253
FXUS61 KBOX 141911
AFDBOX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
311 PM EDT THU MAY 14 2026
WHAT HAS CHANGED
TIMING OF STEADIER RAIN INTO EASTERN MA AND RI NOW LOOKS MORE
FOCUSED INTO EARLY AFTERNOON, WITH DOWNPOURS DEVELOPING BY MID
TO LATE THIS AFTERNOON.
KEY MESSAGES
- RAIN CONTINUES EASTWARD THIS AFTERNOON AND EVENING BEFORE
CLEARING FOR MOST EARLY TONIGHT. DREARY AGAIN FRIDAY.
- WARMER TEMPERATURES FOR THE WEEKEND INTO NEXT WEEK, WITH
MOSTLY DRY WEATHER.
- POTENTIAL FOR THUNDERSTORMS RETURNS TUE/WED, A FEW OF WHICH
COULD BE STRONG TO SEVERE.
DISCUSSION
KEY MESSAGE 1...RAIN CONTINUES EASTWARD THIS AFTERNOON AND EVENING
BEFORE CLEARING FOR MOST EARLY TONIGHT. DREARY AGAIN FRIDAY.
RAIN CURRENTLY OVER CENTRAL MA, RI, AND EASTERN CT WILL SLOWLY
CONTINUE EAST AND NORTH THIS AFTERNOON AND EVENING AHEAD OF AN
OCCLUDED FRONT PUSHING THROUGH SOUTHERN NEW ENGLAND. GUIDANCE
INDICATES THE MOISTURE PLUME FROM THE SOUTH HELPING FUEL THIS
RAINFALL HAS PWAT VALUES BETWEEN 1-1.25", WITH THE HIGHER VALUES
FURTHER TO THE EAST ALONG THE COAST AND OVER CAPE COD AND THE
ISLANDS. WITH REGARDS TO THE CHANCES FOR SOME EMBEDDED THUNDER LATER
THIS EVENING, THE CHANCES ARE STILL LOW, BUT LATEST MESOANALYSIS
DOES HAVE SOME POCKETS OF INSTABILITY OVER EASTERN MA. SO,
OCCASIONAL RUMBLES OF THUNDER CANNOT BE COMPLETELY RULED OUT.
RAINFALL TOTALS EXPECTED TO RANGE BETWEEN 0.5" TO 1.5"; HIGHER
TOTALS ARE MOST LIKELY IN NORTHERN MA, WITH SOUTHERN RI SEEING
THE LOWER END OF THE SCALE. ELSEWHERE ACROSS THE REGION, TOTALS
AROUND 0.75-1.00" ARE MORE LIKELY. LOWS TONIGHT WILL LIKELY BE
IN THE MID TO UPPER 40S.
RAIN WILL TAPER OFF AND BECOME MORE OF A DRIZZLE TONIGHT, LIKELY
SOMETIME BEFORE MIDNIGHT, AS A SURFACE LOW PASSES RIGHT OVER
SOUTHERN NEW ENGLAND BEHIND THE FRONT. THIS FEATURE WILL ALSO AID IN
THE RETURN OF ONSHORE FLOW. NE WINDS ARE EXPECTED TO CONTINUE
THROUGH FRIDAY, LIMITING THE CHANCE FOR ANY SIGNIFICANT IMPROVEMENTS
TO CLOUD COVER. THE ASSOCIATED UPPER LEVEL LOW THAT'S CURRENTLY
CENTERED OVER LAKE ONTARIO WILL MOVE IN OVERHEAD, AND WITH IT,
COOLER TEMPERATURES ALOFT THROUGH THE COLUMN. 950 MB TEMPERATURES
AROUND 6-8C TOMORROW AFTERNOON COMBINED WITH THE PERSISTENT CLOUD
COVER WILL LIKELY KEEP HIGH TEMPERATURES IN THE 50S.
KEY MESSAGE 2...WARMER TEMPERATURES FOR THE WEEKEND INTO NEXT
WEEK, WITH MOSTLY DRY WEATHER.
A MUCH IMPROVED FORECAST AS WE HEAD INTO THE WEEKEND AND MID LEVEL
HEIGHTS WILL FINALLY BE ON THE RISE AS A MARGINAL RIDGING/ZONAL
PATTERN MOVES IN FOR THE WEEKEND. THIS W/SW FLOW ADVECTS A MUCH
WARMER AIRMASS OVERHEAD AT 850 MB TEMPS RISE FROM 3C FRIDAY TO 12C
OVER THE WEEKEND AND THEN SURGING TO NEAR 18C BY TUESDAY/WEDNESDAY.
THE RESULT WILL BE A STRETCH OF WARM WEATHER THIS WEEKEND, THEN
HIGHLY ANOMALOUS WARMTH BY TUESDAY. HIGH TEMPERATURES ON SATURDAY
WILL SIT COMFORTABLY IN THE 70S, WITH UPPER 70S MORE LIKELY SUNDAY
AND MONDAY, PEAKING ON TUESDAY WITH POTENTIAL FOR WIDESPREAD 80S.
THIS, WITH DEWPOINTS SURGING WELL INTO THE 60S MAY MAKE FOR A BIT OF
A MUGGY DAY.
KEY MESSAGE 3...POTENTIAL FOR THUNDERSTORMS RETURNS TUE/WED, A
FEW OF WHICH COULD BE STRONG TO SEVERE.
AS PREVIOUSLY MENTIONED, DEWPOINTS ARE EXPECTED TO SURGE INTO THE
60S ON TUESDAY AND THIS TOGETHER WITH TEMPS IN THE 80S WILL
CONTRIBUTE TO >1000 J/KG OF SURFACE BASED CAPE WITH LOW LEVEL LAPSE
RATES OF 8-9C/KM. LOTS OF INSTABILITY, BUT THE MISSING PIECE IS A
GOOD FORCING MECHANISM AS THE COLD FRONT UNTIL LATER WED OR WED
NIGHT. THAT BEING SAID, THERE ARE SIGNS OF ENOUGH OF A KINK IN THE
LOW LEVEL FLOW THAT THERE COULD BE ENOUGH CONVERGENCE TO KICK OFF
SOME STORMS. LACK OF BULK SHEAR AND POOR ML LAPSE RATES WOULD LIMIT
VERTICAL GROWTH AND HOW STRONG ANY STORMS COULD GET BUT CSU AND NSSL
MACHINE LEARNING GUIDANCE BOTH HIGHLIGHT TUESDAY WITH A POSSIBILITY
OF SOME SEVERE STORMS. STAY TUNED.
AVIATION /19Z THURSDAY THROUGH TUESDAY/
FORECASTER CONFIDENCE LEVELS...
LOW - LESS THAN 30 PERCENT.
MODERATE - 30 TO 60 PERCENT.
HIGH - GREATER THAN 60 PERCENT.
18Z TAF UPDATE:
REST OF TODAY: MODERATE CONFIDENCE.
IFR/MVFR OVERSPREADS THE REGION THROUGH THE REST OF THIS
AFTERNOON AND EVENING AS SHOWERS SLOWLY PROGRESS N/NE. LOW
CHANCE FOR TS FOR EASTERN TERMINALS WHERE THERE IS SOME LOW
INSTABILITY PRESENT, BUT FELT IT WAS SUFFICIENT ENOUGH TO
MENTION AS A TEMPO FOR VARIOUS TERMINALS. FURTHER IN THE
INTERIOR, SHOWERS WILL BE A POSSIBILITY THROUGH 00Z THIS
EVENING. VISBYS WILL BE LOWER UNDER HEAVIER DOWNPOURS, REACHING
MVFR WITH SOME IFR POSSIBLE.
E TO SE WINDS THRU THIS AFTERNOON, AND COULD BECOME LIGHT NE/N
IN THE INTERIOR.
TONIGHT: MODERATE CONFIDENCE.
STEADIER SHRA TAPERS OFF TO AN INTERMITTENT -SHRA OR EVEN -DZ
BY 00-03Z. MVFR/IFR CEILINGS THEN DETERIORATE TO IFR TO LIFR.
MIST/FOG POSSIBLE TOO WITH IFR VISBYS. COASTAL NE WINDS 5-10 KT,
INTERIOR WINDS N/NW 5 KT OR LESS. BRIEF PERIOD OF
FRIDAY: MODERATE CONFIDENCE.
IFR GENERALLY PREVAILS, THOUGH SOME OPTIMISM FOR MVFR CEILINGS
TOWARD BDL EARLY IN THE MORNING (POSSIBLY EVEN BRIEF VFR THERE
AS WELL). PERIODS OF LIGHT -SHRA OR -DZ, WITH BETTER CHANCE FOR
STEADIER LIGHT RAIN FOR EASTERN/COASTAL MA. NE WINDS BECOME
N/NW AROUND 5-10 KT, THOUGH AROUND 10-12 KT FOR EASTERN MA.
FRIDAY NIGHT: MODERATE CONFIDENCE.
IMPROVEMENT FROM IFR TO VFR THROUGH THE NIGHT, WITH IFR
LINGERING OVER THE CAPE AND ISLANDS. LIGHT W WINDS GENERALLY
AROUND 5 KT.
KBOS...MODERATE CONFIDENCE. IFR-VISBY MODERATE TO HEAVY SHRA BY
20Z WITH WINDS BECOMING EASTERLY AROUND 10 KT. SHRA ENDS AROUND
02-03Z TO MORE OF A -DZ BUT CEILINGS THEN GO TO IFR/LIFR LEVELS
AS WINDS BECOME NE. LOW PROB FOR TS BETWEEN 19-23Z.
KBDL...MODERATE CONFIDENCE. RAIN TAPERS OFF TO INTERMITTENT
SHRA/DZ BY 00Z, BUT CEILINGS THEN GO TO IFR/LIFR LEVELS,
POSSIBLY IMPROVING TO MVFR THROUGH THE NIGHT INTO TOMORROW
MORNING.
OUTLOOK /SATURDAY THROUGH TUESDAY/...
SATURDAY THROUGH SUNDAY: VFR. BREEZY.
SUNDAY NIGHT THROUGH MONDAY NIGHT: VFR.
TUESDAY: VFR. BREEZY.
MARINE
FORECASTER CONFIDENCE LEVELS...
LOW - LESS THAN 30 PERCENT.
MODERATE - 30 TO 60 PERCENT.
HIGH - GREATER THAN 60 PERCENT.
SE TO E WINDS AROUND 10-15 KT THROUGH THE REST OF TODAY, BUT
EASTERLY SWELL INCREASES WAVE HEIGHTS TO AROUND 4-7 FT TONIGHT
AND CONTINUE INTO FRIDAY. SMALL CRAFT ADVISORIES HAVE BEEN
ISSUED TO ACCOUNT FOR THE RISING SEAS. RAIN WITH EMBEDDED
DOWNPOURS CONTINUE THROUGH THIS AFTERNOON AND EVENING, WITH
MORE INTERMITTENT SHOWERS, DRIZZLE AND FOG FOR TONIGHT INTO
FRIDAY.
WINDS REMAIN GENERALLY BELOW 15 KT FOR FRIDAY NIGHT. SEAS WILL
START TO DIMINISH FRIDAY NIGHT AS A COASTAL LOW WELL OFFSHORE
CONTINUES PULLING AWAY, THOUGH SMALL CRAFT ADVISORIES MAY NEED
TO CONTINUE THROUGH THE OVERNIGHT HOURS THEN.
OUTLOOK /SATURDAY THROUGH TUESDAY/...
SATURDAY THROUGH SATURDAY NIGHT: LOW RISK FOR SMALL CRAFT
ADVISORY WINDS WITH GUSTS UP TO 25 KT. SEAS UP TO 5 FT.
SUNDAY THROUGH TUESDAY: WINDS LESS THAN 25 KT. AREAS OF SEAS
APPROACHING 5 FT.
BOX WATCHES/WARNINGS/ADVISORIES
CT...NONE.
MA...NONE.
RI...NONE.
MARINE...SMALL CRAFT ADVISORY FROM 2 AM FRIDAY TO 2 AM EDT SATURDAY FOR
ANZ235-237-251.
SMALL CRAFT ADVISORY FROM 11 PM THIS EVENING TO 8 AM EDT
SATURDAY FOR ANZ250-254>256.
DISCUSSION...BW/HRENCECIN
AVIATION...BW/HRENCECIN
MARINE...BW/HRENCECIN
CLICK HERE TO GO TO PREVIOUS BULLETINS.
Main Text Page