826  
FXUS61 KOKX 160835  
AFDOKX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE NEW YORK NY  
435 AM EDT WED OCT 16 2019  
   
SYNOPSIS
 
 
A STRONG FRONTAL SYSTEM WILL APPROACH TODAY AS A LOW PRESSURE  
DEVELOPS JUST OFF THE MID ATLANTIC COAST. THIS LOW WILL TRACK  
JUST OFF LONG ISLAND TONIGHT AND CONTINUE NORTHEAST THURSDAY.  
MEANWHILE, HIGH PRESSURE WILL BUILD TO THE WEST AND MOVE OVER  
THE REGION FRIDAY, REMAINING THROUGH THE WEEKEND. ANOTHER  
FRONTAL SYSTEM AFFECTS THE REGION SUNDAY NIGHT THROUGH TUESDAY.  
 

 
   
NEAR TERM /THROUGH TONIGHT/
 
 
TODAY WILL START OUT QUIET BEFORE QUICKLY DETERIORATING AS AN  
AMPLIFYING NORTHERN STREAM TROUGH INTERACTS WITH SOUTHERN STREAM  
ENERGY. THIS WILL CAUSE RAPID DEVELOPMENT OF LOW PRESSURE ALONG  
THE MID-ATLANTIC COAST. STRONG UPPER DYNAMICS AIDED BY THE  
NEGATIVELY TILTED TROUGH, UPPER JET EXIT AND ENTRANCE REGIONS  
AND THERMAL FORCING WILL RESULT IN THE POTENTIAL FOR SEVERAL  
INCHES OF RAINFALL AS THE SECONDARY LOW DEVELOPS. WIDESPREAD  
MODERATE TO LOCALLY HEAVY RAIN WILL PRODUCE A GENERAL 1 TO 3  
INCHES, WITH THE POTENTIAL FOR HIGHER AMOUNTS IN ANY  
CONVECTIVELY ENHANCED BANDS. MUCH OF THIS RAIN WILL FALL IN A 6  
TO 9 HOUR PERIOD FROM LATE AFTERNOON/EARLY EVENING TO AROUND  
MIDNIGHT. IF HIGHER AMOUNTS MATERIALIZE, THERE COULD BE  
LOCALIZED FLOODING, HOWEVER THE PROBABILITY REMAINS LOW WITH THE  
EXCEPTION FOR NE NJ WHERE A FLASH FLOOD WATCH REMAINS IN EFFECT  
BASED ON 6 HOUR GRIDDED FFG.  
 
AHEAD OF THE LOW, A PERIOD OF E/SE WINDS 15 TO 20 MPH WITH GUSTS UP  
TO 30 MPH ARE LIKELY. THEN AS THE SECONDARY LOW DEEPENS, THE  
PRESSURE GRADIENT BETWEEN THE TWO SYSTEMS WILL RESULT IN STRONGER  
NORTHWEST WINDS DEVELOPING OVERNIGHT ESPECIALLY ACROSS THE COAST.  
AFTER COLLABORATION WITH NEIGHBORING OFFICES, HAVE ISSUED A WIND  
ADVISORY FOR EASTERN SUFFOLK COUNTY AND SOUTHERN NEW LONDON  
BEGINNING TONIGHT JUST AHEAD OF THE LOW WHERE WINDS WILL BE  
STRONGEST.  
 
HIGHS WILL BE IN THE 60S TODAY AND IN THE UPPER 40S TO 50 DEGREES  
TONIGHT.  
 

 
   
SHORT TERM /THURSDAY/
 
 
AS THE LOW PULLS AWAY INTO MAINE ON THURSDAY, STRONG CYCLONIC FLOW  
AND COLD POOL INSTABILITY COULD RESULT IN A FEW SHOWERS LINGERING  
THROUGH THE AFTERNOON AND A MOSTLY CLOUDY SKY.  
 
STRONG, GUSTY WINDS WILL PREVAIL ON THURSDAY AND IT IS POSSIBLE THAT  
WIND HEADLINES MAY BE NEEDED WITH LATER FORECASTS. STRONGEST  
WINDS WILL BE ACROSS THE FAR EASTERN ZONES WHERE THE BEST MIXING  
AND LOW LEVEL WINDS WILL BE.  
 
HIGH TEMPERATURES ON THURSDAY WILL BE IN THE 50S TO AROUND 60.  
 

 
   
LONG TERM /THURSDAY NIGHT THROUGH TUESDAY/
 
 
HIGH AMPLITUDE, AND PROGRESSIVE, FLOW WILL CONTINUE THROUGH THE  
EXTENDED PERIOD. ONE TROUGH WITH AN EMBEDDED CLOSED LOW WILL BE  
EXITING THE EAST COAST THURSDAY NIGHT AS A RIDGE BUILDS ACROSS  
THE CENTRAL UNITED STATES AND WELL INTO CENTRAL CANADA. THIS  
RIDGE MOVES THROUGH THE EASTERN STATES, AND OFF THE COAST,  
FRIDAY THROUGH SATURDAY NIGHT. MEANWHILE A SERIES OF SHORTWAVES  
MOVE INTO THE PACIFIC NORTHWEST, WITH A STRONGER WAVE DIGGING A  
TROUGH SATURDAY NIGHT AND SUNDAY. THIS DEEP TROUGH WILL THEN  
AFFECT THE REGION FROM SUNDAY NIGHT INTO TUESDAY.  
 
FOR THURSDAY, STRONG AND GUSTY WINDS WILL PREVAIL IN THE COLD  
ADVECTION AND DEEP CYCLONIC FLOW. HELD OFF ON A WIND ADVISORY AT  
THIS TIME AS WILL BE THE FOURTH PERIOD, WITH LOW CONFIDENCE AS  
SUSTAINED WINDS AND GUSTS WILL BE NEAR ADVISORY LEVELS. ALSO,  
HIGHEST WINDS MOSTLY LIKELY WILL BE ACROSS THE FAR EASTERN ZONES,  
SOUTHEASTERN CONNECTICUT, INTO THE TWIN FORKS OF LONG ISLAND. THIS  
IS WERE BEST MIXING, AND STRONGEST LOW LEVEL WINDS WILL BE. THE GFS  
HAD HIGHER WINDS OF 50 TO 60 KT 900 TO 850 MB, AND THE ECMWF WAS IN  
THE 45 TO 50 KT RANGE.  
 
WITH HIGH PRESSURE OVER THE AREA FRIDAY NIGHT, WINDS WILL DECOUPLE  
WITH NEARLY CLEAR CONDITIONS. THIS WILL BE IDEAL RADIATIONAL COOLING  
AND INLAND AREAS, ESPECIALLY THE LOWER HUDSON VALLEY, WILL SEE LOW  
TEMPERATURES IN THE MID AND UPPER 30S WITH AREAS OF FROST.  
 
A WARM UP BEGINS SATURDAY AND CONTINUES INTO EARLY NEXT WEEK. BY  
SUNDAY TEMPERATURES WILL BE SEVERAL DEGREES ANOMALOUSLY ABOVE  
NORMAL. FOR SUNDAY THROUGH TUESDAY WENT ABOVE GUIDANCE TEMPERATURES.  
 
THERE IS SOME UNCERTAINTY WITH THE TIMING OF THE NEXT SYSTEM SUNDAY  
NIGHT INTO TUESDAY, WITH THE ECMWF DEVELOPING A WAVE ALONG THE  
TRIPLE POINT, AND THE GFS MORE DELAYED WITH ONLY WARM ADVECTION  
FORCING WITH A WARM FRONT DEVELOPING. STARTED TO BRING IN  
PRECIPITATION SUNDAY NIGHT, MORE IN LINE WITH THE ECMWF.  
 

 
   
AVIATION /09Z WEDNESDAY THROUGH SUNDAY/
 
 
***HIGH IMPACT RAIN AND WIND EVENT FROM LATE THIS AFTERNOON INTO  
THURSDAY***  
 
HIGH PRESSURE WILL BUILD OFFSHORE TODAY AS INTENSIFYING LOW  
PRESSURE APPROACHES THE WEST. THE LOW WILL MOVE ACROSS TONIGHT.  
 
CLOUDS WILL GRADUALLY LOWER AND THICKEN THROUGH THE DAY  
TODAY. SOME MVFR CIGS COULD PRECEDE THE RAIN DURING LATE  
MORNING AND EARLY AFTERNOON AT THE NYC METROS, THEN RAIN AND  
MVFR/IFR CONDITIONS SHOULD QUICKLY DEVELOP AFTER 18Z. RAIN WILL  
BE HEAVY AT TIMES. RAIN TAPERS OFF AFTER 4-6Z BUT MVFR CIGS  
AROUND 3000 FT MAY REMAIN THROUGH THE REMAINDER OF THE TAF  
PERIOD.  
 
SE WINDS WILL INCREASE TODAY, WITH GUSTS AT OR ABOVE 30 KT  
LIKELY BY LATE EVENING/TONIGHT. DIRECTION WILL VARY AS THE LOW  
TRACKS OVER AND THROUGH THE AREA. WINDS BECOME WESTERLY BEHIND  
THE SYSTEM LATE TONIGHT, AND REMAIN SO THROUGH THU.  
   
OUTLOOK FOR 06Z THURSDAY THROUGH SUNDAY
 
   
LATE TONIGHT
 
RAIN TAPERS OFF BUT STRONG WINDS CONTINUE.   
THURSDAY
 
POSSIBLE MVFR WITH SHOWERS. W WINDS G30-40KT.   
FRIDAY
 
VFR. NW WINDS G20-25KT.    
SATURDAY
 
VFR.   
SUNDAY
 
VFR.  
 

 
   
MARINE
 
 
A STRONG SYSTEM WILL APPROACH THE WATERS ON WEDNESDAY WITH A COASTAL  
LOW DEVELOPING ACROSS THE WATERS LATE IN THE AFTERNOON/EARLY  
EVENING. THIS WILL BRING SCA CONDITIONS TO THE AREA DURING THE DAY  
ON WEDNESDAY WITH SE GUSTS 25-30 KT. AS THE LOW PULLS AWAY WEDNESDAY  
NIGHT AND THURSDAY WESTERLY GALES WILL BRING GUSTS UP TO 40 KT.  
 
A GALE WARNING CONTINUES THURSDAY FOR ALL WATERS. GALE FORCE GUSTS  
MAY CONTINUE INTO THURSDAY EVENING ON THE NON OCEAN WATERS AND INTO  
LATE THURSDAY NIGHT ON OCEAN WATERS. WITH SOME UNCERTAINTY REGARDING  
THE DIMINISHING TIME OF THE GUSTS, THE GALE WARNING HAS NOT BEEN  
EXTENDED AT THIS TIME.  
 
SCA WIND GUSTS CONTINUE THROUGH FRIDAY ONCE GUSTS FALL BELOW GALE  
LEVELS. OCEAN SEAS ARE ALSO EXPECTED TO BE BELOW SCA LEVELS BY  
FRIDAY NIGHT.  
 
TRANQUIL CONDITIONS REMAIN ON THE WATERS FRIDAY NIGHT INTO THE  
BEGINNING OF NEXT WEEK.  
 

 
   
HYDROLOGY
 
 
A SIGNIFICANT RAINFALL OF 1-3 INCHES IS LIKELY WEDNESDAY AFTERNOON  
INTO WEDNESDAY NIGHT, WITH LOCALIZED SWATHS OF 2-4 INCHES POSSIBLE.  
THE BULK OF THE RAINFALL IS EXPECTED IN A 6-9 HR PERIOD LATE  
WEDNESDAY AFTERNOON THROUGH WEDNESDAY EVENING.  
 
URBAN, POOR DRAINAGE, AND LOW LYING FLOODING IS EXPECTED. THERE IS A  
LOW PROBABILITY OF FLASH FLOODING ALONG A FEW OF THE FAST RESPONDING  
SMALL RIVERS AND STREAMS IN NE NJ AND THE LOWER HUDSON VALLEY IF THE  
HIGHER RAINFALL AMOUNTS ARE REALIZED.  
 
ADDITIONALLY, LOCALIZED FLASH FLOODING WILL ALSO BE AN ISSUE FOR  
COASTAL ROADS IF HEAVIEST RAIN COINCIDES WITH THE WED NIGHT HIGH  
TIDES.  
 

 
   
TIDES/COASTAL FLOODING
 
 
THE SE FETCH ACROSS THE WATERS WILL ENABLE FOR PILING OF WATER TODAY  
INTO TONIGHT. THE WINDS INCREASE TODAY INTO TONIGHT AND EVENTUALLY  
BECOME MORE WESTERLY LATE TONIGHT.  
 
HIGHEST ASTRONOMICAL TIDE IS THIS MORNING. SOME ISOLATED MINOR  
COASTAL FLOODING WILL BE POSSIBLE ACROSS THE SOUTH SHORE BACK BAYS  
AND WESTERN LONG ISLAND SOUND ALONG THE WESTCHESTER AND SW  
CONNECTICUT SHORELINES. WATER LEVELS FOR MINOR THIS MORNING ARE  
ABOUT 1.5 TO 2 FT ABOVE ASTRONOMICAL.  
 
HIGH TIDE CYCLES ARE BETWEEN 9AM AND 12PM ACROSS THE SOUTH SHORE  
BACK BAYS AND BETWEEN 12PM AND 3PM ACROSS THE WESTERN LONG ISLAND  
SOUND.  
 
FOR TONIGHT, ASTRONOMICAL TIDE IS LOWER. HOWEVER, THE SURGE WILL BE  
QUITE MORE THAN THIS MORNING SO THE WATER LEVELS ARE EXPECTED TO BE  
ABOUT 2.5 TO 3 FT ABOVE ASTRONOMICAL, ALLOWING FOR WIDESPREAD MINOR  
COASTAL FLOODING FOR MUCH OF LONG ISLAND SHORELINES AS WELL AS  
WESTCHESTER SHORELINE AND SW CONNECTICUT SHORELINES ALONG THE  
WESTERN LONG ISLAND SOUND. OTHER COASTAL AREAS ARE EXPECTED TO JUST  
TOUCH MINOR COASTAL FLOOD BENCHMARKS AND WILL BE MORE ISOLATED.  
BATTERY NY EXPECTED TO STAY BELOW MINOR COASTAL FLOOD BENCHMARK.  
 
HIGH TIDE CYCLES TONIGHT RUN BETWEEN 9PM TO 12AM FOR SOUTH SHORE  
BAYS, AND 12AM TO 3AM FOR WESTERN LI SOUND, LONG ISLAND SHORELINES,  
AND SE CONNECTICUT.  
 
WITH GUSTY WESTERLY AND MAINLY OFFSHORE FLOW ON THURSDAY, FOR THE  
NEXT HIGH TIDE CYCLE FOR THURSDAY MORNING, NO COASTAL FLOODING IS  
EXPECTED.  
 

 
   
EQUIPMENT
 
 
NYC NOAA WEATHER RADIO STATION KWO35 (162.55 MHZ) REMAINS OFF THE  
AIR.  
 

 
   
OKX WATCHES/WARNINGS/ADVISORIES
 
 
CT...COASTAL FLOOD ADVISORY FROM MIDNIGHT TONIGHT TO 4 AM EDT  
THURSDAY FOR CTZ009-010.  
WIND ADVISORY FROM 10 PM THIS EVENING TO 6 PM EDT THURSDAY FOR  
CTZ012.  
NY...COASTAL FLOOD ADVISORY FROM MIDNIGHT TONIGHT TO 4 AM EDT  
THURSDAY FOR NYZ071.  
COASTAL FLOOD ADVISORY FROM 10 PM THIS EVENING TO 4 AM EDT  
THURSDAY FOR NYZ078>081.  
COASTAL FLOOD ADVISORY FROM 9 PM THIS EVENING TO 1 AM EDT  
THURSDAY FOR NYZ178-179.  
WIND ADVISORY FROM 10 PM THIS EVENING TO 6 PM EDT THURSDAY FOR  
NYZ079-081.  
NJ...FLASH FLOOD WATCH FROM 4 PM EDT THIS AFTERNOON THROUGH LATE  
TONIGHT FOR NJZ002-004-006-103>108.  
MARINE...SMALL CRAFT ADVISORY UNTIL 6 PM EDT THIS EVENING FOR ANZ330-  
335-338-340-345-350-353-355.  
GALE WARNING FROM 6 PM THIS EVENING TO 6 PM EDT THURSDAY FOR  
ANZ330-335-338-340-345-350-353-355.  
 

 
 

 
SYNOPSIS...CB  
NEAR TERM...CB  
SHORT TERM...CB  
LONG TERM...CB/MET  
AVIATION...  
MARINE...CB/MET  
HYDROLOGY...CB/MET/DW  
TIDES/COASTAL FLOODING...  
EQUIPMENT...  
 
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