Area Forecast Discussion
Issued by NWS Upton, NY

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000 FXUS61 KOKX 282010 AFDOKX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NEW YORK NY 410 PM EDT SUN SEP 28 2014 .SYNOPSIS... HIGH PRESSURE SLOWLY SLIDES TO THE SOUTH INTO MONDAY. A BACKDOOR COLD FRONT APPROACHES FROM THE NORTH LATE MONDAY...THEN PUSHES TO THE SOUTH OF THE TRI-STATE LATE MONDAY NIGHT. UNSETTLED WEATHER WILL BE THE RULE DURING TUESDAY AND WEDNESDAY AS A FEW UPPER LEVEL DISTURBANCES MOVE ACROSS THE AREA. HIGH PRESSURE IS THEN EXPECTED TO PROVIDE DRY WEATHER THURSDAY INTO FRIDAY AS A COLD FRONT APPROACHES FROM THE WEST. THIS FRONT WILL MOVE ACROSS THE REGION FRIDAY NIGHT INTO SATURDAY WITH HIGH PRESSURE RETURNING FOR SUNDAY. && .NEAR TERM /UNTIL 6 AM MONDAY MORNING/... PATCH OF BKN CIRRUS IS MOVING GRADUALLY NE ACROSS THE LOWER HUDSON VALLEY...SRN CT AND LONG ISLAND...AND WILL LEAD TO 1-2 HR PD OF SUNSHINE FILTERED BY HIGH CLOUDS. OTHERWISE EXPECT SUNNY SKIES THIS AFTERNOON. MODIFIED HIGH TEMPS DOWN SLIGHTLY BASED ON TREND FROM PREV FCST...EXCEPT ACROSS INTERIOR SRN CT WHERE TEMPS ARE RUNNING AHEAD OF FCST. THAT YIELDS HIGHS IN THE MID 80S FOR MOST INLAND SPOTS...LOWER 80S MOST ELSEWHERE...AND UPPER 70S ALONG MOST SOUTH FACING SHORES. SEE CLIMATE SECTION FOR DETAILS ON POSSIBLE RECORD HIGHS. BKN HIGH CLOUDS OVER PA WILL STREAM IN OVERNIGHT...AND LIMIT RADIATION FOG POTENTIAL EXCEPT OVER SE CT AND ERN LONG ISLAND. NAM CONTINUES TO BE MORE AGGRESSIVE WITH LOW LEVEL MOISTURE RETURN...AND HAS BEEN RIGHT IN THIS RESPECT OVER MOS GUIDANCE WITH SOME RECENT EVENTS...SO WILL STILL HAVE TO MONITOR THE POTENTIAL FOR MORE WIDESPREAD FOG OVERNIGHT. && .SHORT TERM /6 AM MONDAY MORNING THROUGH MONDAY NIGHT/... CLOUDS WILL CONTINUE TO INCREASE ON MON AS A WEAK UPPER TROUGH APPROACHES. NO PRECIP EXPECTED...BUT CLOUD COVER AND LOWERING HEIGHTS ALOFT SHOULD LEAD TO TEMPS NOT QUITE AS WARM AS THOSE OF TODAY BUT STILL ON THE WARM SIDE OF GUIDANCE...WITH UPPER 70S AND LOWER 80S. A BACK DOOR COOL FRONT SHOULD SLIP INTO ERN SECTIONS LATE MON NIGHT WHILE THE UPPER TROUGH TO THE WEST SHARPENS...SO HAVE FCST LIKELY POP FOR ERN LONG ISLAND...CHANCE POP FOR THE REST OF LONG ISLAND AND SRN CT...AND ONLY SLIGHT CHANCE POP ELSEWHERE. GFS/NAM MOS BLEND FOR LOW TEMPS...WITH 55-60 INLAND AND 60-65 ELSEWHERE... LOOKED REASONABLE. && .LONG TERM /TUESDAY THROUGH SUNDAY/... MODEL GUIDANCE HAS COME INTO BETTER AGREEMENT TODAY WITH THE MID WEEK PERIOD...LEADING TO AVERAGE FORECAST CONFIDENCE. THE 00Z/28 ECMWF STARTED TO SHOW A CONSISTENT TREND AND WAS SIMILAR TO OTHER MODEL SOLNS...BUT THE 12Z RUN HAS SHIFTED THE LOW CLOSER TO THE COAST LEADING TO MORE RAINFALL ACROSS ERN LI AND SE CT. THE OTHER THING WORTH NOTING IS THAT MOST OF THE GUIDANCE KEEPS THE NORTHERN AND SRN BRANCHES OF THE JET SEPARATE AS OPPOSED TO YESTERDAY WHEN THEY WERE PHASING THEM. UNSETTLED WEATHER IS EXPECTED TUE AND WED AS A MID LEVEL SHORTWAVE PUSHES THROUGH AND A CUT OFF LOW MOVES ACROSS THE AREA. SOME UNCERTAINTY IN TIMING AND PLACEMENT OF THE CUTOFF TUE NIGHT THROUGH WED NIGHT...AND WOULD EXPECT WDLY SCT TO SCT SHOWERS ASSOCIATED WITH IT. TOUGH TO PINPOINT EXACTLY WHERE...SO BLANKETED LOW CHC POPS DURING THIS TIME. RIDGING BUILDS BACK IN THU/THU NIGHT PROVIDING DRY AND FAIR WEATHER. A COLD FRONT WILL APPROACH FRI AND SLOWLY MOVE ACROSS THE AREA FRI NIGHT INTO SAT DUE TO DOWNSTREAM BLOCKING. THE MAJORITY OF FRI LOOKS TO BE DRY WITH RIDGING WEAKENING...ALTHOUGH CLOUDS WILL INCREASE. A WAVE OF LOW PRES IS FORECAST TO FORM ON THE FRONT IN THE UPPER MID ATLANTIC REGION AND TRACK ACROSS THE AREA SAT. CHC POPS FRI NIGHT INTO SAT. UPPER TROUGH SWINGS THROUGH SAT NIGHT AND THERE COULD BE A FEW ADDITIONAL SHOWERS...BUT MAINLY N/W OF NYC. HIGH PRES BUILDS BACK IN FOR SUN...WITH DRY WEATHER EXPECTED. TEMPS WILL BE SLIGHTLY ABOVE NORMAL LEVELS DURING THE DAY AND SLIGHTLY BELOW NORMAL AT NIGHT. && .AVIATION /20Z SUNDAY THROUGH FRIDAY/... VFR WEATHER IS FORECAST THROUGH 18Z MONDAY. A LARGE AREA OF WEAK HIGH PRESSURE WILL CONTINUE MOVING SLOWLY EAST OF THE AREA THROUGH TONIGHT. A COLD FRONT WILL MOVE SOUTHWEST TOWARD THE AREA LATE MONDAY. SCT-BKN MAINLY CIRRUS CLOUDS WILL CONTINUE MOVING NORTHEAST ACROSS THE AREA TONIGHT WITH VFR CIGS DEVELOPING AFTER SUNRISE MONDAY. LIGHT SEA BREEZES RANGING FROM 160 TO 210 DEGS NEAR 10 KT WILL CONTINUE UNTIL SUNSET...THEN BECOME LIGHT AND VARIABLE TONIGHT. SIMILAR LIGHT SEA BREEZES WILL REDEVELOP BY 17Z MONDAY AND CONTINUE UNTIL SUNSET. .OUTLOOK FOR 18Z MONDAY THROUGH FRI... .MON NIGHT-WED...CHANCE OF MVFR CIGS VSBY AND RAIN...MAINLY EAST OF THE NYC TERMINALS. WINDS EAST 10-15 KT. .WED NIGHT-THU NIGHT...MAINLY VFR. .FRI...CHANCE OF MVFR REDEVELOPING. && .MARINE... WINDS AND SEAS WILL REMAIN BELOW SMALL CRAFT ADVISORY LEVELS THROUGH AT LEAST TUESDAY AS A LARGE SPRAWLING AREA OF HIGH PRESSURE MOVES SLOWLY EAST ACROSS THE AREA THEN OFFSHORE. CONFIDENCE IN THE FORECAST IS AVERAGE FOR THE MID-WEEK PERIOD...BUT LOW PRES LOOKS TO IMPACT THE WATERS STARTING LATE TUESDAY AND POSSIBLY LASTING THROUGH THE END OF THE WEEK. GUSTY EAST TO NE WINDS COULD AVERAGE 15-20 KT WITH 20-30 KT GUSTS ON MOST WATERS...AND IF THESE WINDS DEVELOP...OCEAN SEAS WOULD BUILD TO 4-6 FT BY WEDNESDAY...AND THEN TO 6-9 FT BY FRIDAY. && .HYDROLOGY... DRY THROUGH MONDAY. WHILE THERE WILL BE UNSETTLED WEATHER TUE AND WED...THE LATEST MODEL GUIDANCE CONTINUES TO INDICATE FAIRLY LIGHT BASIN AVG QPF. THE EXCEPTION IS THE 12Z ECMWF WHICH HAS BEEFED UP ITS RAINFALL AMOUNTS OVER ERN LI AND SE CT...BUT THIS MODEL HAS BEEN VERY INCONSISTENT OVER THE LAST FEW DAYS SO ITS CREDIBILITY IS LOW. SINCE THERE IS THE POTENTIAL FOR A COASTAL LOW LINGERING NEAR THE AREA...WITH A PROLONGED PERIOD OF ONSHORE FLOW...WILL CONTINUE TO MONITOR FOR THE POSSIBILITY THAT THE SCENARIO CHANGES TO ONE PRODUCING MORE IN THE WAY OF RAINFALL FOR THE MIDDLE OF THE WORK WEEK. && .CLIMATE... RECORD AND FCST HIGHS FOR TODAY SEPTEMBER 28TH... LOCATION.......RECORD/YEAR SET...FCST... NEWARK.............85/1954*.......87.... BRIDGEPORT.........81/1959........81.... CENTRAL PARK.......88/1881........85.... LAGUARDIA..........86/1943........85.... JFK AIRPORT........82/1948........77.... ISLIP..............78/2007*.......80.... * AND IN PREVIOUS YEARS && .OKX WATCHES/WARNINGS/ADVISORIES... CT...NONE. NY...NONE. NJ...NONE. MARINE...NONE. && $$ SYNOPSIS...GOODMAN/24 NEAR TERM...GOODMAN SHORT TERM...GOODMAN LONG TERM...24 AVIATION...GC MARINE...GOODMAN/24 HYDROLOGY...24 CLIMATE...

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