULD AT LEAST
PARTIALLY CLEAR OUT IN THE DOWNSLOPE AREAS....WITH CLOUDS LINGERING
IN THE MTNS. LOWS WILL GENERALLY BE IN THE UPPER 30S TO MID 40S.

&&

.SHORT TERM /THURSDAY THROUGH THURSDAY NIGHT/...
AFTER A WEAK 500MB RIDGE PASSE4S THRU THE CWA EARLY AM...WHICH
COULD PRODUCE A CLUSTER OF MID-HIGH EARLY...SHOULD SEE SFC HIGH
BUILD IN FROM THE W AS WEAK RIDGING DEVELOPS ALOFT. WILL SEE
UPSLOPE CLOUDS AND DOWNSLOPE CLEARING DURING THE DAY....WITH HIGHS
IN THE UPPER 40S TO MID 50S. WINDS DROP OFF FOR A MAINLY CLEAR AND
CALM THU NIGHT...SO TEMPS WILL GENERALLY FALL INTO THE 30S.


&&

.LONG TERM /FRIDAY THROUGH TUESDAY/...
MAIN FOCUS OF THE EXTENDED REVOLVES AROUND POWERFUL LOW PRES
SYSTEM THAT WILL DEVELOP OVER THE WEEKEND.

A POTENT S/WV WILL CARVE OUT A SEASONABLY STRONG TROF OVER THE ERN
CONUS. ALL MODEL GUIDANCE IS CONSISTENT WITH DIGGING A -3 TO -5 SD
CLOSED LOW THRU THE CAROLINAS SAT. THIS EXITS THE COAST AND FUELS
A POWERFUL LOW PRES OVER THE WATERS THAT RACES NEWD. THE FLY IN
THE OINTMENT IS A LEAD S/WV THAT IS FORECAST TO TRIGGER
CYCLOGENESIS OFF THE COAST PRIOR TO THE MAIN UPPER TROF ARRIVING
OVER EAST COAST. THE RESULT IS A PUSH EWD OF THE BAROCLINIC
ZONE...WHICH KEEPS THE SECOND SFC LOW FARTHER OUT TO SEA FOR THE
SECOND HALF OF THE WEEKEND. GIVEN THE CLOSED NATURE OF THE UPPER
LEVELS THIS SFC LOW WILL TRY AND TUCK BACK TOWARDS THE COAST WITH
TIME...SO COASTAL ME IS NOT LEFT HIGH AND DRY. INCREASING
LONGITUDE WILL MEAN INCREASING UNCERTAINTY REGARDING QPF IN THIS
SET UP. PARTS OF NH COULD SEE VERY LITTLE IN THE WAY OF
PCPN...WHILE THE PENOBSCOT BAY REGION SEES CLOSE TO AN INCH OF
LIQUID EQUIVALENT.

ATTM A MULTI MODEL BLEND SEEMS PRUDENT...THOUGH THE INDIVIDUAL
PIECES OF GUIDANCE ARE FAIRLY SIMILAR WITH A NEAR MISS. THE
RESULTING QPF FORECAST IS AROUND 0.10 INCHES FOR THE CT RIVER
VALLEY...INCREASING TO NEAR A HALF INCH AROUND KPWM TO
JACKMAN...AND FINALLY 0.75 INCHES NEAR KRKD. EXAMINING TEMP
PROFILES OF THE VARIOUS MODELS DOES GIVE SUPPORT TO A WIDESPREAD
CHUNK OF THE FORECAST AREA SEEING THE FIRST ACCUMULATING SNFL OF
THE SEASON. THE RAPIDLY DEEPENING LOW PRES AND LEAD S/WV HEADING
OUT TO SEA WILL HELP TO MITIGATE WAA BRINGING IN ABOVE FREEZING
AIR ALOFT. MODEL FORECASTS DO WARM SOME ALOFT...BUT AS 925 MB
TEMPS FALL TO NEAR -4 C ALONG THE COAST...THAT SHOULD STAY ALL OR
MOSTLY SNOW...ESPECIALLY HEADING INTO SAT NIGHT AND SUN. BASED ON
THAT FORECAST ALOFT AND EXPECTED HOURLY TEMPS...THE GRIDS REFLECT
3-5 INCHES OF SNFL POSSIBLE FOR CENTRAL ME AND ESPECIALLY THE
MIDCOAST. CLOSER TO KPWM LESS THAN AN INCH IS POSSIBLE...WITH A
DUSTING TO JUST A FEW FLAKES ELSEWHERE. 

ALSO OF NOTE ARE THE WIND PROFILES FROM THE VARIOUS FORECAST
MODELS. ATTM THE GFS AND CMC ARE THE MOST BULLISH GUIDANCE. BASED
ON THE WIND ALOFT AND FORECAST MIXED LAYER...GUSTS GREATER THAN 40
KTS WOULD BE POSSIBLE. OVER THE OUTER WATERS EVEN STRONGER GUSTS
IN THE 50-60 KT RANGE WOULD BE POSSIBLE. THE ECMWF IS TEMPERED
SLIGHTLY...WITH OVERLAND GUSTS MORE IN THE 35-40 KT RANGE. GIVEN
THE DIFFICULTY IN REACHING HIGH WIND WARNING CRITERIA IN MOST
EVENTS THE ECMWF WAS WEIGHTED SLIGHTLY HIGHER IN THE BLEND. EVEN
SO THE FORECAST REFLECTS 35-45 MPH GUSTS ALONG THE COAST...WITH
NEAR STORM FORCE OVER THE WATERS. 

THE MAIN POINT IS THAT THERE IS POTENTIAL FOR A SIGNIFICANT SYSTEM
TO AFFECT AT LEAST PART OF THE FORECAST AREA THIS WEEKEND.
HOWEVER...THERE IS STILL ROOM FOR THE FORECAST TO CHANGE IN EITHER
DIRECTION...INCLUDING FARTHER OUT TO SEA AND LESS PCPN.

BEYOND THE WEEKEND...A MULTI-MODEL CONSENSUS WAS THE PREFERRED
FORECAST METHOD. HIGH PRES AND RIDING ALOFT GENERALLY IN CONTROL
THRU MIDWEEK. TEMPS SHOULD REBOUND NICELY FROM THE COLDER THAN
NORMAL WEEKEND. THE NEXT CHANCE FOR PCPN WILL BE THE SECOND HALF
OF THE WORK WEEK.

&&

.AVIATION /19Z WEDNESDAY THROUGH MONDAY/...
SHORT TERM...STUBBORN LOW CLOUDS AND FOG SHOULD BEGIN TO CLEAR OUT
ONCE A COLD FRONT PASSES THRU AROUND 00Z. COULD SEE SOME FOG
ADVECT IN FROM THE RIVER AT KLEB. VFR THEN EXPECTED THROUGH THU
NIGHT. 

LONG TERM...VFR CONDITIONS START THE PERIOD FRI. LOW PRES GATHERS
STRENGTH S OF THE AREA ON SAT...WITH CLOUDS SPREADING NWD. MVFR
AND EVENTUALLY IFR CIGS/VSBYS MOVE INTO THE AREA. SNFL IS POSSIBLE
FOR MUCH OF THE AREA LATE SAT INTO SUN. ACCUMULATIONS APPEAR
UNLIKELY OUTSIDE OF CENTRAL ME...BUT IFR VSBYS WOULD BE POSSIBLE
IN ANY SNOW. GRADUALLY IMPROVEMENT BACK TO VFR CONDITIONS ARE
EXPECTED LATE SUN THRU THE MIDDLE OF NEXT WEEK.

&&

.MARINE...
SHORT TERM...ALTHOUGH WILL SEE A BRIEF SURGE IN W-NW WINDS
OVERNIGHT BEHIND A COLD FRONT...WINDS/SEAS WILL REMAIN BLO SCA
LVLS THRU THU NIGHT. 

LONG TERM...A DEVELOPING COASTAL STORM IS GOING TO GATHER STRENGTH
INTO THE WEEKEND. ATTM A SEASONABLY STRONG LOW PRES IS FORECAST TO
PASS THRU OR NEAR THE GULF OF ME. THERE REMAINS SOME UNCERTAINTY
ATTM...BUT GALES APPEAR LIKELY WITH STORM FORCE GUSTS POSSIBLE.
SEAS WILL ALSO CLIMB TO NEAR 20 FT IN THIS SCENARIO. WINDS AND
SEAS THEN GRADUALLY DIMINISH INTO EARLY NEXT WEEK AS HIGH PRES
TAKES CONTROL OF THE WATERS.

&&

.GYX WATCHES/WARNINGS/ADVISORIES...
ME...NONE.
NH...NONE.
MARINE...NONE.

&&

$$

NEAR TERM UPDATE...MLE
LONG TERM...LEGRO



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