Area Forecast Discussion
Issued by NWS Upton, NY

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000 FXUS61 KOKX 252352 AFDOKX AREA FORECAST DISCUSSION NATIONAL WEATHER SERVICE NEW YORK NY 652 PM EST THU DEC 25 2014 .SYNOPSIS... HIGH PRESSURE BUILDS OVER THE SOUTHEASTERN U.S. THROUGH SATURDAY. A COLD FRONT CROSSES THE TRI-STATE ON SUNDAY. THIS FRONT STALLS OUT WELL TO THE SOUTH OF LONG ISLAND...AS COLD CANADIAN HIGH PRESSURE BUILDS IN FROM THE WEST THROUGHOUT NEXT WEEK. MULTIPLE LOWS PASS ALONG THE FRONT FOR THE EARLY PART OF NEXT WEEK. && .NEAR TERM /UNTIL 6 AM FRIDAY MORNING/...
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STRATO-CU MIXING OUT WITH LOSS OF SURFACE HEATING EARLY THIS EVENING WITH SKIES BECOMING CLEAR. FORECAST OVERALL IS ON TRACK WITH ONLY MINOR ADJUSTMENTS MADE TO BETTER MATCH OBSERVED TRENDS WITH DEWPOINT AND TEMPERATURES. WINDS DROP OFF QUICKLY AS HIGH PRESSURE BUILDS IN FROM THE WEST WITH A DECREASE IN THE PRESSURE GRADIENT. LOWS ARE BLENDED NAM AND GFS MOS WHICH HAD NEARLY NO SPREAD.
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&& .SHORT TERM /6 AM FRIDAY MORNING THROUGH SATURDAY/... RIDGING ALOFT WITH ABOVE NORMAL TEMPS FOR THE PERIOD. HAVE FCST ABOVE NAM/GFS MOS BASED ON NEARLY FULL SUN AND 552 DM THICKNESS FOR SATURDAY. ALSO...ENSEMBLE MOS FROM 00Z..EKD MOS AND GFS PARALLEL ALL SUGGESTING 50-55. LOOKS LIKE A GREAT DAY TO BE OUTSIDE WITH LIGHT WINDS. && .LONG TERM /SATURDAY NIGHT THROUGH THURSDAY/... OVERALL...IN THE MID TO UPPER LEVELS...THE RIDGE FLATTENS GOING INTO EARLY NEXT WEEK. THIS LEAVES A ZONAL FLOW THROUGH MIDWEEK AND THEN A TREND TOWARDS MORE OF A TROUGH ACROSS THE NORTHEAST TOWARDS THE END OF THE WEEK. AT THE SURFACE...A WEAK PARENT LOW MOVES THROUGH SOUTHEAST CANADA AND INTO THE CANADIAN MARITIMES SUNDAY...DRAGGING A COLD FRONT ACROSS. THE FRONT THEN STALLS WELL SOUTH OF LONG ISLAND GOING INTO EARLY NEXT WEEK WITH MULTIPLE AREAS OF LOW PRESSURE RIDING ALONG THE FRONT. ONE BIG FEATURE TO NOTE NEXT WEEK IS THE VERY STRONG HIGH PRESSURE MOVING INTO THE NORTHWEST U.S. LIKEWISE...A VERY COLD SOURCE OF AIR WILL BE MOVING INTO THE NORTHWEST U.S. THIS AIRMASS GRADUALLY MOVES SOUTH AND EAST THROUGH THE WEEK. IN TERMS OF SENSIBLE WEATHER...AN INCREASING CHANCE OF PRECIPITATION LATE SATURDAY NIGHT INTO SUNDAY ASSOCIATED WITH THE COLD FRONTAL PASSAGE. THE AMOUNTS ARE LIGHT...WITH LESS THAN A QUARTER OF AN INCH LIKELY. MUCH OF IT IS FORECAST TO FALL DURING THE DAY SUNDAY INTO SUNDAY EVENING...SO THIS ALLOWS MOST PRECIP TO BE RAIN SHOWERS ESPECIALLY NEAR THE COAST. INTERIOR WILL PROBABLY HAVE MORE CHANCE OF SEEING SOME SNOW SHOWERS. THE NEXT PRECIP IS ONLY SLIGHT CHANCE FOR MONDAY INTO POSSIBLY MONDAY EVENING. COLDER AIR IN PLACE HERE BUT AMOUNTS VERY LIGHT...A FEW HUNDREDTHS OF AN INCH OR LESS. THE PRECIP WILL BE A MIX OF RAIN AND SNOW...BUT AGAIN WITH AFOREMENTIONED LIGHT AMOUNTS...NO ACCUMULATION OF ANY SNOW IS FORECAST. TEMPERATURES OVERALL A COLDER TREND. ABOVE NORMAL HIGHS SUNDAY...NEAR NORMAL MONDAY...AND BELOW NORMAL THEREAFTER. && .AVIATION /00Z FRIDAY THROUGH TUESDAY/...
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HIGH PRESSURE WILL CONTINUE TO BUILD IN. GUSTY W FLOW WILL GRADUALLY DIMINISH AND BKN VFR CIGS WILL ALSO SCATTER AFTER SUNSET. VFR ON FRIDAY...WITH WESTERLY FLOW GRADUALLY BACKING SW LATE IN THE DAY. FEW-SCT 2 KFT CU. NY METRO ENHANCED AVIATION WEATHER SUPPORT... DETAILED INFORMATION...INCLUDING HOURLY TAF WIND COMPONENT FCSTS CAN BE FOUND AT: HTTP:/WWW.ERH.NOAA.GOV/ZNY/N90 (LOWER CASE) KJFK FCSTER COMMENTS: OCCASIONAL GUSTS TO 20 KT POSSIBLE BETWEEN 13Z AND 16Z FRIDAY. TIMING OF WINDS BACKING MAY BE OFF BY 1 TO 2 HRS. FEW- SCT 2 KFT CU IN THE AFTERNOON. KLGA FCSTER COMMENTS: OCCASIONAL GUSTS TO 20 KT POSSIBLE BETWEEN 13Z AND 16Z FRIDAY. TIMING OF WINDS BACKING MAY BE OFF BY 1 TO 2 HRS. FEW-SCT 2 KFT CU IN THE AFTERNOON. KEWR FCSTER COMMENTS: OCCASIONAL GUSTS TO 20 KT POSSIBLE BETWEEN 13Z AND 16Z FRIDAY. TIMING OF WINDS BACKING MAY BE OFF BY 1 TO 2 HRS. FEW-SCT 2 KFT CU IN THE AFTERNOON. KTEB FCSTER COMMENTS: TIMING OF WINDS BACKING MAY BE OFF BY 1 TO 2 HRS. FEW-SCT 2 KFT CU IN THE AFTERNOON. KHPN FCSTER COMMENTS: TIMING OF WINDS BACKING MAY BE OFF BY 1 TO 2 HRS. FEW-SCT 2 KFT CU IN THE AFTERNOON. KISP FCSTER COMMENTS: TIMING OF WINDS BACKING MAY BE OFF BY 1 TO 2 HRS. .OUTLOOK FOR 00Z SAT THROUGH TUE... .FRI NIGHT-SAT...VFR. .SUNDAY...MVFR WITH CHANCE OF LIGHT RAIN. .MON...VFR. .TUE...LOW CONFIDENCE VFR.
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&& .MARINE...
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WINDS AND WAVES GENERALLY ON TRACK WITH SCA TIMES KEPT THE SAME AS PREVIOUS FORECAST. WINDS LOWER THROUGH THE EVENING TO SCA LEVEL BY MIDNIGHT. WAVES ON THE OCEAN THAT ARE CURRENTLY AS HIGH AS 7 FT WILL LOWER AS WELL. WAVES ON THE EASTERN OCEAN WATERS COULD POSSIBLY HOLD ON TO 5FT SCA CRITERIA A FEW HOURS AFTER THE SCA ENDS AT 08Z. SUB-SCA CONDITIONS ARE ANTICIPATED ON FRIDAY INTO NEXT WEEK. THE ONLY EXCEPTION WOULD BE SUNDAY WHEN 5 FT SEAS ARE FORECAST FOR THE OCEAN SOUTHEAST OF MONTAUK POINT. THERE IS UNCERTAINTY ASSOCIATED WITH THIS AND IS DEPENDENT ON HOW THE COLD FRONT AND PARENT LOW TREND WITH THE RESPONSE OF THE PRESSURE GRADIENT.
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&& .HYDROLOGY... DRY THROUGH SATURDAY NIGHT WITH NO SIGNIFICANT PRECIPITATION EXPECTED FROM SUNDAY-WEDNESDAY AT THIS TIME. && .OKX WATCHES/WARNINGS/ADVISORIES... CT...NONE. NY...NONE. NJ...NONE. MARINE...SMALL CRAFT ADVISORY UNTIL MIDNIGHT EST TONIGHT FOR ANZ330-335- 338-340-345. SMALL CRAFT ADVISORY UNTIL 3 AM EST FRIDAY FOR ANZ350-353-355. && $$ SYNOPSIS...TONGUE NEAR TERM...JM/TONGUE SHORT TERM...TONGUE LONG TERM...JM AVIATION...NV MARINE...JM/TONGUE HYDROLOGY...JM/TONGUE

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