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Late Weekend Storm Threat


IsentropicLift

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so that would be for Sunday night into Monday I'm guessing in which case we are starting to develop consistency

Yes, sunday into Monday. The 1st wave is more north than the 2nd wave and just gives NYC some light snow with more to the north. The 2nd wave gets the City pretty good.It snows from hour 84- 132 from NYC northward

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Yes, sunday into Monday. The 1st wave is more north than the 2nd wave and just gives NYC some light snow with more to the north. The 2nd wave gets the City pretty good.It snows from hour 84- 132 from NYC northward

48 hrs. I'm sure that's off and on but the one constant has been the length of the storm. I'll sign up for that even if its under foot
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Upton:

.LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/...

FAIRLY GOOD AGREEMENT IN THE LONG TERM WITH A COLD FRONT APPROACHING

THE AREA FRIDAY NIGHT AND THEN MOVING THROUGH LATE SATURDAY INTO

SATURDAY NIGHT. IT WILL THEN STALL WELL SOUTH OF THE AREA...AND A

WEAK LOW PRESSURE SYSTEM WILL DEVELOP ALONG THE FRONTAL BOUNDARY OFF

THE MID-ATLANTIC COAST ON MONDAY. IT WILL THEN HEAD NORTHEAST

PASSING WELL SOUTH AND EAST OF LONG ISLAND BY TUESDAY. THERE IS THE

POTENTIAL FOR 6"+ OF SNOW. HOWEVER...THIS WILL FALL OVER AN EXTENDED

PERIOD OF TIME...FROM SATURDAY NIGHT THROUGH MONDAY NIGHT. THERE IS

UNCERTAINTY WITH QPF...AS THE 00Z GFS HAS ABOUT HALF AN INCH LESS

QPF THAN THE 12Z ECMWF. THIS MAY BE DUE TO THE STRENGTH OF THE H5

TROUGH...WHICH IS WEAKER IN THE GFS THAN THE ECMWF. THIS WOULD LEAD

TO A WEAKER SURFACE LOW. THE TREND HAS BEEN TO WEAKEN THIS TROUGH

FROM RUN TO RUN IN BOTH MODELS. MORE CONFIDENT THAT PRECIPITATION

TYPE WILL BE ALL SNOW EVERYWHERE.

rolleyes.gif

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Upton Just updated their AFD a few minutes ago - IMO throwing around snow totals in this very complex setup this early is nonsense . They are once again leaning heavily on the GFS which give close to 0.90 total qpf

 

143  

FXUS61 KOKX 051221  
AFDOKX  
 
AREA FORECAST DISCUSSION  
NATIONAL WEATHER SERVICE NEW YORK NY  
721 AM EST THU FEB 5 2015  
   

   
LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/
 
 
FAIRLY GOOD AGREEMENT IN THE LONG TERM WITH A COLD FRONT APPROACHING  
THE AREA FRIDAY NIGHT AND THEN MOVING THROUGH LATE SATURDAY INTO  
SATURDAY NIGHT. IT WILL THEN STALL WELL SOUTH OF THE AREA...AND A  
WEAK LOW PRESSURE SYSTEM WILL DEVELOP ALONG THE FRONTAL BOUNDARY OFF  
THE MID-ATLANTIC COAST ON MONDAY. IT WILL THEN HEAD NORTHEAST  
PASSING WELL SOUTH AND EAST OF LONG ISLAND BY TUESDAY. THERE IS THE  
POTENTIAL FOR 8"+ OF SNOW.
HOWEVER...THIS WILL FALL OVER AN  
EXTENDED PERIOD OF TIME...FROM SATURDAY NIGHT THROUGH TUESDAY. IF  
THE MODELS CONTINUE TO SHOW THIS EXTENDED PERIOD OF  
SNOW...QUESTION REMAINS AS TO WHETHER WE RECEIVE 8"+ IN A 24 HOUR  
PERIOD TO CONSIDER WATCHES/WARNINGS OR ADVISORIES IF IT FALLS IN  
A PERIOD LONGER THAN 24 HOURS. THERE IS UNCERTAINTY WITH QPF...AS  
THE 00Z GFS HAS ABOUT HALF AN INCH LESS QPF THAN THE 12Z ECMWF.  
THIS MAY BE DUE TO THE STRENGTH OF THE H5 TROUGH...WHICH IS WEAKER  
IN THE GFS THAN THE ECMWF. THIS WOULD LEAD TO A WEAKER SURFACE  
LOW. THE TREND HAS BEEN TO WEAKEN THIS TROUGH FROM RUN TO RUN IN  
BOTH MODELS. MORE CONFIDENT THAT PRECIPITATION TYPE WILL BE ALL  
SNOW EVERYWHERE.  
 
HIGH PRESSURE BUILDS IN AT THE SURFACE TUESDAY NIGHT...WITH A WARM  
FRONT APPROACHING THE AREA ON WEDNESDAY.  
 

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Upton Just updated their AFD a few minutes ago - IMO throwing around snow totals in this very complex setup this early is nonsense . They are once again leaning heavily on the GFS which give close to 0.90 total qpf

 

143  

FXUS61 KOKX 051221  

AFDOKX  

 

AREA FORECAST DISCUSSION  

NATIONAL WEATHER SERVICE NEW YORK NY  

721 AM EST THU FEB 5 2015  

   

   

LONG TERM /FRIDAY NIGHT THROUGH WEDNESDAY/  

 

FAIRLY GOOD AGREEMENT IN THE LONG TERM WITH A COLD FRONT APPROACHING  

THE AREA FRIDAY NIGHT AND THEN MOVING THROUGH LATE SATURDAY INTO  

SATURDAY NIGHT. IT WILL THEN STALL WELL SOUTH OF THE AREA...AND A  

WEAK LOW PRESSURE SYSTEM WILL DEVELOP ALONG THE FRONTAL BOUNDARY OFF  

THE MID-ATLANTIC COAST ON MONDAY. IT WILL THEN HEAD NORTHEAST  

PASSING WELL SOUTH AND EAST OF LONG ISLAND BY TUESDAY. THERE IS THE  

POTENTIAL FOR 8"+ OF SNOW. HOWEVER...THIS WILL FALL OVER AN  

EXTENDED PERIOD OF TIME...FROM SATURDAY NIGHT THROUGH TUESDAY. IF  

THE MODELS CONTINUE TO SHOW THIS EXTENDED PERIOD OF  

SNOW...QUESTION REMAINS AS TO WHETHER WE RECEIVE 8"+ IN A 24 HOUR  

PERIOD TO CONSIDER WATCHES/WARNINGS OR ADVISORIES IF IT FALLS IN  

A PERIOD LONGER THAN 24 HOURS. THERE IS UNCERTAINTY WITH QPF...AS  

THE 00Z GFS HAS ABOUT HALF AN INCH LESS QPF THAN THE 12Z ECMWF.  

THIS MAY BE DUE TO THE STRENGTH OF THE H5 TROUGH...WHICH IS WEAKER  

IN THE GFS THAN THE ECMWF. THIS WOULD LEAD TO A WEAKER SURFACE  

LOW. THE TREND HAS BEEN TO WEAKEN THIS TROUGH FROM RUN TO RUN IN  

BOTH MODELS. MORE CONFIDENT THAT PRECIPITATION TYPE WILL BE ALL  

SNOW EVERYWHERE.  

 

HIGH PRESSURE BUILDS IN AT THE SURFACE TUESDAY NIGHT...WITH A WARM  

FRONT APPROACHING THE AREA ON WEDNESDAY.  

 

 

Personally, I think this is spot on.  It is in the AFD which is read by enthusiasts only and uses the word potential.

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Personally, I think this is spot on.  It is in the AFD which is read by enthusiasts only and uses the word potential.

ok we will see how spot on it is at verification time -which BTW is still 5 days away- also what happens if during the next couple of sets of model runs the qpf gets cut back ? Upton flip flopping time just like they did with the last storm mentioning accumulations several days in advance.

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