843
FXUS61 KOKX 130800
AFDOKX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW YORK NY
400 AM EDT SAT SEP 13 2025
SYNOPSIS
HIGH PRESSURE OVER THE AREA GRADUALLY WEAKENS THIS WEEKEND
WHILE SLOWLY MOVING OFFSHORE. A WEAK COLD FRONT APPROACHES
SUNDAY AND MOVES ACROSS SUNDAY NIGHT. A NEW AREA OF HIGH
PRESSURE THEN BUILDS IN FROM THE NORTH AND WEST FOR EARLY NEXT
WEEK. A WEAK LOW TO THE SOUTH MAY GRAZE THE AREA WEDNESDAY
NIGHT INTO THURSDAY, FOLLOWED BY WEAK HIGH PRESSURE ON FRIDAY.
NEAR TERM /UNTIL 6 PM THIS EVENING/
INTO THE MORNING HOURS, STRATUS MORE PREVALENT ACROSS WESTERN AREAS.
FOR EASTERN AREAS, PATCHY FOG FOR LOCATIONS REACHING SATURATION,
PARTICULARLY INLAND AND RURAL VALLEY SECTIONS.
DURING THE DAY, SYNOPTIC SOUTHERLY FLOW FROM HIGH PRESSURE MOVING
OFFSHORE BUT OVERALL WEAKENING. A LITTLE BIT OF CONVERGENCE WITH SEA
BREEZE ENHANCEMENT AND SOME POSITIVE VORTICITY ADVECTION ALOFT WILL
ENABLE FOR A FEW RAIN SHOWERS TO DEVELOP. MODEL CAPE LIMITED TO NEAR
100 J/KG OR LESS, SO LEFT OUT THUNDER. THE SPARSE COVERAGE OF
SHOWERS FORECAST AS DENOTED FROM A FEW CAMS LIMITED POPS TO SLIGHT
CHANCE. SOME LOCATIONS DUE TO AMBIENT DRIER LOW LEVELS MAY END UP
JUST GETTING SOME SPRINKLES.
FORECAST HIGH TEMPERATURES RANGE FROM THE LOWER 70S FOR EASTERN
COASTLINE TO LOWER 80S FOR PARTS OF INTERIOR NORTH AND WEST OF NYC.
THESE VALUES ARE FROM NBM. THE NBM HIGH TEMPERATURES NEAR THE COAST
SEEM TO BE IN GENERAL AGREEMENT WITH A CONSENSUS OF MOS BUT ARE A
FEW DEGREES HIGHER FOR URBAN AND INTERIOR AREAS.
SHORT TERM /6 PM THIS EVENING THROUGH MONDAY NIGHT/
FOR TONIGHT, THE LOSS OF DIURNAL HEATING WILL MAKE FOR LESSENING
INSTABILITY. ANY REMAINING SHOWERS ARE EXPECTED TO DISSIPATE.
OTHERWISE, WEAKENING HIGH PRESSURE WILL ALLOW FOR A DRY AIRMASS WITH
SOUTHERLY LIGHT WINDS BECOMING MORE VARIABLE. PATCHY FOG WILL BE
POSSIBLE LATE AT NIGHT INTO EARLY SUNDAY MORNING FOR THOSE LOCATIONS
THAT RADIATIVELY COOL MORE, MOSTLY ACROSS THE INTERIOR WHERE WINDS
BECOME NEARLY CALM.
FORECAST LOWS TONIGHT ARE MAINLY IN THE UPPER 50S TO LOWER 60S.
WEAKENING HIGH PRESSURE WILL ALLOW FOR A WEAK COLD FRONT TO
APPROACH THE REGION SUNDAY. THIS WEAK COLD FRONT WILL MOVE
ACROSS THE REGION SUNDAY NIGHT.
MORE LOW LEVEL WARM AIR ADVECTION EXPECTED FOR SUNDAY, ALLOWING FOR
WARMER SURFACE TEMPERATURES. THESE WILL BE SEVERAL DEGREES WARMER
THAN THE PREVIOUS DAY. FORECAST HIGH TEMPERATURES RANGE FROM THE MID
70S TO MID 80S.
MODELS CONVEY STRONGER SHORTWAVE ENERGY ALOFT AS DIAGNOSED FROM
MORE POSITIVE VORTICITY ADVECTION ALONG WITH MORE INSTABILITY
(MORE BETWEEN 100 AND 200 J/KG CAPE) WILL PRESENT A POSSIBILITY
FOR SHOWERS AND THUNDERSTORMS. THE FRONT WITH ITS WEAKENING
STRUCTURE AND LIMITED MOISTURE CONTENT WILL HAVE ASSOCIATED
CONVECTIVE COVERAGE LIMITED TO NO MORE THAN SPARSE. THE POPS AS
A RESULT ARE MOSTLY SLIGHT CHANCE TO LOW END CHANCE WITH LOW END
CHANCE ACROSS NORTH AND EASTERN PORTIONS OF NEW LONDON CT. THE
CAMS DEPICT SPARSE CONVECTION DEVELOPING DURING THE AFTERNOON,
MOSTLY ACROSS THE INTERIOR.
POST COLD FRONT, TEMPERATURES TREND DOWN SLIGHTLY AS WINDS
TRANSITION TO MORE NORTHERLY AND EVENTUALLY MORE EASTERLY. DRY
CONDITIONS WILL REMAIN THEREAFTER THROUGH MONDAY NIGHT. LOWS
FORECAST SUNDAY NIGHT RANGE FROM THE LOWER 50S TO MID 60S. FORECAST
HIGHS ON MONDAY RETURN TO A LOWER 70S TO LOWER 80S RANGE. LOWS
FORECAST MONDAY NIGHT RANGE MAINLY FROM MID 50S TO LOWER 60S.
LONG TERM /TUESDAY THROUGH FRIDAY/
KEY POINTS:
* DRY CONDITIONS WITH SEASONABLE TEMPERATURES ARE FORECAST THROUGH
WEDNESDAY AFTERNOON.
* A WEAK LOW TO THE SOUTH MAY GRAZE THE AREA WEDNESDAY NIGHT INTO
THURSDAY.
* DRY AND WARMER CONDITIONS ARE POSSIBLE FOR FRIDAY.
RIDGING WILL CONTINUE TO BUILD OVER MUCH OF THE EASTERN CONUS MONDAY
AND TUESDAY. THE MODELING STILL INDICATES ENERGY GETTING STUCK
UNDERNEATH THE RIDGE ACROSS THE SOUTHEAST, LIKELY FORMING A BROAD
CUTOFF LOW BY MID WEEK. THE UNCERTAINTY LIES WITH ITS LOCATION BY
LATER THIS WEEK, WITH THE GFS FASTER (WED NIGHT-THU) AND ECMWF
SLOWER (THU-THU NIGHT). NBM GUIDANCE SIDES WITH THE FAST GFS IDEA.
AFTER THIS LOW PULLS AWAY, WEAK SFC RIDGING SHOULD RETURN WITH ABOVE
NORMAL TEMPS FOR FRI.
AVIATION /08Z SATURDAY THROUGH WEDNESDAY/
HIGH PRESSURE OVER THE AREA WILL SHIFT JUST OFFSHORE TODAY. A
WEAKENING COLD FRONT WILL APPROACH FROM THE NORTHWEST THIS
AFTERNOON.
AT 07Z PATCHY MVFR CIGS WERE NEAR KLGA/KISP/KHPN/KBDR ATTM, WITH
EVEN LOWER IFR CIGS JUST NE OF KHPN. CAN'T RULE OUT EXPANSION OF
THESE PATCHY CIGS SW TO THE OTHER NYC METRO TERMINALS OVERNIGHT INTO
PART OF THE AM PUSH SO THIS WILL HAVE TO BE WATCHED CLOSELY.
DAYTIME SAT SHOULD SEE VFR COND WITH SOME BKN MID LEVEL CIGS
DEVELOPING IN THE AFTERNOON. CAN'T RULE OUT A STRAY LATE MID TO LATE
AFTERNOON SHOWER IN SPOTS, MAINLY NEAR KSWF/KHPN/KBDR.
LIGHT WINDS OVERNIGHT SHOULD BECOME MAINLY SSE-S 5-10 KT DURING THE
LATE MORNING AND AFTERNOON, EXCEPT AT KSWF WHERE LIGHT WSW FLOW
EXPECTED.
...NY METRO (KEWR/KLGA/KJFK/KTEB) TAF UNCERTAINTY...
MAY HAVE TO WATCH FOR POSSIBLE TEMPO MVFR CIGS BEFORE 13Z-14Z.
OUTLOOK FOR 06Z SUNDAY THROUGH WEDNESDAY
LATE TONIGHT: VFR.
SUNDAY: MAINLY VFR, SLIGHT CHANCE OF AN AFTERNOON SHOWER OR TSTM AS
ANOTHER WEAK COLD FRONT APPROACHES.
SUNDAY NIGHT THROUGH WEDNESDAY: VFR.
DETAILED INFORMATION, INCLUDING HOURLY TAF WIND COMPONENT FORECASTS,
CAN BE FOUND AT: HTTPS:/WWW.WEATHER.GOV/ZNY/N90
MARINE
WITH HIGH PRESSURE STAYING NEARBY AND WEAKENING, PRESSURE GRADIENT
WILL BE WEAKENING ALSO. WINDS AND SEAS ARE FORECAST TO REMAIN WELL
BELOW SCA THRESHOLDS THROUGH EARLY NEXT WEEK.
WEAK PRESSURE GRADIENT REMAINS WITH WEAK LOW PRESSURE
APPROACHING NEARBY POTENTIALLY FOR MIDDLE OF NEXT WEEK, SO
CONDITIONS LOOK TO STAY BELOW SCA THRESHOLDS.
HYDROLOGY
THERE ARE NO HYDROLOGIC CONCERNS THROUGH NEXT WEEK.
TIDES/COASTAL FLOODING
RIP CURRENT RISK FOR OCEAN BEACHES THIS WEEKEND IS LOW WITH
WINDS STAYING LIGHT AND LESS ONSHORE SWELL. SOUTHERLY WINDS STAY
MOSTLY IN 5-10 KT RANGE AND WAVES STAY NEAR 2-3 FT.
OKX WATCHES/WARNINGS/ADVISORIES
CT...NONE.
NY...NONE.
NJ...NONE.
MARINE...NONE.
SYNOPSIS...JM
NEAR TERM...JM
SHORT TERM...JM
LONG TERM...BG
AVIATION...BG
MARINE...BG/JM
HYDROLOGY...BG/JM
TIDES/COASTAL FLOODING...
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