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Jan 23/24 Major Coastal Storm Discussion


Zelocita Weather

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I'd rather be in Long Beach than north of I-84 for this storm so far, for sure. They aren't out of the woods yet, but if models tonight and tomorrow 12z don't shift in their favor, I'd say they're done for anything more than a few inches.

Given the sharp gradient forecasts, a few flakes rather than a few inches is more likely up here. Yeah, I know, you are glad you don't live where I do....

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UPTON UPDATE

000

FXUS61 KOKX 202129

AFDOKX

AREA FORECAST DISCUSSION

NATIONAL WEATHER SERVICE NEW YORK NY

429 PM EST WED JAN 20 2016

.SYNOPSIS...

AN UPPER LEVEL DISTURBANCE OVER THE LOWER GREAT LAKES EARLY THIS

EVENING MOVES ACROSS THE REGION OVERNIGHT. HIGH PRESSURE OVER THE

OHIO VALLEY ON THURSDAY THEN BUILDS EAST THROUGH FRIDAY MORNING.

HIGH PRESSURE SLOWLY RETREATS TO THE NORTHEAST FROM FRIDAY

THROUGH SUNDAY. MEANWHILE...A COASTAL LOW MOVES ACROSS THE

SOUTHEAST TO THE MID ATLANTIC COAST FRIDAY AND FRIDAY NIGHT...THEN

SLOWLY TRACKS TO THE SOUTH THEN SOUTHEAST OF LONG ISLAND THROUGH

SUNDAY. HIGH PRESSURE BUILDS IN LATE SUNDAY THROUGH MONDAY NIGHT.

MULTIPLE COLD FRONTS WILL MOVE ACROSS THE AREA TUESDAY INTO

WEDNESDAY.

&&

.NEAR TERM /THROUGH THURSDAY NIGHT/...

LATEST WATER VAPOR IMAGERY SHOWS WELL DEFINED MID/UPPER LEVEL

SHORTWAVE OVER THE GREAT LAKES THAT WILL TRACK ACROSS THE AREA

OVERNIGHT. MID AND HIGH LEVEL CLOUDS PRECEDING THE FEATURE WILL

CONTINUE TO WORK IN FROM THE WEST THIS EVENING WITH MOSTLY CLOUDY

SKIES THROUGH MOST OF THE NIGHT. WHILE THERE IS SOME LIFT

ASSOCIATED WITH THE FEATURE IN THE MID AND UPPER LEVELS...THE SUB

CLOUD LAYER IS VERY DRY AND WILL LIKELY ONLY SUPPORT SOME

FLURRIES. WEAK COLD ADVECTION ENSUES WITH THE PASSING OF THE

DISTURBANCE.

ON THU...WEAK RIDGING BUILDS EAST FROM THE OHIO VALLEY WITH THE

NORTHERN BRANCH OF THE POLAR JET SENDING ANOTHER SHORTWAVE SE

FROM CENTRAL CANADA WITH A CONTINUED FEED OF POLAR AIR. IN

FACT...HIGH PRESSURE OVER THE UPPER MIDWEST AND CENTRAL CANADA

WILL BEGIN TO BLEED EAST NORTH OF THE GREAT LAKES LAYING DOWN THE

FOUNDATION FOR COLD AIR AHEAD OF A DEVELOPING STORM SYSTEM OVER

THE TN VALLEY THU NIGHT.

HIGHS ON THU WILL BE A BIT COOLER IN THE LOW TO MID 30S...WITH

LOWS IN THE MID TEENS TO LOWER 20S BOTH THU AND FRI MORNINGS. THIS

IS SLIGHTLY BELOW NORMAL.

&&

.SHORT TERM /FRIDAY THROUGH SUNDAY/...

CONTINUE TO MONITOR A COASTAL LOW THAT WILL TRACK TO THE SOUTH OF

LONG ISLAND THIS WEEKEND. QUESTIONS STILL REMAIN ON THE EXACT

TRACK...BOTH IN TERMS OF HOW FAR NORTH THE STORM GOES AND

TIMING...AND STRENGTH OF THE STORM. ESPECIALLY NOTING REGION WILL BE

ON THE NORTHERN EDGE OF THE PRECIPITATION SHIELD OF THE STORM...THIS

IS A LOW CONFIDENCE FORECAST DUE TO THE UNCERTAINTY.

ALL MODELS AGREE THAT A CUTOFF LOW DEVELOPS OVER THE DEEP SOUTH BY

FRIDAY MORNING...THEN TRACKS EAST NORTHEAST INTO THE MID ATLANTIC

STATES BY SATURDAY MORNING. THE STORM SYSTEM THEN TOTAL OCCLUDES AS

IT TRACKS TO THE SOUTH AND MAYBE SOUTHEAST OF LONG ISLAND INTO

SUNDAY. MODELS DIFFER ON THE PACE AT WHICH THE CUT OFF LOW AND THEN

OCCLUSION TRACK TO THE EAST NORTHEAST OVER THE WEEKEND. THIS RESULTS

IN DIFFERENCES IN THE TIMING/STRENGTH/PLACEMENT OF THE ASSOCIATED

SURFACE LOW. WHAT THE MODELS ARE IN FAIRLY GOOD AGREEMENT ON IS THAT

A 1030 HPA HIGH BUILDS INTO S QUEBEC/ONTARIO BY 12Z SATURDAY...AND

THAT THIS HIGH WILL REMAIN SUFFICIENTLY STRONG AS IT RETREATS TO THE

NORTHEAST TO KEEP A SUPPLY OF LOW LEVEL COLD AIR FEEDING DOWN INTO

THE REGION THROUGH THE STORM. AS A RESULT...EXCEPT FOR POSSIBLY

MIXING WITH RAIN/SNOW MIX OVER EASTERN AND SOUTHWESTERN SUFFOLK

COUNTY SATURDAY AFTERNOON/EVENING...PRECIPITATION SHOULD BE ALL SNOW

DURING THE EVENT.

THE MODELS HAVE IN GENERAL SLOWED DOWN THE TIMING WITH THE SYSTEM.

IT APPEARS THAT RIDGING DOWNSTREAM OF THE SYSTEM SHOULD BE

SUFFICIENTLY STRONG TO KEEP THINGS DRY FROM FRIDAY INTO FRIDAY

EVENING...WITH SNOW DEVELOPING FROM SW TO NE FRIDAY NIGHT. EVEN THEN

THERE IS SOME UNCERTAINTY IN HOW RAPIDLY SNOW PUSHES NE INTO THE

CWA...WITH SOME POSSIBILITY THAT MOST...IF NOT ALL...OF THE CWA DOES

NOT RECEIVE ANY SNOWFALL UNTIL SATURDAY MORNING.

CONFIDENCE HAS INCREASED THAT THE STORM WILL BRING MEASURABLE

PRECIPITATION INTO ALL BUT NORTHERN INTERIOR PORTIONS OF THE TRI-

STATE...SO HAVE INCREASED POPS TO CATEGORICAL ON SATURDAY IN THOSE

AREAS. SATURDAY NIGHT HAVE LIKELY POPS EVERYWHERE...TAPERING OFF TO

CHANCE OVER FAR NW PORTIONS OF THE CWA. PRECIPITATION SHOULD TAPPER

OFF OVER MOST AREAS SUNDAY MORNING...HOWEVER DO LINGER SLIGHT CHANCE

POPS OVER THE EASTERN 2/5THS OF THE CWA SUNDAY AFTERNOON.

CONFIDENCE IS ALSO INCREASING IN THE IDEA THAT MOST...IF NOT ALL OF

THE SOUTHERN 1/2 OF THE CWA WILL RECEIVE AT LEAST 6 INCHES OF

SNOW...EXCEPT FOR POSSIBLY EASTERN SUFFOLK COUNTY...WHERE RAIN

MIXING IN COULD LIMIT AMOUNTS. FARTHER NORTH...IT IS BECOMING MORE

CERTAIN THAT AN ADVISORY LEVEL (3-6 INCH RANGE) SNOWFALL SHOULD

OCCUR...EXCEPT FOR ACROSS FAR N PORTIONS OF THE LOWER HUDSON

VALLEY/SW CT...WHERE 3 INCHES OF SNOW IS STILL IN QUESTION...BUT

DEFINITELY POSSIBLE. EVEN IN THE NORTHERN 1/2 OF THE CWA...WARNING

LEVEL SNOWS ARE STILL WITHIN THE REASONABLE REALM OF POSSIBILITIES

FOR THIS SYSTEM. GIVEN THE UNCERTAINTY...AND THAT MOST...IF NOT ALL

THE SNOW WILL NOT START FALLING UNTIL SATURDAY...HAVE DECIDED NOT

TO ISSUE ANY WINTER WEATHER HEADLINES WITH THIS ISSUANCE.

NEXT ISSUE WITH THIS STORM WILL BE THE WINDS. WITH 950-850 HPA WINDS

OF 45-60 KT FORECAST FROM AREAS AROUND LONG ISLAND SOUND AND MOST OF

NORTHEAST NEW JERSEY...CONFIDENCE IS INCREASING THAT WIND ADVISORY

LEVEL WINDS (SUSTAINED WINDS 31-39 MPH FOR AT LEAST ONE HOUR OR ANY

GUST OF 46-57 MPH) COULD OCCUR WITH THIS STORM IN THIS AREA...FROM

LATE FRIDAY NIGHT INTO SATURDAY EVENING. THERE IS A SMALL CHANCE

THAT WIND ADVISORY LEVEL WINDS COULD OCCUR ELSEWHERE IN THE

CWA...ESPECIALLY OVER HIGHER ELEVATIONS. THERE IS ALSO A SMALL

CHANCE THAT HIGH WIND WARNING CRITERIA COULD BE REACHED OVER

PORTIONS OF LONG ISLAND AND POSSIBLY NYC AND COASTAL SE CT. GIVEN

THE UNCERTAINTY THOUGH OVER THE TRACK/TIMING/STRENGTH OF THE

STORM...HAVE DECIDED NOT TO ISSUE ANY WIND RELATED HEADLINES WITH

THIS STORM.

WITH THESE WINDS AND THE EXPECTATION OF SNOWFALL...BLIZZARD

CONDITIONS ARE POSSIBLE AS WELL OVER AREAS RECEIVING MAINLY SNOWFALL

AND ADVISORY LEVEL WINDS. WILL CONTINUE TO MONITOR THIS

POSSIBILITY...AND COULD REFLECT IN ANY WINTER WEATHER HEADLINES

WHICH ARE ISSUED IN THE FUTURE.

CONDITIONS IMPROVE ON SUNDAY AS RIDGING BUILDS INTO THE REGION IN

THE WAKE OF THE DEPARTING STORM.

TEMPERATURES FRIDAY-SUNDAY SHOULD RUN BELOW NORMAL FOR HIGHS. LOWS

SHOULD RUN BELOW NORMAL FRIDAY NIGHT...AND SLIGHTLY ABOVE NORMAL ON

SATURDAY.

&&

.LONG TERM /SUNDAY NIGHT THROUGH WEDNESDAY/...

RIDGING BOTH ALOFT AND AT THE SFC BUILDS ACROSS THE AREA SUN

NIGHT INTO MON. THERE ARE THEN SOME DIFFERENCES THAT ARISE IN THE

GLOBAL MODELS WITH THE PHASING OF PAC SHORTWAVE ENERGY WITH THE

NORTHERN BRANCH OF THE POLAR JET. THE 12Z ECMWF VERSUS THE

GFS IS MORE CONSOLIDATED WITH THE ENERGY AND SENDS THE LONGWAVE

TROF TO THE EAST A BIT FASTER. THIS RESULTS IN TIMING ISSUES OF A

THE MAIN COLD FRONT...WHICH PASSES ACROSS THE AREA TUE EVENING

WITH THE ECWMF...WHILE THE GFS SENDS MULTIPLE WEAK COLD FRONTS

THROUGH THE REGION TUE INTO WED. THE RETURN TO COLDER THAN NORMAL

TEMPS IS DELAYED BY ABOUT 24H WITH THE GFS. FOR THE TIME...USED A

BLEND OF THE GLOBAL MODELS AND DELAYED THE THE ARRIVAL OF THE COLD

AIR AS COMPARED TO THE ECMWF. DURING THIS TIME...TEMPS WILL BE

SEVERAL DEGREES ABOVE NORMAL.

AS FOR ANY PCPN...THERE IS A LOW CHANCE TUE INTO TUE NIGHT WITH

WARM ADVECTION AHEAD OF A WAVE OF LOW PRESSURE THAT TRACKS NW OF

THE AREA. FOR THE MOST PART...THIS WILL BE IN THE FORM OF

RAIN...BUT THERE IS THE POSSIBILITY OF A RAIN/SNOW MIX INLAND.

RIGHT NOW QPF AMOUNTS LOOK TO BE VERY LIGHT.

&&

.AVIATION /21Z WEDNESDAY THROUGH MONDAY/...

HIGH PRESSURE BUILDS IN FROM THE WEST.

VFR INTO THIS EVENING. CHC FLURRIES AFTER AROUND MIDNIGHT TONIGHT.

NW WINDS AROUND 10KT DIM 5-10KT THIS EVENING.

...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: NO UNSCHEDULED AMENDMENTS EXPECTED.

KLGA FCSTER COMMENTS: NO UNSCHEDULED AMENDMENTS EXPECTED.

KEWR FCSTER COMMENTS: NO UNSCHEDULED AMENDMENTS EXPECTED.

KTEB FCSTER COMMENTS: NO UNSCHEDULED AMENDMENTS EXPECTED.

KHPN FCSTER COMMENTS: NO UNSCHEDULED AMENDMENTS EXPECTED.

KISP FCSTER COMMENTS: NO UNSCHEDULED AMENDMENTS EXPECTED.

.OUTLOOK FOR 18Z THURSDAY THROUGH MONDAY...

.THURSDAY AND THURSDAY NIGHT...VFR.

.FRIDAY...VFR.

.FRIDAY NIGHT...CHC SUB-VFR AND SNOW LATE. NE GUSTS 25KT LATE.

.SAT/SAT NIGHT...SNOW DEVELOPING BY LATE MORNING...POSSIBLY BECOMING

HEAVY AT TIMES WITH IFR AND LOWER CONDITIONS. NE WINDS AT 20-30 KT

WITH 40-50 KT GUSTS.

.SUNDAY...CHC SUB-VFR AND SNOW AM. VFR PM. N GUSTS 25-30 KT.

.MONDAY...VFR.

&&

.MARINE...

A PERSISTENT NW FLOW WILL CONTINUE OVER THE WATERS TONIGHT

THROUGH THURSDAY NIGHT BETWEEN HIGH PRESSURE TO THE WEST AND

CUTOFF LOW PRESSURE OVER NE CANADA. GENERALLY SUB SCA CONDITIONS

EXPECTED DURING THIS TIME...BUT POTENTIAL FOR MARGINAL SCA CONDS

ON OCEAN WATERS THURSDAY INTO THU NIGHT AS GRADIENT TIGHTENS AND

LAPSE RATES STEEPEN. VERTICAL WIND PROFILES SUPPORT WIND GUSTS

JUST BELOW 25 KT...SO WILL HOLD OFF AT THIS TIME ON ISSUING A SCA.

A RELATIVELY RELAXED PRESSURE GRADIENT OVER THE WATERS SHOULD

PRODUCE WINDS OF 15 KT OR LESS ON FRIDAY. THE PRESSURE GRADIENT

INCREASES FAIRLY RAPIDLY FRIDAY NIGHT...WITH GALE CONDITIONS

DEVELOPING ON THE OCEAN AND SMALL CRAFT CONDITIONS ON THE NON-OCEAN

WATERS BY LATE FRIDAY NIGHT. WITH 950-850 WINDS INCREASING TO 50-

60KT OVER THE WATERS SATURDAY/SATURDAY NIGHT...AND MARGINAL TO

DECENT LOW LEVEL MIXING POSSIBLE...GUSTS TO STORM FORCE ARE LIKELY

ON THE COASTAL OCEAN WATERS THEN...WITH GUSTS TO GALES LIKELY AND

STORM FORCE GUSTS POSSIBLE ON THE REMAINDER OF THE WATERS.

WINDS DIMINISH SUNDAY AS THE STORM DEPARTS...WITH WINDS FALLING TO

SMALL CRAFT LEVELS ON ALL...EXCEPT FOR POSSIBLY FAR EASTERN

ZONES...BY LATE SUNDAY.

SUB-SCA CONDITIONS DEVELOP BY SUN NIGHT WITH LINGERING HIGH SEAS

POSSIBLE INTO MON MORNING.

&&

.HYDROLOGY...

NO MEASURABLE PRECIP EXPECTED TONIGHT-FRIDAY.

THERE IS THE POTENTIAL FOR FROM AROUND 4/10THS TO AROUND 1 INCH

OF LIQUID EQUIVALENT QPF TO FALL FROM FRIDAY NIGHT THROUGH SUNDAY.

HIGHEST AMOUNTS OVER LONG ISLAND/NEW YORK CITY AND LOWEST AMOUNTS

OVER ORANGE COUNTY. THERE IS QUITE A BIT OF UNCERTAINTY IN THESE

AMOUNTS...WITH A CHANGE IN STORM TRACK OF EVEN 10-25 MILES

POSSIBLY HAVING QUITE AN IMPACT ON THE AMOUNT OF QPF WHICH OCCURS.

&&

.TIDES/COASTAL FLOODING...

A NOR`EASTER WILL LIKELY RESULT IN COASTAL FLOODING AROUND THE TIMES

OF HIGH TIDE FOR PORTIONS OF THIS WEEKEND. THE MOST VULNERABLE HIGH

TIDE WOULD BE THE SATURDAY NIGHT CYCLE.

FOR SATURDAY MORNING STRENGTHENING NORTHEASTERLY WINDS MAY RESULT IN

AREAS OF MINOR COASTAL FLOODING. AROUND 1 1/2 TO 2 FT ANOMALIES

ABOVE ASTRONOMICAL LEVELS ARE NEEDED. FOR MODERATE CSTL

FLOODING...2 TO 3 FT ARE NEEDED. VERY LOW CONFIDENCE IN MODERATE

BENCHMARKS BEING REACHED IN THE MORNING.

FOR THE SATURDAY NIGHT HIGH TIDE CYCLE...ASTRONOMICAL TIDE LEVELS

ARE ABOUT A HALF A FOOT LOWER THAT THE MORNING HIGH TIDES.

HOWEVER...STRONG NORTHEAST WINDS THAT WILL BE WELL UNDERWAY WILL

PILE WATER ALONG OUR SHORES...AND LARGE ANOMALIES ARE EXPECTED.

AROUND 2 TO 2 1/2 FEET ABOVE ASTRONOMICAL ARE NEEDED FOR MINOR CSTL

FLOODING...AND 3 TO 4 FT ABOVE ARE NEEDED FOR MODERATE CSTL FLOODING.

AT THIS TIME...MAINLY MODERATE COASTAL FLOODING IS EXPECTED.

CANNOT COMPLETELY RULE OUT A FEW LOCATIONS REACHING MAJOR

FLOODING...BUT CONFIDENCE IS TOO LOW IN THIS OCCURRING. WILL

CONTINUE TO MONITOR.

BY SUNDAY MORNING...THE STORM WILL BE PULLING AWAY AND WINDS SHOULD

BACK TO THE NORTH...WHICH IS NOT AN IDEAL WIND DIRECTION FOR COASTAL

FLOODING. RESIDUAL CSTL FLOODING IS POSSIBLE SUNDAY MORNING...BUT

STILL PLENTY OF UNCERTAINTY THIS FAR OUT WITH LITTLE AVAILABLE

GUIDANCE.

&&

.OKX WATCHES/WARNINGS/ADVISORIES...

CT...NONE.

NY...NONE.

NJ...NONE.

MARINE...SMALL CRAFT ADVISORY UNTIL 4 PM EST THIS AFTERNOON FOR ANZ350.

&&

$$

SYNOPSIS...MALOIT/DW

NEAR TERM...DW

SHORT TERM...MALOIT

LONG TERM...DW

AVIATION...JC

MARINE...MALOIT/DW

HYDROLOGY...MALOIT/DW

TIDES/COASTAL FLOODING...PW

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I'd rather be in Long Beach than north of I-84 for this storm so far, for sure. They aren't out of the woods yet, but if models tonight and tomorrow 12z don't shift in their favor, I'd say they're done for anything more than a few inches.

I think this is really shaping up like 2/5-6/10 except this time we are on right side of the line. I think being in the far SW portion of the Upton area means it could be the south shore of nassuas time to shine

And a good thing for us as well this only looks like a moderate coastal flood and beach erosion event. Flooded streets but not houses except maybe the lowest areas where many houses have been raised or condemed

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I could be wrong, hope I am wrong but you can see how with each passing run, the globals are becoming more and more progressive. Despite the low cutting off, the base of the ridge is flattening which allows the ULL to slip East instead of stalling near the Delmarva like it was doing this time yesterday. I am fairly certain that this a direct result of the strong El Nino flow which is sending another piece of energy right into the Pacific which is causing the ridge out West to collapse. Unless something drastically changes I think this one is mostly a miss, even for the coast. The flow is just too progressive and you can see it becoming more and more so with each passing run. The strong Nino wins again. The 18z GFS pretty much matches up with the 12z GEFS mean.

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Yeah, but looking at 700, youd have to think there would be more NW precip.

The mid-level jet would need to stretch back towards State College like it had been showing. The problem is that the progressive flow is weakening the ULL and by the time things get cranking things are just a hair too far East.

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