873  
FXUS61 KOKX 260534  
AFDOKX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE NEW YORK NY  
134 AM EDT TUE MAY 26 2015  
   
SYNOPSIS
 
 
A BERMUDA HIGH REMAINS IN PLACE THROUGH THE END OF THE WEEK WITH  
A WEAKENING FRONTAL BOUNDARY DISSIPATING ACROSS THE AREA ON  
THURSDAY. A STRONGER COLD FRONT SHOULD CROSS THE AREA  
SUNDAY...THEN STALL OUT TO THE SOUTH EARLY NEXT WEEK.  
 

 
   
NEAR TERM /UNTIL 6 AM THIS MORNING/
 
 
MADE MINOR CHANGES TO REFLECT THE LATEST TRENDS IN OBSERVATIONS  
AND GUIDANCE. THE FORECAST APPEARS ON TRACK.  
 
OTHERWISE...DRY CONDITIONS WITH SOUTHERLY FLOW DECREASING  
TONIGHT. NOT ANTICIPATING ANY FOG/STRATUS TONIGHT...ALTHOUGH  
WOULD NOT BE SURPRISED IF A FEW LOW CLOUDS ARE FLOATING AROUND  
TOWARDS MORNING.  
 
USED A BLEND OF MAV/MET/ECS MOS FOR LOWS TONIGHT IN THE MID 60S  
IN/AROUND NYC AND IN THE UPPER 50S TO LOW 60S ELSEWHERE.  
 

 
   
SHORT TERM /6 AM THIS MORNING THROUGH 6 PM WEDNESDAY/
 
 
BERMUDA HIGH CONTINUES TO IMPACT THE REGION ON TUESDAY WITH  
INCREASING S-SW WINDS THROUGH THE AFTERNOON. THIS WILL CONTINUE TO  
USHER A WARM AND INCREASINGLY HUMID AIRMASS INTO THE REGION WITH  
HIGHS GENERALLY IN THE LOW TO MID 80S IN/AROUND NYC...AREAS MAINLY  
WEST OF THE HUDSON RIVER...AND ACROSS INTERIOR PORTIONS OF  
SOUTHERN CT. MOST OTHER AREAS WILL TOP OFF IN THE LOW 80S...WHILE  
LONG ISLAND AND COASTAL CT WILL TOP OFF IN THE MID TO UPPER 70S.  
IMMEDIATE COASTAL AREAS RIGHT ALONG THE SHORE WILL STRUGGLE TO  
WARM ABOVE THE LOWER 70S DUE TO THE ONSHORE FLOW AND WATER TEMPS  
STILL IN THE 50S.  
 
WEAK MID-LEVEL SHORTWAVE WILL PASS TO THE NORTH OF THE REGION  
TUESDAY AFTERNOON/EVENING. WITH FORECASTED CAPE VALUES OVER 1500  
J/KG ACROSS THE INTERIOR...AND A STEEPENING LAPSE RATE...CAN  
EXPECT AT LEAST SOME SCT SHOWERS/TSTMS IN AFTERNOON/EVENING.  
MODELS ALSO INDICATING SOME PRECIPITATION IN THE AFTERNOON/EVENING FOR  
THE LOWER HUDSON VALLEY. WILL CAP POPS AT CHANCE...AS ACTIVITY  
SHOULD NOT BE WIDESPREAD. WILL NOT MENTION SHOWERS/TSTMS FOR  
COASTAL AREAS AS SEA BREEZES SHOULD HAVE A STABILIZING EFFECT ON  
THE AREA...AND ANY STORMS THAT POP UP WILL NOT BE ABLE TO LAST IN  
THAT ENVIRONMENT.  
 
SOME FOG/STRATUS POSSIBLE STARTING TUESDAY NIGHT DUE TO THE  
PERSISTENT INCREASE IN LOW-LEVEL MOISTURE...ESPECIALLY FOR COASTAL  
AREAS. WILL INTRODUCE PATCHY FOG IN THE FORECAST.  
 
NAM/GFS/ECMWF ALSO SHOWING ANOTHER SHORTWAVE PASSING THROUGH THE  
AREA SOMETIME AFTER MIDNIGHT TUESDAY NIGHT AND THROUGH WEDNESDAY  
MORNING. HARD TO TELL EXACTLY WHERE THE CONVECTION WOULD SET  
UP...BUT WILL GO AHEAD AND INTRODUCE CHANCE POPS FOR SHOWERS/TSTMS  
LATE TUESDAY NIGHT.  
 
THERE IS A MODERATE RISK FOR RIP CURRENT DEVELOPMENT AT ATLANTIC  
OCEAN BEACHES ON TUESDAY.  
 

 
   
LONG TERM /WEDNESDAY NIGHT THROUGH MONDAY/
 
 
A HIGH AMPLITUDE RIDGE ALONG THE EASTERN SEABOARD WILL EXPAND  
WESTWARD BACK TO THE MS RIVER VALLEY AS SHORT WAVE ENERGY OVER THE  
GREAT LAKES DAMPENS AND LIFTS TO THE NE WED INTO THU. THIS WILL  
ALLOW THE SUB TROPICAL RIDGE...BERMUDA HIGH...TO REMAIN IN PLACE  
THROUGH NEXT WEEKEND...PUMPING IN WARM...HUMID AIR ACROSS THE  
REGION.  
 
THE ONLY FORECAST DILEMMA IS WITH THE TIMING OF A COLD FRONT LATE  
NEXT WEEKEND MOVING INTO THE REGION. THE 12Z OPERATIONAL GFS IS  
THE FASTEST...AND MOST AGGRESSIVE SOLUTION. HOWEVER...DEFERRED TO  
THE SLOWER ECMWF WHICH HAS SUPPORT FROM THE GEFS.  
 
AS FOR CONVECTION...THE HIGHEST PROBABILITIES WILL BE ACROSS THE  
INTERIOR WHERE THE AIRMASS CAN DESTABILIZE THE MOST. MOST OF THE  
ACTIVITY IS EXPECTED TO BE DIURNAL IN NATURE OUTSIDE OF ANY WEAK  
SHORT WAVE ENERGY ABLE TO SUSTAIN CONVECTION INTO THE NIGHTTIME  
HOURS. THIS WILL BE A MODERATE CAPE ENVIRONMENT...BUT WEAKLY  
SHEARED. STEERING FLOW BECOMES LIGHT ALOFT AT THE END OF THE WEEK.  
THUS...LOCALIZED HEAVY RAINFALL WILL BE A POSSIBILITY AS WELL.  
 
POTENTIAL FOR A MORE ORGANIZED RAINFALL EVENT LATE NEXT WEEKEND  
AS COLD FRONT MOVES INTO THE AREA.  
 
CONDITIONS WILL REMAIN UNSEASONABLY WARM BY ABOUT 5 TO 10  
DEGREES.  
 

 
   
AVIATION /06Z TUESDAY THROUGH SATURDAY/
 
 
HIGH PRESSURE REMAINS EAST OF THE AREA FOR THE NEXT SEVERAL DAYS.  
 
VFR THROUGH MUCH TAF PERIOD. THERE IS A CHANCE OF THUNDERSTORMS  
NORTH AND WEST OF NYC TUESDAY AFTERNOON. WILL INCLUDE A PROB30  
GROUP FOR THIS AT KSWF. ANY THUNDERSTORMS COULD PRODUCE BRIEF  
SUB-VFR CONDITIONS.  
 
WIND SOUTH TO SOUTHWEST INCREASES TUESDAY MORNING TO 10 TO 15 KT AND  
BY AFTERNOON WIND MAY BE 15 TO 20 KT SUSTAINED WITH GUSTS 20 TO 25  
KT.  
   
OUTLOOK FOR 06Z WEDNESDAY THROUGH SATURDAY
 
   
TUESDAY NIGHT
 
THERE IS A LOW CHANCE OF SOME MVFR STRATUS ALONG  
THE IMMEDIATE COAST OF LONG ISLAND.  
   
WEDNESDAY
 
LOW CHANCE OF EARLY MORNING MVFR STRATUS. LOW CHANCE  
OF AFTERNOON AND EARLY EVENING SHRA/TSTM...MAINLY NORTH AND WEST OF  
THE NYC METRO TERMINALS. SOUTHERLY WIND GUSTS UP TO 25 KT.  
   
THURSDAY-SATURDAY
 
THIS IS A CHANCE OF LATE NIGHT AND EARLY  
MORNING MVFR OR LOWER STRATUS AND/OR FOG. THERE IS A LOW CHANCE OF  
AFTERNOON AND EVENING SHRA/TSTM. WIND GUSTS 20-25 KT.  
 

 
   
MARINE
 
 
MADE MINOR CHANGES TO REFLECT THE LATEST TRENDS IN OBSERVATIONS  
AND GUIDANCE. THE FORECAST APPEARS ON TRACK.  
 
WIND GUSTS HAVE FALLEN BELOW 25 KT AT 44069 SO HAVE CANCELLED THE  
SCA FOR THE SOUTH SHORE BAYS OF LONG ISLAND.  
 
NO CHANGES TO THE SCA ON THE OCEAN WATERS. SEAS WILL BUILD TO 5  
FT TONIGHT AND SHOULD REMAIN ABOVE 5 FT THROUGH AT LEAST TUESDAY  
NIGHT. WINDS MAY DIMINISH BELOW SCA LEVELS LATE TONIGHT THROUGH  
TUESDAY MORNING...BUT WITH THE INCREASED SEAS...WILL GO AHEAD AND  
CARRY THE SCA THROUGH WEDNESDAY MORNING.  
 
SCT SHOWERS/TSTMS POSSIBLE TUESDAY NIGHT. AREAS OF FOG WILL  
DEVELOP TUESDAY NIGHT AS WELL...POSSIBLY REDUCING VSBY TO LESS  
THAN 1 NM.  
 
ROUGH SEAS ARE LIKELY TO CONTINUE THROUGH THE END OF THE DUE TO A  
PERSISTENT SLY AROUND THE WESTERN PERIPHERY OF THE SUB TROPICAL RIDGE.  
 
FOG WILL BECOME MORE LIKELY THROUGH THE WEEK...ESPECIALLY AT NIGHT  
AND INTO THE EARLY MORNING.  
 

 
   
HYDROLOGY
 
 
SCT SHOWERS/TSTMS POSSIBLE TUESDAY NIGHT THROUGH WEDNESDAY  
MORNING...AND ANY TRAINING OF CELLS COULD RESULT IN MINOR  
URBAN/SMALL STREAM FLOODING.  
 
THERE IS POTENTIAL FOR A MORE ORGANIZED RAINFALL EVENT LATE NEXT  
WEEKEND AS COLD FRONT MOVES INTO THE AREA.  
 

 
   
OKX WATCHES/WARNINGS/ADVISORIES
 
 
CT...NONE.  
NY...NONE.  
NJ...NONE.  
MARINE...SMALL CRAFT ADVISORY UNTIL 6 AM EDT WEDNESDAY FOR ANZ350-353-  
355.  
 

 
 

 
SYNOPSIS...JC/MPS  
NEAR TERM...MALOIT/MPS  
SHORT TERM...MPS  
LONG TERM...DW  
AVIATION...BC  
MARINE...MALOIT/MPS/DW  
HYDROLOGY...MPS/DW  
 
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