Area Forecast Discussion
Issued by NWS Boston, MA

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000 FXUS61 KBOX 010718 AFDBOX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE TAUNTON MA 318 AM EDT FRI AUG 1 2014 .SYNOPSIS... SCATTERED SHOWERS AND ISOLATED THUNDERSTORMS EXPECTED AGAIN FRIDAY AFTERNOON...MAINLY NORTHWEST OF I-95. THE WEEKEND FORECAST REMAINS UNCERTAIN...BUT THE POTENTIAL FOR PERIODS OF WET WEATHER CONTINUES. SHOWERS AND THUNDERSTORMS POSSIBLE MONDAY AHEAD OF COLD FRONT. THEN DRY HIGH PRESSURE. && .NEAR TERM /UNTIL 6 AM THIS MORNING/... 2 AM UPDATE... AREAS OF FOG...SOME OF WHICH WAS LOCALLY DENSE HAS DEVELOPED MAINLY ACROSS SOUTHERN NH/NORTHWEST MA AS A RESULT OF THE WET GROUND FROM YESTERDAY/S RAINFALL. AREAS OF FOG MAY DEVELOP ACROSS OTHER LOCATIONS...BUT IT WILL BE MOST PREVALENT IN OUR NORTHWEST ZONES THROUGH DAYBREAK. LOW TEMPS BY DAYBREAK SHOULD MAINLY BE IN THE 50S TO LOWER 60S IN MOST LOCATIONS. && .SHORT TERM /6 AM THIS MORNING THROUGH 6 PM SATURDAY/... FRIDAY...HIGH PRESSURE REMAINS CENTERED OFFSHORE...WITH A DEEP UPPER TROUGH LINGERING OVER EASTERN CANADA INTO THE GREAT LAKES REGION AND MISSISSIPPI VALLEY. THIS PLACES OUR AREA IN SW FLOW...AND THE MODELS ARE INDICATING A MOISTURE RICH ENVIRONMENT UPSTREAM IN THE SOUTHEASTERN U.S. THIS WILL BRING A GRADUAL INCREASE IN MOISTURE ACROSS OUR AREA FRIDAY INTO FRIDAY NIGHT. DURING FRIDAY SOME AFTERNOON DIURNAL CONVECTION IS POSSIBLE...CAPE INCREASING TO A FEW HUNDRED J/KG ACROSS THE INTERIOR. A SHORT WAVE MOVING THROUGH THE AREA MAY ASSIST AS A TRIGGER. SHEAR IS LESS THAN TODAY AND 500 MB TEMPS ARE NOT AS COLD. FRIDAY NIGHT...INCREASING MOISTURE CONTINUES. AN OFFSHORE FRONT IS EXPECTED TO BACK WESTWARD TOWARDS OUR COASTLINE...AND MODELS INDICATE THE POTENTIAL FOR AN OPEN WAVE DEVELOPING ALONG THIS FRONT. OVER THE COURSE OF THE NIGHT INCREASING CLOUDS ARE EXPECTED...WITH RAIN/SHOWERS POSSIBLE LATE. THERE IS SOME UNCERTAINTY ON THE PLACEMENT OF THE LOW FOR 12Z SAT...GENERALLY BETWEEN THE CAROLINAS AND MID ATLANTIC COASTLINE. && .LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/... HIGHLIGHTS... * STEADY RAIN LIKELY SOMETIME THIS WEEKEND * SHOWERS AND THUNDERSTORMS POSSIBLE EARLY NEXT WEEK THE MODELS ARE IN FAIRLY GOOD AGREEMENT THROUGH THE LONG TERM. HOWEVER...THERE ARE DEFINITELY DIFFERENCES BOTH IN THE DETAILS AND ALSO IN PARTS OF THE SYNOPTIC PATTERN...PARTICULARLY AROUND THE POTENTIAL SYSTEM FOR THE WEEKEND. USED A BLEND OF AVAILABLE GUIDANCE FOR MUCH OF THE FORECAST. SATURDAY NIGHT AND SUNDAY...A STATIONARY FRONT OFF THE COAST SHIFTS WEST OVER SOUTHERN NEW ENGLAND. COMBINED WITH AN INCREASE IN SUBTROPICAL MOISTURE...EXPECT A FAIRLY STEADY RAINFALL ACROSS AT LEAST A PORTION OF SOUTHERN NEW ENGLAND THROUGH PART OF THIS TIME. THERE ARE STILL DIFFERENCES IN THE MODELS BOTH IN THE WESTWARD EXTENT OF THE FRONT AND IN THE TIMING SO RAIN IS POSSIBLE THROUGHOUT THIS TIME PERIOD AND ACROSS THE REGION. HOWEVER...THE HIGHEST LIKELIHOOD FOR RAIN IS ALONG THE SOUTH COAST...RI...AND SE MA. THE NAM INDICATES ENOUGH INSTABILITY FOR SOME ISOLATED THUNDER...BUT IT IS ALONE IN FORECASTING THAT SO WILL LEAVE IT OUT FOR THE TIME BEING. MONDAY AND TUESDAY...STATIONARY FRONT SLOWLY SHIFTS BACK OFFSHORE BRINGING AN END TO THE STEADY RAINFALL. HOWEVER...LOW PRESSURE MOVING THROUGH QUEBEC WILL BRING A COLD FRONT TOWARDS SOUTHERN NEW ENGLAND. EXPECT THE POSSIBILITY FOR SHOWERS AND THUNDERSTORMS PERIODICALLY. WEDNESDAY AND THURSDAY...HIGH PRESSURE BUILDS IN BEHIND THE COLD FRONT. COOLER BUT QUIET WEATHER IS EXPECTED. && .AVIATION /07Z FRIDAY THROUGH TUESDAY/... FORECASTER CONFIDENCE LEVELS... LOW...LESS THAN 30 PERCENT. MODERATE...30 TO 60 PERCENT. HIGH...GREATER THAN 60 PERCENT. SHORT TERM...TODAY THROUGH SATURDAY... TODAY...MODERATE TO HIGH CONFIDENCE. AREAS OF FOG WILL AFFECT PORTIONS OF THE REGION THROUGH DAYBREAK...PARTICULARLY IN NORTHWEST MA/SOUTHERN NH WHERE IT WILL BE LOCALLY DENSE. OTHERWISE...CONDITIONS SHOULD IMPROVE TO VFR SHORTLY AFTER SUNRISE IN ALL LOCATIONS. ALSO...EXPECT A FEW HIT AND MISS SHOWERS/THUNDERSTORMS THIS AFTERNOON WHICH MAY RESULT IN BRIEF LOCALIZED LOWER CONDITIONS. TONIGHT...MODERATE TO HIGH CONFIDENCE. MAINLY VFR CONDITIONS OTHER THAN LOCALIZED PATCHY GROUND FOG IN THE TYPICALLY PRONE LOCATIONS LATE. SATURDAY...MODERATE CONFIDENCE. A PERIOD OF STEADY RAIN MAY AFFECT SOUTHERN AND EASTERN SECTIONS OF THE REGION FOR A TIME. THIS MAY RESULT IN VFR CONDITIONS LOWERING TO MVFR THRESHOLDS. KBOS TAF...HIGH CONFIDENCE IN VFR CONDITIONS TODAY AND TONIGHT. A SOUTHEAST SEA BREEZE EXPECTED TO DEVELOP BY AFTERNOON. ALSO...THERE IS VERY LOW PROBABILITY OF A THUNDERSTORM THIS AFTERNOON. KBDL TAF...HIGH CONFIDENCE IN MAINLY VFR CONDITIONS TODAY AND TONIGHT. LOW PROBABILITY OF A THUNDERSTORM THIS AFTERNOON. OUTLOOK...SATURDAY NIGHT THROUGH TUESDAY... SATURDAY NIGHT THROUGH SUNDAY...MODERATE CONFIDENCE. MAINLY VFR NW...CHANCE FOR MVFR CIGS/VSBYS IN SCATTERED SHOWERS. MVFR CONDITIONS MORE PROBABLE TOWARDS EASTERN MA/RI IN -RA. MONDAY AND TUESDAY...MODERATE CONFIDENCE. MAINLY VFR. LOW PROBABILITY OF MVFR/IFR CONDITIONS IN SCT -SHRA/TSRA. COLD FRONT MOVES THROUGH SOUTHERN NEW ENGLAND TUESDAY. && .MARINE... FORECASTER CONFIDENCE LEVELS... LOW...LESS THAN 30 PERCENT. MODERATE...30 TO 60 PERCENT. HIGH...GREATER THAN 60 PERCENT. SHORT TERM...TODAY THROUGH FRIDAY NIGHT... HIGH CONFIDENCE. UPPER LEVEL RIDGE JUST EAST OF THE WATERS WILL KEEP WINDS/SEAS BELOW SMALL CRAFT ADVISORY LEVELS THROUGH FRIDAY AFTERNOON WITH GOOD VISIBILITIES. IN ADDITION...WINDS/SEAS EXPECTED TO REMAIN BELOW SCA THRESHOLDS FRIDAY NIGHT. OUTLOOK...SATURDAY NIGHT THROUGH TUESDAY... SATURDAY NIGHT AND SUNDAY...HIGH CONFIDENCE. QUIET BOATING WEATHER EXPECTED WITH HIGH PRESSURE OVER THE WATERS. RAIN IS LIKELY THROUGH SUNDAY WITH A WAVERING STATIONARY FRONT NEAR OR OVER THE WATERS. VISIBILITIES ARE LIKELY TO BE REDUCED IN FOG. MONDAY AND TUESDAY...HIGH CONFIDENCE. QUIET BOATING WEATHER EXPECTED. COLD FRONT MOVES OVER THE WATERS LATE TUESDAY. && .BOX WATCHES/WARNINGS/ADVISORIES... CT...NONE. MA...NONE. NH...NONE. RI...NONE. MARINE...NONE. && $$ SYNOPSIS...RLG/NMB NEAR TERM...FRANK SHORT TERM...NMB LONG TERM...RLG AVIATION...FRANK/RLG MARINE...RLG/NMB

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