216
FXUS61 KBOX 051816
AFDBOX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
216 PM EDT SUN JUL 5 2026
WHAT HAS CHANGED
A FLOOD WATCH HAS BEEN EXPANDED INTO RHODE ISLAND AND PARTS OF
SOUTHEAST MASS.
KEY MESSAGES
- CONFIDENCE STILL INCREASING IN THE POTENTIAL FOR BANDS OF
HEAVY RAINFALL AND EVEN SOME FLASH FLOODING STARTING LATE
TONIGHT BUT MORE LIKELY MONDAY INTO TUESDAY. THE GREATEST RISK
AREA RIGHT NOW REMAINS IN NORTHERN CT WHERE RECENT HEAVY RAIN
HAS FALLEN AND A FLOOD WATCH REMAINS IN EFFECT AND HAS BEEN
EXPANDED.
- SUMMER WARMTH & HUMIDITY RETURN FOR THE LATTER HALF OF THE
WEEK. A FEW SHOWERS AND THUNDERSTORMS POSSIBLE BY FRIDAY TO
SATURDAY.
DISCUSSION
KEY MESSAGE 1...CONFIDENCE STILL INCREASING IN THE POTENTIAL
FOR BANDS OF HEAVY RAINFALL AND EVEN SOME FLASH FLOODING
STARTING LATE TONIGHT BUT MORE LIKELY MONDAY INTO TUESDAY. THE
GREATEST RISK AREA RIGHT NOW REMAINS IN NORTHERN CT WHERE RECENT
HEAVY RAIN HAS FALLEN AND A FLOOD WATCH REMAINS IN EFFECT AND
HAS BEEN EXPANDED.
TO START WITH THE HIGHEST CONFIDENCE, WE LOOK AT ANTECEDENT
CONDITIONS. HEAVY RAINFALL YESTERDAY IMPACTED MAINLY NORTHERN
CT, ESPECIALLY SOUTHERN HARTFORD COUNTY. AREAS WHERE SOIL
MOISTURE IS APPROACHING 50 PERCENT IS ROUGHLY NORTHERN CT INTO
THE SOUTHERN HALF OF RI AND INTO THE EWB AREA. SIMILARLY 6 HR
FFG IS LOWEST ACROSS SOUTHERN HARTFORD, TOLLAND, AND WINDHAM
COUNTIES, WITH VALUES GENERALLY AT OR BELOW 3 INCHES. FARTHER
NORTH AND EAST THAT INCREASES TO AROUND 4 TO 5 INCHES.
ALSO HIGHER CONFIDENCE IS THE TIMING OF PRECIP. THERE IS A
CHANCE THAT HEAVY RAIN COULD BEGIN THIS EVENING, BUT AS OF THIS
WRITING, CAM GUIDANCE WANTS TO FOCUS THAT MORE TOWARDS LONG
ISLAND SOUND THAN NORTHERN CT. MON INTO TUE LOOKS MORE FAVORABLE
FOR ROUNDS OF HEAVY RAIN/SHOWERS TO PUSH INTO NORTHERN CT AND
PARTS OF RI.
MORE MODERATE CONFIDENCE WILL BE THE LOCATION AND AMOUNTS OF
HEAVY RAIN. ONE THING I CAN SAY FOR SURE IS THAT ALL AVAILABLE
GUIDANCE, FROM GLOBAL TO CONVECTION ALLOWING MESOSCALE WEATHER
MODELS HAVE SOME IMPRESSIVE QPF NUMBERS. MANY INCLUDE MAX QPF
VALUES OF 7 INCHES OR MORE. ONE SUCH PIECE OF GUIDANCE IS THE
05.12Z HREF. 24 HR MAX QPF IS IN THE 7-10 INCH RANGE. FROM PAST
EXPERIENCE AND LOCAL RESEARCH, THE HREF MAX QPF USUALLY DOES
OCCUR EVEN IF THE BLEND STRUGGLES TO PINPOINT THE LOCATION. SO I
THINK IT IS REASONABLE TO PREPARE FOR RAINFALL AMOUNTS ON THAT
ORDER. BEST GUESS AT THIS RANGE WOULD BE IN THE BDL TO PVD
CORRIDOR SOMEWHERE, BUT ANYWHERE SOUTH OF THE MASS PIKE WOULD BE
WISE TO KEEP AN EYE ON TRENDS. WITH THAT IN MIND I FEEL MORE
COMFORTABLE EXPANDED THE FLOOD WATCH EAST INTO RI AND THE FLASH
FLOODING HOTSPOT OF FALL RIVER TO COVER THOSE HIGHER SOIL
MOISTURE AREAS, AND WHERE SYNOPTIC FORCING DO NOT LOOK
MEANINGFULLY DIFFERENT FROM CT.
KEY MESSAGE 2...SUMMER WARMTH & HUMIDITY RETURN FOR THE LATTER
HALF OF THE WEEK. A FEW SHOWERS AND THUNDERSTORMS POSSIBLE BY
FRIDAY TO SATURDAY.
THERE ISN'T A WHOLE LOT MORE TO SAY ABOUT THIS PERIOD. TEMPS
WILL CONTINUE TO CLIMB UNTIL BY FRI A FEW LOCATIONS MAY BE
FLIRTING WITH 90 DEGREES AGAIN. A COLD FRONT WILL APPROACH FROM
THE NORTHWEST AND PROVIDE A FOCUS FOR SHOWERS AND THUNDERSTORMS.
AT THIS TIME THE BEST CHANCES FOR RAIN WILL BE NORTHWEST OF THE
FORECAST AREA THU, BUT BY FRI CHANCES WILL BE MUCH BETTER TO
SEE AT LEAST SCATTERED CONVECTION ACROSS SOUTHERN NEW ENGLAND.
AVIATION /18Z SUNDAY THROUGH FRIDAY/
FORECASTER CONFIDENCE LEVELS...
LOW - LESS THAN 30 PERCENT.
MODERATE - 30 TO 60 PERCENT.
HIGH - GREATER THAN 60 PERCENT.
18Z TAF UPDATE...
TODAY THROUGH MONDAY...MODERATE CONFIDENCE.
MAINLY VFR THIS AFTERNOON BUT SOME LOWER MVFR CONDITIONS
POSSIBLE AT TIMES TODAY IN A FEW SHOWERS ACROSS WESTERN MA/CT
AND NEAR THE SOUTH COAST. MVFR CONDITIONS BECOME MORE WIDESPREAD
ACROSS WESTERN MA/CT LATER TONIGHT AND MON ALONG WITH PERIODS
OF SHOWERS WITH LOCALLY HEAVY RAINFALL.
LIGHT ESE WINDS TODAY AND TONIGHT BECOMING E AT 6 TO 13 KNOTS ON
MON.
KBOS TERMINAL...HIGH CONFIDENCE IN TAF.
KBDL TERMINAL...HIGH CONFIDENCE IN TAF.
OUTLOOK /MONDAY NIGHT THROUGH FRIDAY/...
TUESDAY: MVFR/IFR CONDITIONS POSSIBLE. BREEZY. SHRA LIKELY,
SLIGHT CHANCE TSRA, PATCHY BR.
TUESDAY NIGHT: MAINLY VFR, WITH LOCAL IFR POSSIBLE. CHANCE
SHRA.
WEDNESDAY THROUGH WEDNESDAY NIGHT: VFR.
THURSDAY: VFR. BREEZY.
THURSDAY NIGHT: VFR. SLIGHT CHANCE SHRA, SLIGHT CHANCE TSRA.
FRIDAY: VFR. BREEZY. CHANCE SHRA, CHANCE TSRA.
MARINE
FORECASTER CONFIDENCE LEVELS...
LOW - LESS THAN 30 PERCENT.
MODERATE - 30 TO 60 PERCENT.
HIGH - GREATER THAN 60 PERCENT.
TODAY AND TONIGHT...HIGH CONFIDENCE.
HIGH PRESSURE OVER EASTERN CANADA COMBINED WITH A WAVE OF LOW
PRESSURE PASSING TO OUR SOUTH WILL RESULT IN ESE WINDS THIS
AFTERNOON AND TONIGHT...BUT THE WINDS/SEAS SHOULD REMAIN BELOW
SMALL CRAFT ADVISORY THRESHOLDS.
MONDAY...MODERATE CONFIDENCE.
WAVE OF LOW PRESSURE PASSING TO OUR SOUTH SHOULD RESULT IN E WIND
GUSTS INCREASING TO AROUND 25+ KNOTS ACROSS OUR SOUTHERN WATERS.
LATER SHIFTS WILL LIKELY NEED TO ISSUE SMALL CRAFT ADVISORIES FOR
OUR SOUTHERN WATERS AND WE MAY NEED TO EXPAND THEM FURTHER NORTH
MONDAY NIGHT.
OUTLOOK /MONDAY NIGHT THROUGH FRIDAY/...
TUESDAY: LOW RISK FOR SMALL CRAFT ADVISORY WINDS WITH GUSTS UP
TO 30 KT. SEAS UP TO 5 FT. RAIN SHOWERS LIKELY, SLIGHT CHANCE
OF THUNDERSTORMS, PATCHY FOG. LOCAL VISIBILITY 1 TO 3 NM.
TUESDAY NIGHT: WINDS LESS THAN 25 KT. SEAS UP TO 5 FT. CHANCE
OF RAIN SHOWERS.
WEDNESDAY THROUGH WEDNESDAY NIGHT: WINDS LESS THAN 25 KT. SEAS
UP TO 5 FT.
THURSDAY: WINDS LESS THAN 25 KT. AREAS OF SEAS APPROACHING
5 FT.
THURSDAY NIGHT: WINDS LESS THAN 25 KT. SEAS UP TO 5 FT. SLIGHT
CHANCE OF RAIN SHOWERS.
FRIDAY: WINDS LESS THAN 25 KT. SEAS UP TO 5 FT. SLIGHT CHANCE
OF RAIN SHOWERS, SLIGHT CHANCE OF THUNDERSTORMS.
BOX WATCHES/WARNINGS/ADVISORIES
CT...FLOOD WATCH FROM 2 AM EDT MONDAY THROUGH TUESDAY AFTERNOON FOR
CTZ002>004.
MA...FLOOD WATCH FROM 2 AM EDT MONDAY THROUGH TUESDAY AFTERNOON FOR
MAZ020.
RI...FLOOD WATCH FROM 2 AM EDT MONDAY THROUGH TUESDAY AFTERNOON FOR
RIZ001>008.
MARINE...NONE.
DISCUSSION...LEGRO
AVIATION...BOATMAN
MARINE...BOATMAN
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