164  
FXUS61 KOKX 242350  
AFDOKX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE NEW YORK NY  
750 PM EDT FRI SEP 24 2021  
   
SYNOPSIS
 
 
A STATIONARY FRONT WILL REMAIN TO THE EAST THROUGH THE WEEKEND.  
WEAK LOW PRESSURE DEVELOPING ALONG THE FRONT WILL PASS TO THE  
SOUTHEAST SATURDAY NIGHT. HIGH PRESSURE OVER THE AREA SUNDAY  
AND MONDAY WILL GIVE WAY TO A WEAK COLD FRONT MOVING THROUGH ON  
TUESDAY. HIGH PRESSURE WILL THEN MOVE IN TO THE NORTH AS THE  
FRONT STALLS TO THE SOUTH. LOW PRESSURE MAY DEVELOP TO THE SOUTH  
BY THE END OF THE WEEK.  
 

 
   
NEAR TERM /UNTIL 6 AM SATURDAY MORNING/
 
 
FORECAST REMAINS ON TRACK WITH THIS UPDATE ACCOUNTING FOR  
OBSERVATIONS OF TEMPERATURE, DEW POINT AND SKY COVER. ONLY A  
FEW ISOLATED SHOWERS REMAIN IN THE AREA.  
 
SOUTHERN ONTARIO CLOSED LOW LIFTS TOWARDS HUDSON BAY TONIGHT,  
WHILE SHEARED OUT VORT AXIS REMAIN TO THE WEST AND JUST TO THE  
EAST WITHIN A LARGE LONGWAVE TROUGH ACROSS EASTERN CONUS. AT THE  
SURFACE, HIGH PRESSURE BUILDS INTO WESTERN PORTIONS OF THE  
REGION, WHILE A COLD FRONT STALL JUST E OF SE NEW ENGLAND.  
 
WITH THE FRONTAL BOUNDARY STILL VERY CLOSE TO THE REGION AND  
SHEARED OUT VORT AXIS JUST TO THE WEST AND EAST OF THE REGION,  
THE THREAT FOR ISOLATED SHOWERS WILL LINGER TONIGHT ACROSS FAR  
EASTERN LONG ISLAND AND SOUTHEAST CONNECTICUT. MEANWHILE TO THE  
WEST, PARTICULARLY NYC METRO, NJ, AND LOWER HUD, SW CT AND W  
LONG ISLAND, CLEAR SKIES WILL PREVAIL UNDER HIGH PRESSURE. THIS  
WILL BRING GOOD RADIATIONAL COOLING CONDITIONS OUTSIDE THE  
URBAN CENTERS, WITH LOWS FALLING INTO THE 40S. GENERALLY 50S TO  
NEAR 60S FOR FAR EASTERN AREAS WITH CLOUD COVER AND  
COASTAL/URBAN CENTERS.  
 

 
   
SHORT TERM /6 AM SATURDAY MORNING THROUGH SATURDAY NIGHT/
 
 
FAIRLY GOOD MODEL AGREEMENT WITH THE NEXT CLOSED UPPER LOW  
DIGGING TOWARDS THE GREAT LAKES ON SAT, WITH LONGWAVE TROUGH  
AXIS EXTENDING DOWN TO THE GULF COAST. THIS AXIS NEGATIVELY  
TILTS TOWARDS THE NE US SAT NIGHT/SUNDAY AS THE CLOSED UPPER  
LOW ROUNDS THE BASE OF HUDSON BAY THIS WEEKEND.  
 
AT THE SURFACE, A STATIONARY FRONT REMAINS NEAR SE MA, WHILE  
HIGH PRESSURE OVER WESTERN PORTIONS OF THE REGION GRADUALLY  
WEAKENS. AS THE UPPER TROUGH AXIS PIVOTS TOWARDS THE EAST COAST  
SAT NIGHT, MODELS SIGNALING A FRONTAL WAVE RIDING NE FROM CAPE  
HATTERAS ON SAT AND TRACKING SE OF LONG ISLAND ON SAT NIGHT. AT  
THE SAME TIME, A WEAKENING COLD FRONT APPROACHES WESTERN  
PORTIONS OF THE REGION SAT NIGHT.  
 
A CONTINUATION OF TODAYS PATTERN FOR SENSIBLE WEATHER SAT, WITH  
THE FRONTAL BOUNDARY STILL CLOSE TO EASTERN PORTIONS OF THE  
REGION AND SHEARED OUT VORT AXIS TO THE EAST OF THE REGION,  
LINGERING THE THREAT FOR ISOLATED SHOWERS SAT INTO SAT NIGHT  
ACROSS FAR EASTERN LONG ISLAND AND SOUTHEAST CONNECTICUT. IN  
FACT, POTENTIAL FOR A BIT MORE WIDESPREAD SHOWER ACTIVITY ACROSS  
E LONG ISLAND/SE CT SAT NIGHT WITH THE EARLIER MENTIONED  
FRONTAL WAVE. QUITE A BIT OF SPREAD ON THIS THOUGH, SO ONLY LOW-  
MODERATE CONFIDENCE IN SHOWER POTENTIAL. INDICATION ARE THAT ANY  
TOTAL RAINFALL AMOUNTS WOULD BE LIGHT.  
 
MEANWHILE TO THE WEST, PARTICULARLY NYC METRO, NE NJ, LOWER  
HUD, SW CT AND W LONG ISLAND, CLEAR/MOSTLY SUNNY SKIES WILL  
PREVAIL UNDER WEAKENING HIGH PRESSURE DURING THIS PERIOD.  
 
HIGH TEMPERATURES ON SAT IN THE MID TO UPPER 70S ACROSS WESTERN  
PORTIONS OF THE TRI-STATE TO LOWER 70S FOR EASTERN PORTIONS  
WITH MORE IN THE WAY OF CLOUD COVER. LOWS TEMPS SAT NIGHT  
GENERALLY IN 50S TO AROUND 60 FOR COASTAL AND EASTERN AREAS,  
WHILE POTENTIAL FOR RADIATIONAL COOLING CONDS FOR NW INTERIOR  
AREAS SHOULD ALLOW TEMPS TO DROP IN THE 40S.  
 

 
   
LONG TERM /SUNDAY THROUGH FRIDAY/
 
 
THE LONG-TERM PATTERN IS DOMINATED BY AN UPPER-LEVEL TROUGH  
THAT SITS OVER THE NORTHEAST GETTING REINFORCED BY MID-LEVEL  
DISTURBANCES. THIS WILL RESULT IN A LOW CONFIDENCE AND  
POTENTIALLY UNSETTLED TIMEFRAME.  
 
SURFACE HIGH PRESSURE TO THE SOUTH TAKES HOLD OF THE AREA ON SUNDAY  
AS A SURFACE LOW PRESSURE SYSTEM SPINS WELL TO THE NORTH. MUCH OF  
THE AREA LOOKS DRY AND COMFORTABLE WITH HIGHS IN THE LOW TO MIDDLE  
70S BOTH SUNDAY AND MONDAY. THE SPINNING LOW PRESSURE SYSTEM TO THE  
NORTH SENDS A WEAK COLD FRONT INTO THE AREA FROM THE NW BY TUESDAY.  
THIS COLD FRONT GETS ADDITIONAL ENERGY FROM A MID-LEVEL SHORTWAVE BY  
THE TIME IT MOVES SOUTH OF THE AREA INTO EARLY WEDNESDAY, WHICH MAY  
RESULT IN A WAVE OF LOW PRESSURE DEVELOPING ALONG IT.  
 
IN THE MID-LEVELS, A DEEPENING TROUGH OVER THE AREA GREATLY  
AMPLIFIES A RIDGE OVER THE CENTER OF THE COUNTRY WHICH EXTENDS INTO  
THE HUDSON BAY REGION OF CANADA. A SHORTWAVE DIVES INTO THE AREA  
STRAIGHT FROM THE NORTH WHICH REINFORCES THE TROUGH OVER THE  
NORTHEAST AND PREVENTS THE RIDGE FROM PROGRESSING EASTWARD.  
THIS REINFORCEMENT IN THE MID-LEVELS LIKELY FORCES A LOW  
PRESSURE SYSTEM TO DEVELOP TO THE SOUTH OF THE AREA ALONG THE  
STALLED FRONT. A STRENGTHENING HIGH PRESSURE SYSTEM TO THE NORTH  
FORCES THE LOW PRESSURE TO RETROGRADE BACK WESTWARD INTO THE  
MID-ATLANTIC COAST. THIS FORCES AN ANTICYCLONIC WAVE BREAK OVER  
THE AREA WITH A LARGE CUT-OFF LOW PRESSURE POSITIONED OVER THE  
EAST COAST AND A STRONG HIGH PRESSURE SYSTEM TO THE NORTH. WHILE  
THE EXACT STRENGTH, TIMING, AND PLACEMENT OF THESE FEATURES  
REMAINS UNCERTAIN, ALL GLOBAL MODELS SHOW SOME DEPICTION OF  
THIS.  
 
AS A RESULT OF THIS PATTERN, THERE WILL BE A CHANCE FOR SHOWERS ON  
TUESDAY WITH THE COLD FRONTAL PASSAGE, AND THEN MAINLY ALONG THE  
COAST FROM THE DEVELOPMENT OF A COASTAL LOW FROM THURSDAY AND  
THROUGH THE BEGINNING OF THE WEEKEND. WITH A N/NE FLOW THROUGH MUCH  
OF THE PERIOD, TEMPERATURES WILL BE AT OR SLIGHT BELOW AVERAGE WITH  
HIGHS IN THE MIDDLE 60S TO LOW 70S FOR MUCH OF THE EXTENDED PERIOD.  
 

 
   
AVIATION /00Z SATURDAY THROUGH WEDNESDAY/
 
 
WEAK HIGH PRESSURE WILL BUILD FROM THE WEST THROUGH SAT. WEAK  
OFFSHORE LOW PRESSURE SHOULD PASS WELL OFF THE COAST SAT NIGHT.  
 
VFR. LOWER STRATOCU AND POSSIBLY EVEN SOME SHOWERS OR DRIZZLE  
MAY BACK IN OFF THE WATER OUT EAST LATE DAY (AFFECTING MAINLY  
KGON) AS THE LOW PASSES OFFSHORE.  
 
WINDS BECOMING LIGHT/VRB TONIGHT SHOULD BECOME N-NE DURING THE  
MORNING, THEN SW IN THE AFTERNOON, WITH A MORE SOUTHERLY SEA  
BREEZE COMPONENT AT KJFK/KGON.  
 
...NY METRO (KEWR/KLGA/KJFK/KTEB) TAF UNCERTAINTY...  
 
NO UNSCHEDULED AMD EXPECTED.  
   
OUTLOOK FOR 00S SUNDAY THROUGH WEDNESDAY
 
   
SATURDAY NIGHT THROUGH MONDAY
 
LOW CHANCE OF MVFR CIGS E OF  
THE NYC METROS SAT NIGHT, OTHERWISE VFR.    
TUESDAY
 
POSSIBLE MVFR IN SHOWERS DURING THE AFTERNOON.   
WEDNESDAY
 
VFR.  
 
DETAILED INFORMATION, INCLUDING HOURLY TAF WIND COMPONENT  
FORECASTS, CAN BE FOUND AT: HTTPS:/WWW.WEATHER.GOV/ZNY/N90  
 

 
   
MARINE
 
 
SCA REMAINS IN EFFECT FOR THE OCEAN WATERS E OF FIRE ISLAND  
INLET UNTIL MIDNIGHT DUE TO SLOWLY SUBSIDING 5-FT SE SWELL. SUB-  
SCA CONDITIONS RETURN AFTER MIDNIGHT TONIGHT AND CONTINUE  
THROUGH SAT NIGHT. LONG PERIOD 4-FT SE SWELL MAY WORK INTO THE  
WATERS SAT NIGHT FROM DISTANT SUBTROPICAL STORM TERESA, LOCATED  
N OR BERMUDA.  
 
NEAR SCA CONDITIONS WILL BE POSSIBLE SUNDAY THROUGH TUESDAY  
MORNING WITH SEAS NEAR 5 FEET AND GUSTS NEAR 25 KT. OCEAN SEAS  
COULD ALSO REACH SCA LEVELS BY LATE WEEK.  
 

 
   
HYDROLOGY
 
 
NO HYDROLOGIC IMPACTS EXPECTED ATTM.  
 

 
   
TIDES/COASTAL FLOODING
 
 
EXPECT A MODERATE RIP CURRENT RISK FOR SAT AS SWELLS SUBSIDE TO  
3 FT. THERE IS POTENTIAL FOR A MODERATE TO HIGH RISK ON SUNDAY  
AS LONG PERIOD SE SWELLS COULD BUILD BACK TO 4 FT.  
 

 
   
OKX WATCHES/WARNINGS/ADVISORIES
 
 
CT...NONE.  
NY...HIGH RIP CURRENT RISK UNTIL 8 PM EDT THIS EVENING FOR NYZ075-  
080-081-178-179.  
NJ...NONE.  
MARINE...SMALL CRAFT ADVISORY UNTIL 2 AM EDT SATURDAY FOR ANZ350-353.  
 

 
 

 
SYNOPSIS...NV/MW  
NEAR TERM...NV/MW  
SHORT TERM...NV  
LONG TERM...MW  
AVIATION...BG  
MARINE...NV/MW  
HYDROLOGY...NV/MW  
TIDES/COASTAL FLOODING...NV/MW  
 
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