Area Forecast Discussion
Issued by NWS Boston, MA

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FXUS61 KBOX 242311
AFDBOX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAUNTON MA
711 PM EDT FRI OCT 24 2014

.SYNOPSIS...
LOW PRESSURE WILL MOVE INTO THE MARITIMES TONIGHT. A WEAK RIDGE
OF HIGH PRESSURE PROVIDES DRY AND SEASONABLY MILD WEATHER
SATURDAY. A COLD FRONT WILL SWEEP ACROSS THE REGION SATURDAY NIGHT
AND MAY BE ACCOMPANIED BY A FEW SHOWERS...THEN DRY AND BLUSTERY
WEATHER FOLLOWS FOR SUNDAY WITH WARMING EARLY NEXT WEEK. A COLD
FRONT MAY BRING SHOWERS TUESDAY NIGHT INTO WEDNESDAY. HIGH
PRESSURE BRIEFLY VISITS ON THURSDAY WITH THE POTENTIAL FOR A LOW
PRESSURE SYSTEM IN OUR VICINITY AT THE END OF THE NEXT WORKWEEK.

&&

.NEAR TERM /UNTIL 6 AM SATURDAY MORNING/...
7 PM UPDATE...
CURRENT FORECAST LOOKS ON TRACK...ONLY MINOR ADJUSTMENTS MADE.
CLOUDY SKIES TO START THIS EVENING BUT GRADUAL CLEARING EXPECTED
FROM WEST TO EAST AS THE NIGHT PROGRESSES.

LATE AFTERNOON DISCUSSION FOLLOWS...
VERTICALLY STACKED LOW MOVES INTO THE MARITIMES TONIGHT AND FLOW
WILL GRADUALLY BECOME ANTICYCLONIC AS WEAK SHORTWAVE RIDGING MOVES
INTO THE REGION. THIS COMBINED WITH DECENT LOW AND MID LEVEL
DRYING WILL RESULT IN CLEARING SKIES WITH THE CAPE/ISLANDS THE
LAST TO CLEAR. LOWS WILL RANGE FROM THE UPPER 30S TO LOWER 40S.

&&

.SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/...
SATURDAY...
FAIRLY POTENT MID LEVEL SHORTWAVE AND ASSOCD COLD FRONT WILL BE
MOVING EAST FROM THE UPPER LAKES. WEAK SHORTWAVE RIDGING AHEAD OF
THE TROF WILL PROVIDE ENOUGH SUBSIDENCE IN SNE FOR MOSUNNY SKIES
FOR MUCH OF THE DAY ALONG WITH A MODEST WESTERLY BREEZE.
SOUNDINGS SHOW MIXING UP TO 925 MB. TEMPS AT THIS LEVEL ARE NEAR
10C WHICH TRANSLATES TO MAXES 60-65 DEGREES...COOLER HIGHER
TERRAIN.

SATURDAY NIGHT...
MID LEVEL SHORTWAVE MOVES ACROSS SNE WITH COLD FRONT MOVING INTO
W ZONES 00-02Z AND OFF THE COAST AROUND 06Z. MOISTURE AND LOW
LEVEL CONVERGENCE ARE LIMITED BUT SHORTWAVE IS FAIRLY ROBUST AND
THERE IS ENOUGH QG FORCING TO SUPPORT A FEW SHOWERS. WE HAVE 20-30
POPS IN THE GRIDS. BEGIN THE FRONT...W/NW WINDS WILL BECOME GUSTY
OVERNIGHT.

&&

.LONG TERM /SUNDAY THROUGH FRIDAY/...
* MAINLY DRY AND SLIGHTLY COOLER THAN NORMAL ON SUNDAY
* HIGH PRESSURE PREVAILS ON MONDAY
* CHANCE FOR SHOWERS TUE NIGHT/WED WITH A COLD FRONTAL PASSAGE
* POTENTIAL FOR LOW PRESSURE SYSTEM IN OUR VICINITY AT THE END OF
  NEXT WEEK

DETAILS...

SUN...AT THE SURFACE A LOW PRESSURE SYSTEM WILL CROSS THROUGH THE
CANADIAN MARITIMES DURING THE DAY...WITH ITS ASSOCIATED COLD FRONT
PULLING FURTHER OFFSHORE FROM SOUTHERN NEW ENGLAND.  FAIRLY TIGHT
PRESSURE GRADIENT OVER OUR AREA WITH SOME COLD AIR ADVECTION AND
H850 WINDS 30 TO 40 KT...SO WILL LIKELY HAVE A BLUSTERY NW WIND ON
SUN WITH GUSTS 20 TO 30 MPH AT TIMES POSSIBLE. ALOFT...MODELS
CONTINUE TO SHOW ROBUST SHORT WAVE DIGGING INTO UPPER TROUGH AND
MOVING THROUGH OUR AREA. THIS WILL MAINLY BRING CLOUDS TO OUR
AREA...AND POSSIBLY ISOLATED SHOWERS IN FAR WESTERN MA/SW NH. HIGH
TEMPS A FEW DEGREES BELOW NORMAL...MAINLY IN THE 50S.

MON AND TUE... HIGH PRESSURE WILL SLIDE ACROSS THE REGION FROM THE
SW ON MONDAY...WITH ABUNDANT SUNSHINE. A WARM FRONT WILL CROSS THE
GREAT LAKES REGION ON MONDAY...THEN TRACK THROUGH AND NORTH OF OUR
AREA ON TUESDAY. WHILE AN INCREASE IN CLOUDS IS EXPECTED WITH THE
WARM FRONT...THE BETTER CHANCE FOR SHOWERS LOOKS TO BE MINIMAL.
MAINLY DRY CONDITIONS ARE ANTICIPATED IN OUR AREA ON TUESDAY.
TEMPERATURES ARE EXPECTED TO MODERATE...WITH HIGHS IN THE 60S ACROSS
MANY LOCALES.

TUE NIGHT AND WED... SFC COLD FRONT WILL BE SLIDING ACROSS THE
REGION DURING THIS TIMEFRAME AS LOW PRES MOVES THROUGH QUEBEC. PWATS
CLOSE TO THE COLD FRONT APPROACH 1.5 INCHES. ENOUGH INSTABILITY
AVAILABLE FOR SHOWERS IN THE VICINITY OF THE FRONT BUT NOT ENOUGH
FOR THUNDER AT THIS POINT. H850 WINDS 30 TO 40 KT SO SOME GUSTY
WINDS WITH THE SHOWERS STILL POSSIBLE.

THU AND FRI... CONTINUE TO EXPECT BRIEF RIDGING ON THURSDAY BEHIND
THE FRONTAL PASSAGE. HOWEVER MODEL DISCREPANCIES EXIST ON THE
DEVELOPMENT AND TRACK OF A POTENTIAL LOW PRESSURE SYSTEM.  THE BRIEF
HIGH PRES MAY GIVE WAY TO A COASTAL LOW PRESSURE SYSTEM AT THE END
OF THE WORKWEEK...DEPENDING IN PART ON WHETHER OR NOT THE UPPER
LEVEL TROUGH BECOMES A CUTOFF LOW. HAVE SLIGHT CHANCE TO CHANCE POPS
FOR THURSDAY NIGHT AND ON.

&&

.AVIATION /00Z SATURDAY THROUGH WEDNESDAY/...
FORECASTER CONFIDENCE LEVELS...

LOW...LESS THAN 30 PERCENT.
MODERATE...30 TO 60 PERCENT.
HIGH...GREATER THAN 60 PERCENT.

SHORT TERM /THROUGH SATURDAY NIGHT/...HIGH CONFIDENCE.

TONIGHT...MVFR CIGS LIFTING TO VFR 00Z-03Z WITH THE EXCEPTION OF
CAPE COD AND THE ISLANDS...WHERE MVFR CIGS SHOULD LIFT TO VFR
BETWEEN 04Z AND 07Z. GRADUAL DECREASE IN CLOUD COVER. AFTER 07Z
VFR WITH CLEARING SKIES.

SATURDAY...VFR.

SATURDAY NIGHT...VFR CIGS. A FEW SHOWERS POSSIBLE WITH BRIEF MVFR
CONDITIONS.

KBOS...HIGH CONFIDENCE OVERALL. CIGS SHOULD RISE FROM MVFR TO VFR
BY 02-03Z.

KBDL...HIGH CONFIDENCE.

OUTLOOK...SUNDAY THROUGH TUESDAY...

HIGH CONFIDENCE. MAINLY VFR. SCATTERED SHOWERS TUESDAY NIGHT/WED
MAY BRING LOCALIZED MVFR CONDITIONS.

&&

.MARINE...
FORECASTER CONFIDENCE LEVELS...

LOW...LESS THAN 30 PERCENT.
MODERATE...30 TO 60 PERCENT.
HIGH...GREATER THAN 60 PERCENT.

SHORT TERM /THROUGH SATURDAY NIGHT/...

TONIGHT...WINDS HAVE DIMINISHED BELOW SCA THRESHOLDS BUT SEAS
REMAIN ABOVE 5 FT OVER THE EASTERN WATERS SO SCA WILL CONTINUE.
SEAS SHOULD SUBSIDE BELOW 5 FT TOWARD DAYBREAK.

SATURDAY...NW WINDS IN THE MORNING BECOME W/SW IN THE AFTERNOON AS
COLD FRONT APPROACHES FROM THE WEST. WIND GUSTS TO 20 KT LIKELY
DURING THE AFTERNOON. SEAS BELOW SCA.

SATURDAY NIGHT...EXPECT INCREASING WEST WINDS THROUGH THE NIGHT
AS COLD FRONT MOVES ACROSS THE WATERS. GOOD POST FRONTAL MIXING
SUPPORTS WIND GUSTS TO 30 KT WITH BUILDING SEAS...ESPECIALLY OVER
SOUTH COASTAL WATERS. SMALL CRAFT ADVISORIES WILL BE NEEDED.

OUTLOOK...SUNDAY THROUGH TUESDAY...

SUNDAY AND SUNDAY NIGHT...HIGH CONFIDENCE IN AT LEAST SMALL CRAFT
ADVISORY CONDITIONS. NW WINDS WITH GUSTS OF 20 TO 30 KTS EXPECTED
BEHIND A COLD FRONT THAT WILL BE MOVING OFFSHORE SUNDAY MORNING.
SEAS 5-8 FT. LOW CHANCE FOR A PERIOD OF GALE FORCE GUSTS LATE SUN OR
SUN NIGHT.

MONDAY...MODERATE CONFIDENCE...SCA SEAS EXPECTED TO LINGER OVER THE
COURSE OF THE DAY BUT GRADUALLY SUBSIDE. WINDS GRADUALLY DIMINISH AS
WELL AS HIGH PRESSURE BUILDS OVER THE WATERS.

TUESDAY...MODERATE CONFIDENCE...WINDS AND SEAS BELOW SCA THRESHOLD
AS HIGH PRESSURE IS STILL OVER THE REGION.

WEDNESDAY...LOW CONFIDENCE ON TIMING. COLD FRONT APPROACHES AND
CROSSES THROUGH THE WATERS. SCA WINDS/SEAS POSSIBLE.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...NONE.
MA...NONE.
NH...NONE.
RI...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL 8 AM EDT SATURDAY FOR ANZ250-254.
     SMALL CRAFT ADVISORY UNTIL 2 AM EDT SATURDAY FOR ANZ251.
     SMALL CRAFT ADVISORY UNTIL 10 PM EDT THIS EVENING FOR ANZ255.

&&

$$
SYNOPSIS...KJC/NMB
NEAR TERM...KJC/NMB
SHORT TERM...KJC
LONG TERM...NMB
AVIATION...KJC/NMB
MARINE...KJC/NMB



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