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Dec 8th - 9th (2nd wave/winter storm discussion)


Zelocita Weather

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12 Z ECM Data 

Hr 36 540 line central PA west to east and light precipitation over the region 

Hr 42 540 line Northern PA with Light QPF over the region . SE PA thicknesses 546-552

Hr 48 540 line Central NY .. Thicknesses elsewhere 540 + to 558 SE PA and SNJ . Light QPF across east central PA and NE PA and NW NJ . Moderate over SE PA and heavy south of the PA border and SNJ..
HR 54 Light QPF over East Central PA light to moderate over SE PA . 540 Line in NNE thicknesses elsewhere 546-558

Surface Temps 

Hr 36 20s to mid 30s (Mid 30s LI) 
Hr 42 20s inland Mid 30s LI and lower 40s right along the immediate jersey coast
Hr 48 Mid 30s NW burbs of PHL low 30s east central PA ..Upper 20s NE PA /NW NJ ..40s East Central Jersey South and LI

Hr 54 Everyone is above freezing ...

In summary a very light QPF event is being shown on the ECM. Not nearly as robust as the GGEM...

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12 Z ECM Data 

Hr 36 540 line central PA west to east and light precipitation over the region 

Hr 42 540 line Northern PA with Light QPF over the region . SE PA thicknesses 546-552

Hr 48 540 line Central NY .. Thicknesses elsewhere 540 + to 558 SE PA and SNJ . Light QPF across east central PA and NE PA and NW NJ . Moderate over SE PA and heavy south of the PA border and SNJ..

HR 54 Light QPF over East Central PA light to moderate over SE PA . 540 Line in NNE thicknesses elsewhere 546-558

Surface Temps 

Hr 36 20s to mid 30s (Mid 30s LI) 

Hr 42 20s inland Mid 30s LI and lower 40s right along the immediate jersey coast

Hr 48 Mid 30s NW burbs of PHL low 30s east central PA ..Upper 20s NE PA /NW NJ ..40s East Central Jersey South and LI

Hr 54 Everyone is above freezing ...

In summary a very light QPF event is being shown on the ECM. Not nearly as robust as the GGEM...

ecmwf_snow_24_east_8.png

At 42 hours the 12z Euro , prints out .02 of liquid  at 10 to 1  ratio on the New Jersey shore , 850`s are minus 1 and temps the surface is  35 degrees .

It`s likely there will not be 2 inches of snow in Colts Neck as depicted  , but at 42 hrs its not in low 40`s there . 

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ecmwf_snow_24_east_8.png

At 42 hours the 12z Euro , prints out .02 of liquid  at 10 to 1  ratio on the New Jersey shore , 850`s are minus 1 and temps the surface is  35 degrees .

It`s likely there will not be 2 inches of snow in Colts Neck as depicted  , but at 42 hrs its not in low 40`s there . 

post-342-0-85502600-1386442851_thumb.png

 

Look closely along the immediate southern Jersey coast-low 40s

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I just don't see it....

 

Upton :

 

WEATHER THROUGH THIS TIME PERIOD WILL BE CONTROLLED BY THE POLAR
VORTEX OVER HUDSON BAY...WHICH WILL ROTATE A SERIES OF SHORTWAVES
THROUGH THE NORTHERN US. MODELS IN DECENT AGREEMENT WITH ONE OF THESE
SHORTWAVES PHASING WITH A SHORTWAVE EJECTING OUT OF THE WESTERN
US...RESULTING IN A DEVELOPING LOW PRESSURE SYSTEM AFFECTING THE
REGION WITH A WINTRY MIX OF PRECIP SUNDAY NIGHT INTO MONDAY
MORNING. BASED ON CLOSELY CLUSTERED CONSENSUS TRACK OF A DOUBLE
BARRELED COASTAL LOW...A TRANSITION TO RAIN WOULD BE EXPECTED
ALONG THE COAST BY MONDAY MORNING. ACROSS INTERIOR
AREAS...PARTICULARLY NW ZONES...A FEW INCHES OF SNOW AND SLEET ARE
POSSIBLE WITH EVEN A BRIEF TRANSITION TO FREEZING RAIN WITH A BIT
OF COLD AIR DAMMING. SREF PLUMES INDICATING A MEAN OF 3 TO 4
INCHES ACROSS FAR NW ZONES
...WITH GENERALLY AN INCH OR LESS FOR
CITY COAST...WHICH MAY BE A GOOD BLEND BETWEEN COLDER ECMWF AND
WARMER GFS. THIS SHOULD MAKE FOR A WINTRY MORNING COMMUTE FOR
INTERIOR AREAS...WHILE AT THE CITY/COAST ROADS SHOULD MAINLY BE
WET WITH RAIN AND RISING TEMPS.

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I just don't see it....

 

Upton :

 

WEATHER THROUGH THIS TIME PERIOD WILL BE CONTROLLED BY THE POLAR

VORTEX OVER HUDSON BAY...WHICH WILL ROTATE A SERIES OF SHORTWAVES

THROUGH THE NORTHERN US. MODELS IN DECENT AGREEMENT WITH ONE OF THESE

SHORTWAVES PHASING WITH A SHORTWAVE EJECTING OUT OF THE WESTERN

US...RESULTING IN A DEVELOPING LOW PRESSURE SYSTEM AFFECTING THE

REGION WITH A WINTRY MIX OF PRECIP SUNDAY NIGHT INTO MONDAY

MORNING. BASED ON CLOSELY CLUSTERED CONSENSUS TRACK OF A DOUBLE

BARRELED COASTAL LOW...A TRANSITION TO RAIN WOULD BE EXPECTED

ALONG THE COAST BY MONDAY MORNING. ACROSS INTERIOR

AREAS...PARTICULARLY NW ZONES...A FEW INCHES OF SNOW AND SLEET ARE

POSSIBLE WITH EVEN A BRIEF TRANSITION TO FREEZING RAIN WITH A BIT

OF COLD AIR DAMMING. SREF PLUMES INDICATING A MEAN OF 3 TO 4

INCHES ACROSS FAR NW ZONES...WITH GENERALLY AN INCH OR LESS FOR

CITY COAST...WHICH MAY BE A GOOD BLEND BETWEEN COLDER ECMWF AND

WARMER GFS. THIS SHOULD MAKE FOR A WINTRY MORNING COMMUTE FOR

INTERIOR AREAS...WHILE AT THE CITY/COAST ROADS SHOULD MAINLY BE

WET WITH RAIN AND RISING TEMPS.

that's basically this morning's discussion-I bet the 4pm update has much much less esp from NYC N and E

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This is a colder system aloft and at the surface than yesterday The development of WAA sometimes beat the models timing by a few hours and if the BL is ok u can see an inch or 2 it's plausible

 

This is going to be a major nowcasting event, the HRRR has been on a roll lately and it will be extremely useful late tonight.  I'm going with a coating-2 inches at the coast in all my forecasts emphasizing the coating is more likely but that a significantly earlier start time is possible than the near 00Z start time I'm going with.  I still am very nervous about this having serious bust potential from CNJ northward if the models are not seeing the WAA induce the precip....if the HRRR is agreeing with most of the global guidance later tonight I'll start feeling a bit better. 

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This is going to be a major nowcasting event, the HRRR has been on a roll lately and it will be extremely useful late tonight. I'm going with a coating-2 inches at the coast in all my forecasts emphasizing the coating is more likely but that a significantly earlier start time is possible than the near 00Z start time I'm going with. I still am very nervous about this having serious bust potential from CNJ northward if the models are not seeing the WAA induce the precip....if the HRRR is agreeing with most of the global guidance later tonight I'll start feeling a bit better.

NWS has updated my forcast for all rain not even a slight mix or starting as snow.. What are they looking at?

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Excuse me I mean TWC has me forcasted for all rain... This is NWS hazardous outlook

HAZARDOUS WEATHER OUTLOOK

NATIONAL WEATHER SERVICE NEW YORK NY

326 PM EST SAT DEC 7 2013

CTZ005>008-NJZ002-103-NYZ067>070-082300-

NORTHERN FAIRFIELD-NORTHERN NEW HAVEN-NORTHERN MIDDLESEX-

NORTHERN NEW LONDON-WESTERN PASSAIC-WESTERN BERGEN-ORANGE-PUTNAM-

ROCKLAND-NORTHERN WESTCHESTER-

326 PM EST SAT DEC 7 2013

THIS HAZARDOUS WEATHER OUTLOOK IS FOR SOUTHERN

CONNECTICUT...NORTHEAST NEW JERSEY AND SOUTHEAST NEW YORK.

.DAY ONE...THIS AFTERNOON AND TONIGHT.

HAZARDOUS WEATHER IS NOT EXPECTED AT THIS TIME.

.DAYS TWO THROUGH SEVEN...SUNDAY THROUGH FRIDAY.

SNOW WILL DEVELOP SUNDAY EVENING...AND 1 TO 3 INCHES OF SNOW IS

LIKELY TO ACCUMULATE BEFORE MIXING WITH SLEET AND FREEZING RAIN. A

FEW HUNDREDTHS OF AN INCH OF ICE WILL ACCUMULATE EARLY MONDAY

MORNING BEFORE PRECIPITATION CHANGES TO PLAIN RAIN LATE MONDAY

MORNING.

.SPOTTER INFORMATION STATEMENT...

SPOTTER ACTIVATION WILL LIKELY BE NEEDED SUNDAY NIGHT THROUGH

MONDAY MORNING FOR SNOW AND ICE REPORTS.

&&

THIS HAZARDOUS WEATHER OUTLOOK PROVIDES A SUMMARY OF POTENTIAL

WIDESPREAD HAZARDOUS WEATHER EVENTS THAT MAY REACH NWS WARNING

CRITERIA. MOST LONG FUSED NWS WATCHES...WARNINGS AND ADVISORIES IN

EFFECT ARE HIGHLIGHTED.

PLEASE REFER TO THE LATEST NWS FORECASTS FOR WEATHER NOT MEETING NWS

WARNING CRITERIA.

$$

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