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Area Forecast Discussion
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000
FXUS61 KBOX 310141
AFDBOX

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE TAUNTON MA
940 PM EDT WED JUL 30 2014

.SYNOPSIS...
MAINLY DRY/PLEASANT WEATHER TODAY OTHER THAN PERHAPS A BRIEF PASSING 
SPRINKLE.  A FEW SHOWERS AND PERHAPS A THUNDERSTORM OR TWO ARE 
POSSIBLE THU AND FRI...BUT MOST OF THE TIME WILL FEATURE DRY 
WEATHER. CONFIDENCE IS INCREASING IN A PERIOD OF STEADY RAIN
SOMETIME THIS WEEKEND AS LOW PRESSURE TRACKS CLOSE TO THE COAST.

&&

.NEAR TERM /UNTIL 6 AM THURSDAY MORNING/...

940 PM UPDATE...

SCATTERED SHOWERS ACROSS WESTERN NEW YORK WILL CONTINUE TO WEAKEN AS 
THEY MOVE EAST AWAY FROM THE BETTER FORCING/INSTABILITY.  
THEREFORE...WILL MAINTAIN A DRY FORECAST OVERNIGHT.  WHILE WE MAY 
SEE SOME DEBRIS CLOUDS FROM THE ACTIVITY...LIGHT WINDS/RELATIVELY 
DRY AIR IN PLACE SHOULD STILL ALLOW LOW TEMPS TO FALL BACK INTO THE 
50S IN MOST LOCALES WITH LOWER 60S IN THE URBAN HEAT ISLANDS OF 
DOWNTOWN BOSTON/PROVIDENCE.

&&

.SHORT TERM /6 AM THURSDAY MORNING THROUGH THURSDAY NIGHT/...
A POTENT SHORTWAVE WILL BE MOVING INTO NORTHERN NEW ENGLAND THURSDAY.
MARGINAL INSTABILITY WILL DEVELOP ACROSS OUR NORTHERN AND WESTERN
ZONES...WITH CAPES ON THE ORDER OF 500 TO 1000 J/KG. 0 TO 6 KM
SHEAR IS FAIRLY STRONG...AROUND 40 KNOTS. THE CORE OF THE 500 MB
COLD POOL TEMPERATURES AROUND -18 TO -20C...WHICH IS QUITE COLD
FOR THIS TIME OF YEAR.

THE BEST DYNAMICS WILL BE TO OUR NORTH AND WEST. HOWEVER...ENOUGH
PARAMETERS ARE IN PLACE FOR A FEW HIT OR MISS SHOWERS OR
THUNDERSTORMS ACROSS THE INTERIOR...ESPECIALLY ACROSS NORTHWEST MA
AND SOUTHWEST NH. WHILE INSTABILITY IS RATHER MARGINAL...THE COLD
POOL ALOFT AND ROBUST SHEAR MAY RESULT IN A FEW STRONG STORMS
PRODUCING SMALL HAIL AND/OR GUSTY WINDS.

INSTABILITY WEAKENS THURSDAY NIGHT...SO SHOWERS AND THUNDERSTORM
COVERAGE DECREASES THROUGH THE EVENING.

&&

.LONG TERM /FRIDAY THROUGH WEDNESDAY/...
HIGHLIGHTS...

* AN ISOLATED THUNDERSTORM IS POSSIBLE ON FRIDAY
* VERY UNSETTLED PATTERN FOR THE WEEKEND
* SHOWERS AND THUNDERSTORMS POSSIBLE EARLY NEXT WEEK

MODELS AND CONFIDENCE...

12Z MODEL GUIDANCE IS STILL IN GOOD AGREEMENT WITH THE FORECAST. A 
STRONG TROUGH WILL DOMINATE ACROSS THE MIDWEST FOR THE REMAINDER OF 
THIS WEEK INTO THE WEEKEND. A STALLED FRONT OVER THE EASTERN 
SEABOARD WILL BE THE FOCUS FOR HEAVY RAIN FOR THE WEEKEND AS SEVERAL 
WAVES RIDE ALONG THIS FRONT.  OUT WEST...AN UPPER LEVEL RIDGE WILL 
CONTINUE TO BUILD ACROSS THE WESTERN CONUS AND EVENTUALLY MOVE INTO 
THE PLAINS. THIS WILL ALLOW FOR THE UPPER LEVEL TROUGH TO TURN MORE 
ZONAL BY THE FIRST HALF OF THE WEEK. BECAUSE OF THE OVERALL 
AGREEMENT TRENDED TOWARDS A BLEND OF THE MODELS AND PREVIOUS 
FORECAST FOR THIS PACKAGE. FOR CONFIDENCE LEVEL...HAVE HIGH 
CONFIDENCE ON TRENDS FOR THIS FORECAST...BUT A LOW CONFIDENCE ON 
EXACT TIMING. 

DETAILS...

FRIDAY...

SOUTHWESTERLY FLOW WILL ALLOW FOR GULF MOISTURE TO BEGIN TO SEEP 
INTO THE REGION BY FRIDAY. TEMPERATURES WILL BE CLOSE TO AVERAGE 
WITH A MIXTURE OF CLOUDS AND SUN. MODELS TRY TO PUSH OUT SOME QPF 
BUT DO NOT HAVE A GOOD FEELING AS HIGH PRESSURE OUT EAST BUILD 
ALLOWING FOR AN INCREASE IN HEIGHTS. IN FACT SOME OF THE INSTABILITY 
PARAMETERS MOVE WESTWARD THROUGHOUT THE DAY. SO FOR NOW MENTIONED 
JUST ISOLATED THUNDERSTORMS...BUT WITH A LOWER CONFIDENCE. 

SATURDAY INTO SUNDAY...

MAIN FOCUS ON THE FORECAST WAS FOCUS ON THE WEEKEND. GUIDANCE 
CONTINUES TO SHOW THAT A SLUG OF RAIN WILL IMPACT NEW ENGLAND 
SOMETIME DURING THE WEEKEND...BUT THERE IS STILL SOME DIFFERENCES IN 
TIMING. OVERALL A STALLED FRONT WILL BE DRAPED ACROSS THE EASTERN 
SEA BOARD AS A FEW WAVES RIDE ALONG THIS FRONT BRING UNSETTLED 
WEATHER TO THE REGION. APPEARS TO BE 2 DIFFERENT MODEL CAMPS...THE 
GFS/CANADIAN AND THE EC/ECENS/UKMET. THE GFS CAMP BRINGS THE 
HEAVIEST RAIN ON SUNDAY WHILE THE EC CAMP BRINGS IT IN DURING THE 
DAY ON SATURDAY. OVERALL UNIFORM SOUTHWESTERLY FLOW THROUGH THE 
LEVELS WILL ALLOW FOR THE FLOW TO TAP INTO THE GULF MOISTURE 
INCREASING THE PWATS CLOSE TO 2 INCHES...AND ALMOST 2 STANDARD 
DEVIATIONS AWAY. BOTH MODELS ARE ALSO SHOWING A GOOD 850 MB LLJ INTO 
THE FLOW AT RESPECTIVE TIMES FOR HEAVY RAIN TO OCCUR. ALSO BECAUSE 
OF THE INCREASING LLJ CANNOT RULE OUT A RUMBLE OF THUNDER. 
CONFIDENCE IS MODERATE TO HIGH THAT HEAVIER RAIN WILL OCCUR...JUST A 
MATTER OF FINE TUNING THE TIMING OF WHEN IT WILL IMPACT SOUTHERN NEW 
ENGLAND. 

WORK WEEK...
 
UPPER LEVEL FLOW WILL BECOME MORE ZONAL BY THE BEGINNING OF THE WORK 
WEEK. HOWEVER APPEARS THAT THERE MAY BE SOME LINGERING SHOWERS ON 
MONDAY...WITH A BETTER SHOT ON TUESDAY AS FRONT SLIDES THROUGH THE 
REGION. HOWEVER TIMING OF THIS SYSTEM MAY CHANGE AS IT IS STILL 6-7 
DAYS AWAY.

&&

.AVIATION /01Z THURSDAY THROUGH MONDAY/...
FORECASTER CONFIDENCE LEVELS...

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

SHORT TERM...TODAY THROUGH THURSDAY...

THROUGH 02Z...HIGH CONFIDENCE. VFR. SEA BREEZES SHOULD BEGIN TO
DISSIPATE...UNCERTAIN ON THE TIMING. 

TONIGHT AND THURSDAY...HIGH CONFIDENCE. PATCHY LATE NIGHT LOW
CLOUDS AND FOG WITH LOCAL IFR POSSIBLE. MAINLY VFR CONDITIONS. A
FEW HIT AND MISS SHOWERS/THUNDERSTORMS ARE EXPECTED DURING THE DAY
THURSDAY ACROSS THE INTERIOR...WHICH MAY RESULT IN BRIEFLY LOWER
CIGS/VSBYS.

THURSDAY NIGHT...MODERATE CONFIDENCE. MAINLY VFR...WITH LOCAL IFR
IN LOW CLOUDS AND PATCHY FOG.

KBOS TAF...HIGH CONFIDENCE IN TAF. MODERATE CONFIDENCE IN END
TIME OF SEA BREEZE THIS EVENING.

KBDL TAF...HIGH CONFIDENCE IN TAF.

OUTLOOK...FRIDAY THROUGH SUNDAY...

FRIDAY...HIGH CONFIDENCE. MAINLY VFR. LOW PROBABILITY OF A BRIEF 
PERIOD OF MVFR CONDITIONS IN -SHRA.

SATURDAY AND SUNDAY...MODERATE CONFIDENCE.  MVFR CIGS/VSBYS IN 
SCATTERED SHOWERS. POSSIBLE MVFR/IFR CONDITIONS MORE PROBABLE TOWARDS 
EASTERN MA/RI IN -RA AND ISO THUNDER.

MONDAY...MODERATE CONFIDENCE. CONDITIONS IMPROVING TO VFR.

&&

.MARINE...
FORECASTER CONFIDENCE LEVELS...

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

SHORT TERM...TODAY THROUGH THURSDAY NIGHT...

HIGH CONFIDENCE. WINDS/SEAS SHOULD GENERALLY REMAIN BELOW SMALL
CRAFT ADVISORY LEVELS THROUGH THURSDAY NIGHT ALONG WITH GOOD
VISIBILITIES. LOW RISK OF MARGINAL 5 FOOT SWELL REACHING INTO THE
SOUTHERN AND EASTERN ATLANTIC WATERS TONIGHT AND THURSDAY FROM A
DISTANT OFFSHORE LOW PRESSURE. BASED ON MOST WAVE GUIDANCE...
CAPPED SEAS AT 4 FEET FOR NOW BUT LATER SHIFTS WILL HAVE TO
REEVALUATE. 

OUTLOOK...FRIDAY THROUGH MONDAY...

FRIDAY...HIGH CONFIDENCE. QUIET BOATING WEATHER EXPECTED WITH HIGH 
PRESSURE OVER THE WATERS.

SATURDAY AND SUNDAY...MODERATE CONFIDENCE.  WINDS AND SEAS ARE 
FORECAST TO REMAIN BELOW SMALL CRAFT ADVISORY CRITERIA.  
HOWEVER...MORE UNSETTLED WEATHER IS LIKELY WITH A STATIONARY FRONT 
WAVERING OVER THE WATERS. BRING SEVERAL ROUNDS OF RAIN AND ISOLATED 
THUNDER.

MONDAY...MODERATE CONFIDENCE. IMPROVING VSBY CONDITIONS WITH 
SEAS/WINDS STILL BELOW SCA.

&&

.BOX WATCHES/WARNINGS/ADVISORIES...
CT...NONE.
MA...NONE.
NH...NONE.
RI...NONE.
MARINE...NONE.

&&

$$
SYNOPSIS...BELK/DUNTEN
NEAR TERM...FRANK
SHORT TERM...BELK
LONG TERM...DUNTEN
AVIATION...BELK/DUNTEN
MARINE...BELK/DUNTEN



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