677
FXUS61 KBOX 080704
AFDBOX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOSTON/NORTON MA
304 AM EDT FRI AUG 8 2025
SYNOPSIS
HIGH PRESSURE WILL BRING WARM DAYS AND COMFORTABLY COOL NIGHTS
THROUGH SATURDAY. WARMING TREND SUNDAY WITH SOME 90 DEGREE TEMPS IN
THE INTERIOR, THEN AN EXTENDED PERIOD OF HEAT WITH MODERATE HUMIDITY
LEVELS IS LIKELY FOR MUCH OF NEXT WEEK, ESPECIALLY AWAY FROM THE
SOUTH COAST. A DRY PATTERN OVERALL IS EXPECTED WITH INCREASING
CHANCES FOR AFTERNOON SHOWERS OR STORMS LATER IN THE WEEK.
NEAR TERM /UNTIL 6 PM THIS EVENING/
KEY MESSAGES:
* DRY AND SEASONABLY WARM WITH LOW HUMIDITY
HIGH PRES IN CONTROL ACROSS NEW ENG WILL BRING ANOTHER SPECTACULAR
SUMMER DAY WITH SUNSHINE, WARM TEMPS, LIGHT WINDS AND LOW HUMIDITY.
ANY CONVECTION WILL BE CONFINED TO NORTHERN NEW ENG WHERE BETTER
MOISTURE AND INSTABILITY RESIDES. NOT MUCH CHANGE IN LOW LEVEL TEMPS
SO EXPECT HIGHS IN THE LOWER 80S, EXCEPT UPPER 70S ALONG THE
IMMEDIATE COAST WHERE SEA-BREEZES DEVELOP. DEWPOINTS AT MAX HEATING
WILL DROP INTO THE UPPER 40S AND LOWER 50S SO HUMIDITY LEVELS WILL
BE LOW.
SHORT TERM /6 PM THIS EVENING THROUGH 6 PM SATURDAY/
KEY MESSAGES:
* DRY AND COMFORTABLY COOL TONIGHT
* SEASONABLY WARM WITH LOW HUMIDITY SATURDAY
NO CHANGE IN THE PATTERN WITH HIGH PRES REMAINING IN CONTROL AS
UPPER RIDGE BUILDS EAST FROM THE GT LAKES. GOOD RADIATIONAL COOLING
TONIGHT UNDER CLEAR SKIES AND LIGHT-CALM WINDS WILL RESULT IN LOWS
IN THE 50S WITH SOME UPPER 40S IN LOW-LYING AREAS WHERE PATCHY FOG
IS POSSIBLE. THEN NICE RECOVERY SATURDAY UNDER FULL SUNSHINE AND
SLIGHT WARMING ALOFT WILL RESULT IN HIGHS IN THE LOW-MID 80S, WITH
UPPER 70S ALONG THE IMMEDIATE COAST AS SEA-BREEZES DEVELOP AGAIN.
LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/
KEY MESSAGES:
* EXTENDED PERIOD OF HEAT THROUGH MUCH OF NEXT WEEK WITH MODERATE
HUMIDITY LEVELS
* A FEW SHOWERS OR T-STORMS POSSIBLE MID-LATE WEEK, BUT DRY PATTERN
OVERALL
UPPER LEVEL RIDGE BUILDING OVER THE NE WITH PERSISTENT SURFACE HIGH
PRES IN THE WESTERN ATLC WILL RESULT IN AN EXTENDED PERIOD OF HEAT
WHICH MAY LAST THROUGH THE UPCOMING WEEK. BUT CONFIDENCE DECREASES
LATE IN THE WEEK GIVEN SPREAD AMONG DETERMINISTIC GUIDANCE REGARDING
WHETHER THE RIDGE WILL BREAK DOWN. THE HEAT BEGINS ON SUNDAY IN THE
INTERIOR WHERE 90 DEGREE TEMPS POSSIBLE, THEN MORE WIDESPREAD TEMPS
INTO THE 90S FOR MUCH OF NEXT WEEK. HIGH CONFIDENCE THROUGH WED THEN
DECREASING CONFIDENCE.
NBM IS SHOWING 60-85% PROBS OF 90+ NEXT WEEK AWAY FROM THE SOUTH
COAST. THE WORST OF THE HEAT IS EXPECTED IN THE INTERIOR AS DAILY
SEA-BREEZES MAY TEMPER THE HEAT SOMEWHAT NEAR THE COAST, ESPECIALLY
SOUTH COAST. IT APPEARS HUMIDITY LEVELS WILL BE MODERATE THROUGH AT
LEAST TUE AND POSSIBLY WED WITH DEWPOINTS MOSTLY IN THE LOW-MID 60S
WHICH WOULD KEEP HEAT INDICES A BIT BELOW DANGEROUS THRESHOLDS. THE
LOWER DEWPOINTS WILL ALSO ALLOW OVERNIGHT LOW TEMPS TO FALL INTO THE
60S THROUGH MID WEEK. THE PROBABILITY OF DEWPOINTS APPROACHING 70
INCREASES WED AND ESPECIALLY THU AS HIGHER PWATS DEVELOP.
DRY WEATHER EXPECTED THROUGH AT LEAST TUE WITH SUBSIDENCE AND
LIMITED INSTABILITY IN PLACE. WHILE MOISTURE AND INSTABILITY
INCREASES LATER WED-THU, SYNOPTIC FORCING REMAINS WEAK. RISK FOR
DIURNAL SHOWERS/T-STORMS WILL INCREASE SOMEWHAT WED AND ESPECIALLY
THU AS INSTABILITY INCREASES.
AVIATION /07Z FRIDAY THROUGH TUESDAY/
FORECASTER CONFIDENCE LEVELS...
LOW - LESS THAN 30 PERCENT.
MODERATE - 30 TO 60 PERCENT.
HIGH - GREATER THAN 60 PERCENT.
06Z TAF UPDATE:
TODAY THROUGH SATURDAY...HIGH CONFIDENCE.
VFR. PATCHY FOG POSSIBLE OVERNIGHT IN LOW LYING AREAS. SE WIND
5-10 KT TODAY AND SAT, LIGHT TO CALM WIND TONIGHT.
KBOS TERMINAL...HIGH CONFIDENCE IN TAF. SEA-BREEZE DEVELOPING
14-15Z.
KBDL TERMINAL...HIGH CONFIDENCE IN TAF.
OUTLOOK /SATURDAY NIGHT THROUGH TUESDAY/...
VFR.
MARINE
FORECASTER CONFIDENCE LEVELS...
LOW - LESS THAN 30 PERCENT.
MEDIUM - 30 TO 60 PERCENT.
HIGH - GREATER THAN 60 PERCENT.
THROUGH SATURDAY...HIGH CONFIDENCE.
TRANQUIL BOATING CONDITIONS EXPECTED TO CONTINUE THROUGH SAT WITH E-
SE WINDS 15 KT OR LESS. SEAS 3 FT OR LESS ALL WATERS.
OUTLOOK /SATURDAY NIGHT THROUGH TUESDAY/...
SATURDAY NIGHT THROUGH SUNDAY: WINDS LESS THAN 25 KT.
SUNDAY NIGHT: WINDS LESS THAN 25 KT. SEAS LOCALLY APPROACHING
5 FT.
MONDAY THROUGH MONDAY NIGHT: WINDS LESS THAN 25 KT. AREAS OF
SEAS APPROACHING 5 FT.
TUESDAY: WINDS LESS THAN 25 KT.
BOX WATCHES/WARNINGS/ADVISORIES
CT...NONE.
MA...NONE.
RI...NONE.
MARINE...NONE.
SYNOPSIS...KJC
NEAR TERM...KJC
SHORT TERM...KJC
LONG TERM...KJC
AVIATION...KJC
MARINE...KJC
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