262
FXUS61 KOKX 211425
AFDOKX
AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE NEW YORK NY
925 AM EST SAT DEC 21 2024
SYNOPSIS
DEEPENING LOW PRESSURE TO THE NORTHEAST TRACKS INTO THE CANADIAN
MARITIMES TODAY. MEANWHILE HIGH PRESSURE BUILDS INTO THE REGION
THROUGH SUNDAY, AND THEN REMAINS IN CONTROL INTO MONDAY. A WEAK
FRONTAL SYSTEM APPROACHES AND MOVES THROUGH THE AREA MONDAY
NIGHT INTO TUESDAY. HIGH PRESSURE BUILDS BACK INTO THE AREA
WEDNESDAY AND REMAINS IN CONTROL THROUGH FRIDAY.
NEAR TERM /UNTIL 6 PM THIS EVENING/
A SHORTWAVE AND UPPER TROUGH MOVE EAST OF THE AREA, AND
OFFSHORE LATE MORNING INTO THIS AFTERNOON, AS THE SURFACE TROUGH
MOVES SOUTHEAST AS OFFSHORE LOW PRESSURE TRACKS INTO THE
CANADIAN MARITIMES. LIGHT TO MODERATE SNOW WILL TAPER WEST TO
EAST OVER THE NEXT 1-3 HOURS AND AS OF THIS 9AM UPDATE, HAS
ALREADY ENDED IN NE NJ, NYC, WESTERN NASSAU, AND PARTS OF THE
LOWER HUDSON VALLEY. SNOW AMOUNTS HAVE RANGED ANYWHERE FROM 0.5
INCHES TO 4.5 INCHES ACROSS THE AREA. ONLY AN INCH OR LESS IS
EXPECTED IN AREAS STILL EXPERIENCING SNOW AS IT TAPERS AND
EXITS.
A SPECIAL WEATHER STATEMENT REMAINS FOR MUCH OF THE AREA FOR THE
POSSIBILITY OF SNOW COVERED UNTREATED SURFACES AND SLICK TRAVEL
THIS MORNING.
HIGH PRESSURE BUILDING INTO THE REGION BEHIND DEPARTING LOW
PRESSURE WILL BRING THE COLDEST AIRMASS OF THE SEASON SO FAR,
AND TEMPERATURES WILL BE NEAR STEADY THROUGH THE DAY.
SHORT TERM /6 PM THIS EVENING THROUGH MONDAY/
SURFACE HIGH PRESSURE BUILDS IN TONIGHT THROUGH SUNDAY AND
REMAINS OVER THE REGION INTO MONDAY. THE NBM AND MAV GUIDANCE
HANDLE TEMPERATURES WELL TONIGHT INTO MONDAY. WITH GUSTY
NORTHWEST WINDS CONTINUING TONIGHT WIND CHILL VALUES WILL BE AS
LOW AS 3 BELOW ZERO TO AROUND 5 ABOVE ZERO, AND IS ABOVE THE
THRESHOLDS FOR COLD WEATHER ADVISORIES. TEMPERATURES BEGIN TO
MODERATE A LITTLE MONDAY.
LONG TERM /MONDAY NIGHT THROUGH FRIDAY/
TWO UPPER LEVEL SHORTWAVES APPROACH THE NORTHEAST US BY MONDAY
NIGHT, ONE MOVING IN FROM THE WEST OVER THE GREAT LAKES AND ONE
DIVING DOWN FROM HUDSON BAY REGION OF CANADA. THESE TWO SHORTWAVES
PHASE TOGETHER OVER UPSTATE NY AND INTERIOR NEW ENGLAND MONDAY NIGHT
INTO TUESDAY. AT THE SURFACE, A WEAK LOW PASSES BY DRAGGING A
COLD FRONT THROUGH THE AREA. MOST OF THE FORCING SHOULD BE NORTH OF
THE AREA AND WITHOUT MUCH MOISTURE, ONLY A CHANCE OF PRECIPITATION
WILL BE POSSIBLE, WHICH DEPENDING ON THE TIMING OF THE PASSAGE MAY
BE IN THE FORM OF SNOW OR RAIN, ESPECIALLY CLOSER TO THE COAST.
EITHER WAY, NOT MUCH IN THE WAY OF ACCUMULATING PRECIPITATION IS
EXPECTED WITH PERHAPS A FEW TENTHS OF SNOW FOR NORTHERN INTERIOR
PORTIONS OF THE CWA.
BEYOND THEN, UPPER LEVEL RIDGING MOVES IN FOR CHRISTMAS DAY AND INTO
THE END OF THE WEEK AS THE AREA WILL REMAIN GENERALLY UNDER HIGH
PRESSURE WITH TWO AREAS OF LOW PRESSURE TO THE EAST OVER THE WESTERN
ATLANTIC AND TO THE WEST OVER THE CENTRAL US BY THE END OF THE WEEK.
A FEW WEAK UPPER LEVEL SHORTWAVES MAY TRY TO MOVE OVERHEAD, BUT
GIVEN LARGE SCALE SUBSIDENCE, CHANCE OF ANY PRECIPITATION IS LOW AT
THIS TIME. THE LOW OVER THE CENTRAL US MAY APPROACH THE AREA BY
FRIDAY OR SATURDAY, BUT GUIDANCE DISAGREES ON STRENGTH AND TIMING.
TEMPERATURES SHOULD BE FAIRLY SEASONABLE THROUGH THE LONG TERM WITH
HIGHS GENERALLY IN THE UPPER 30S FOR THE INTERIOR AND LOW TO MIDDLE
40S ALONG THE COAST THROUGH MUCH OF THE WEEK. A SLIGHT WARM UP MAY
OCCUR AS THE FRONTAL SYSTEM APPROACHES BY THE END OF THE WEEK.
AVIATION /15Z SATURDAY THROUGH WEDNESDAY/
A POLAR FRONT MOVES THROUGH THIS MORNING, THEN HIGH PRESSURE
BEGINS TO BUILD IN THIS AFTERNOON INTO TONIGHT.
LINGERING MVFR/IFR CONDITIONS IN -SN EAST OF THE NYC METRO
WILL QUICKLY BECOME VFR THROUGH 17Z. VFR THEN PREVAILS FOR THE
REST OF THE TAF PERIOD.
NW WINDS INCREASE THIS MORNING BECOMING 15-20KT GUSTING 25-30 KT
LATE THIS MORNING INTO THE EVENING. GUSTS WILL CONTINUE
OVERNIGHT, BUT WEAKEN TO 20-25KT. GUSTS BECOME MORE OCCASIONAL
SUNDAY MORNING BEFORE ENDING AFTER 18Z SUNDAY.
...NY METRO (KEWR/KLGA/KJFK/KTEB)TAF UNCERTAINTY...
GUSTS MAY END UP A FEW KT HIGHER AT TIMES LATE THIS MORNING INTO
THE AFTERNOON.
OUTLOOK FOR 12Z SUNDAY THROUGH WEDNESDAY...
SUNDAY: VFR. NW WINDS 10-15G20-25KT EARLY.
MONDAY: VFR.
MONDAY NIGHT-TUESDAY: CHANCE OF MVFR IN LIGHT SNOW OR A LIGHT
RAIN/SNOW MIX.
WEDNESDAY: MAINLY VFR.
DETAILED INFORMATION, INCLUDING HOURLY TAF WIND COMPONENT FORECASTS,
CAN BE FOUND AT: HTTPS:/WWW.WEATHER.GOV/ZNY/N90
MARINE
DEEPENING LOW PRESSURE SOUTH OF NOVA SCOTIA TRACKS INTO THE
CANADIAN MARITIMES TODAY AS HIGH PRESSURE BUILDS IN FROM THE
WEST. OCEAN SEAS REMAIN ELEVATED AT 5 TO 7 FEET, AND GUSTY
NORTHWEST WINDS WILL DEVELOP THIS MORNING AS COLD AIR MOVES INTO
THE REGION. SMALL CRAFT ADVISORIES REMAIN IN EFFECT FOR ALL THE
FORECAST WATERS TODAY INTO THIS EVENING. AS THE HIGH BUILDS
TOWARD THE WATERS TONIGHT, WINDS AND GUSTS WILL FALL BELOW
ADVISORY LEVELS ON THE NON OCEAN WATERS, AND ON THE OCEAN WATERS
EARLY SUNDAY MORNING, WITH SEAS REMAINING ELEVATED INTO EARLY
SUNDAY AFTERNOON. ONCE THE ADVISORIES END, CONDITIONS REMAIN
BELOW ADVISORY LEVELS INTO MONDAY.
FREEZING SPRAY IS NOT EXPECTED TO MEET ADVISORY LEVELS AS OCEAN
WATER TEMPERATURES REMAIN AROUND 50 AND INTO THE LOWER 50S,
DESPITE MARGINAL GUSTS AND AIR TEMPERATURES.
HIGH PRESSURE BUILDS ACROSS THE WATERS ON MONDAY WITH A WEAK
FRONTAL SYSTEM PASSING THROUGH THE AREA LATE MONDAY NIGHT INTO
TUESDAY. HIGH PRESSURE BUILDS BACK IN FOR WEDNESDAY WITH A WEAK
PRESSURE GRADIENT. WINDS AND SEAS DURING THIS TIME WILL
THEREFORE REMAIN BELOW SCA CRITERIA.
HYDROLOGY
THERE ARE NO HYDROLOGIC CONCERNS THROUGH NEXT WEEKEND.
OKX WATCHES/WARNINGS/ADVISORIES
CT...NONE.
NY...NONE.
NJ...NONE.
MARINE...SMALL CRAFT ADVISORY UNTIL MIDNIGHT EST TONIGHT FOR ANZ331-332-
335-338-340-345.
SMALL CRAFT ADVISORY UNTIL 1 PM EST SUNDAY FOR ANZ350-353-355.
SYNOPSIS...MET/MW
NEAR TERM...BR/MET
SHORT TERM...MET
LONG TERM...MW
AVIATION...DS/MW
MARINE...MET/MW
HYDROLOGY...MET/MW
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