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Possible frontal wave snow


Zelocita Weather
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9 minutes ago, eduggs said:

This event was elevationally dependent as expected because of the slope of the thermal front.  As is typical, surface cooling lagged mid-level cooling substantially.  So elevated areas changed over and began accumulating much sooner than lower areas.  And lower/coastal areas had only a brief period of accumulating snow when temps. were marginal.  The problem with the snow maps isn't an issue of "sticking" with "warm ground."  The issue is that the algorithms tally up all modeled "snow QPF" and display that total.  Snow accumulation is different than total modeled precipitation in frozen form.

Moderate snow sticks at 33 or 34F with dense overcast.  Truly heavy snow sticks at almost any realistic temperature.  But even steady light snow typically requires <33F to accomplish more than coating the cars.  And the vast majority of snow obs. are light in any given winter.

This

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000
NOUS41 KOKX 111307
PNSOKX
CTZ005>012-NJZ002-004-006-103>108-NYZ067>075-078>081-176>179-120107-

PUBLIC INFORMATION STATEMENT
SPOTTER REPORTS
NATIONAL WEATHER SERVICE NEW YORK NY
807 AM EST WED DEC 11 2019

THE FOLLOWING ARE UNOFFICIAL OBSERVATIONS TAKEN DURING THE PAST 12
HOURS FOR THE STORM THAT HAS BEEN AFFECTING OUR REGION. APPRECIATION
IS EXTENDED TO HIGHWAY DEPARTMENTS, COOPERATIVE OBSERVERS, SKYWARN
SPOTTERS AND MEDIA FOR THESE REPORTS. THIS SUMMARY ALSO IS AVAILABLE
ON OUR HOME PAGE AT WEATHER.GOV/NYC

********************STORM TOTAL SNOWFALL********************

LOCATION          STORM TOTAL     TIME/DATE   COMMENTS                   
                     SNOWFALL           OF 
                     /INCHES/   MEASUREMENT

CONNECTICUT

...FAIRFIELD COUNTY...
   DANBURY                3.7   750 AM 12/11  SOCIAL MEDIA            
   BETHEL                 3.5   700 AM 12/11  EMERGENCY MANAGER       
   WESTON                 2.6   700 AM 12/11  TRAINED SPOTTER         
   BRIDGEPORT AIRPORT     2.2   700 AM 12/11  CO-OP OBSERVER          

...MIDDLESEX COUNTY...
   PORTLAND               2.5   605 AM 12/11  AMATEUR RADIO           

...NEW HAVEN COUNTY...
   WOODBRIDGE             3.5   720 AM 12/11  PUBLIC                  
   GUILFORD               3.0   630 AM 12/11  CO-OP OBSERVER          
   HAMDEN                 2.7   730 AM 12/11  PUBLIC                  
   MILFORD                1.0   605 AM 12/11  AMATEUR RADIO           

...NEW LONDON COUNTY...
   LEDYARD CENTER         2.0   800 AM 12/11  TRAINED SPOTTER         

NEW JERSEY

...BERGEN COUNTY...
   OAKLAND                1.5   800 AM 12/11  SOCIAL MEDIA            
   RIDGEWOOD              1.0   700 AM 12/11  TRAINED SPOTTER         

...UNION COUNTY...
   CRANFORD               0.5   630 AM 12/11  TRAINED SPOTTER         
   NEWARK AIRPORT         0.5   700 AM 12/11  FAA OBSERVER            

NEW YORK

...NASSAU COUNTY...
   WOODBURY               3.0   730 AM 12/11  BROADCAST MEDIA         
   WEST HEMPSTEAD         2.0   755 AM 12/11  SOCIAL MEDIA            
   MERRICK                1.8   800 AM 12/11  TRAINED SPOTTER         
   MANHASSET HILLS        1.2   745 AM 12/11  SOCIAL MEDIA            
   VALLEY STREAM          1.1   800 AM 12/11  TRAINED SPOTTER         
   NEW HYDE PARK          1.0   540 AM 12/11  TRAINED SPOTTER         

...NEW YORK (MANHATTAN) COUNTY...
   CENTRAL PARK           0.2   700 AM 12/11  PARK CONSERVANCY        

...ORANGE COUNTY...
   NEWBURGH               2.5   745 AM 12/11  TRAINED SPOTTER         
   MONROE                 2.3   600 AM 12/11  TRAINED SPOTTER         

...PUTNAM COUNTY...
   MAHOPAC                3.5   700 AM 12/11  TRAINED SPOTTER         
   BREWSTER               3.2   755 AM 12/11  TRAINED SPOTTER         

...QUEENS COUNTY...
   NYC/LAGUARDIA AIRPOR   0.6   700 AM 12/11  FAA OBSERVER            
   NYC/JFK AIRPORT        0.5   700 AM 12/11  FAA OBSERVER            

...ROCKLAND COUNTY...
   STONY POINT            1.3   700 AM 12/11  TRAINED SPOTTER         

...SUFFOLK COUNTY...
   NESCONSET              3.0   700 AM 12/11  SOCIAL MEDIA            
   WEST BABYLON           1.0   720 AM 12/11  SOCIAL MEDIA            
   ISLIP AIRPORT          0.8   700 AM 12/11  FAA OBSERVER            

...WESTCHESTER COUNTY...
   WINDMILL FARM          2.8   730 AM 12/11  PUBLIC                  
   SPRING VALLEY          1.9   750 AM 12/11  SOCIAL MEDIA            

&&
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3 minutes ago, purduewx80 said:

Any of the brighter echoes moving through the city now are indicative of the better snow growth with forcing near 500mb. We went from white rain to large dendrites and moderate snow here in Bed-Stuy over the past 15 minutes. Moderate snow at Central Park now too.

 

Yup coming down pretty good here. Probably closing in on an inch

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4 minutes ago, purduewx80 said:

Any of the brighter echoes moving through the city now are indicative of the better snow growth with forcing near 500mb. We went from white rain to large dendrites and moderate snow here in Bed-Stuy over the past 15 minutes. Moderate snow at Central Park now too.

 

Is there a way to read this in real time? I'm only familiar with heights readings on model outputs. 

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12 minutes ago, Wetbulbs88 said:

Is there a way to read this in real time? I'm only familiar with heights readings on model outputs. 

Model analyses and short-term forecasts of vertical velocities are one way (RAP/HRRR especially), but they're subject to model depictions being correct.

RAP analyses are used in the SPC meso products - check out the winter weather and upper air sections for the relevant info.

The 12Z OKX sounding showed no dry air issues and had the dendritic growth zone centered near 500mb. So any parcels lifted from below into that layer will give you the better snow growth. 700mb (or likely just above this) frontogenesis is doing the trick now.

846081853_ScreenShot2019-12-11at9_06_22AM.png.96f21be3373da271a7a733764935d993.png

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8 minutes ago, doncat said:

1.0" here...Not a temp thing here, just less precip  fell.

I can't speak for your specific location, but surface temps. were definitely an issue (as expected) for many locations in the area based on official and unofficial obs.  Lots of 0.2 - 0.3" QPF totals with mostly sub 32F at 925mb.

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2 minutes ago, eduggs said:

I can't speak for your specific location, but surface temps. were definitely an issue (as expected) for many locations in the area based on official and unofficial obs.  Lots of 0.2 - 0.3" QPF totals with mostly sub 32F at 925mb.

Yes true...I was speaking for my station where the LE  was less than seen further east.

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