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Feb 17 Miller A Threat


Zelocita Weather

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21z SREF Plumes (Total Snow)

 

TTN - 9.31 in

 

PHI - 9.63 in

BLM - 8.83 in

 

EWR -8.77 in

LGA-8.64 in

 

JFK-8.52 in

 

ISP-8.78 in

 

HPN - 8.42 in

 

BDR - 7.63 in

 

Best to look at QPF and not snow. For example, those plumes give LGA 8.14" of snow on .43" QPF, which is roughly a 19:1 ratio. I don't think people should be banking on ratios quite that high, maybe 12 to 15:1, which translates to about 5-7".

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I didn't see this posted...

 

FURTHER NORTH...PRECIPITATION TYPE ISSUES BECOME LESS OF AN
ISSUE...AS A COLD COLUMN REMAINS IN PLACE. THE BEST MID LEVEL LIFT
PLACES MOISTURE INTO THE DENDRITIC GROWTH ZONE STRETCHING FROM
WESTERN NC ACROSS MUCH OF VA/MD/DC INTO SOUTHERN NJ AND PORTIONS
OF NYC AND LONG ISLAND
. GIVEN THE COLD AIR IN PLACE AND DENDRITIC
GROWTH POTENTIAL...SNOW TO LIQUID RATIOS COULD EXCEED 15 TO
1
...ESPECIALLY NORTH OF THE MASON DIXON LINE. THE TRACK OF THE
BEST MID LEVEL LIFT NORTHWEST OF THE SURFACE WAVE SUPPORTS A LARGE
AREA OF 4 TO 8 INCHES OF SNOWFALL ACROSS MUCH OF VA... SOUTHERN WV

...EASTERN MD...SOUTHEAST PA...SOUTHERN NJ ACROSS MUCH OF LI.

THERE COULD BE A SMALL AREA OF NEAR 12 INCHES OF SNOWFALL

SOMEWHERE ON THIS AXIS...AS SUGGESTED BY MEMBERS OF THE LATEST
ECMWF ENSEMBLE OUTPUT. HOWEVER...GIVEN THE SPEED OF THE MID LEVEL
SYSTEM...THIS APPEARS TO BE A LOW PROBABILITY EVENT AT THIS TIME.

 

http://www.hpc.ncep.noaa.gov/discussions/hpcdiscussions.php?disc=qpfhsd

 

http://www.hpc.ncep.noaa.gov/wwd/day2_psnow_gt_12.gif

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Best to look at QPF and not snow. For example, those plumes give LGA 8.14" of snow on .43" QPF, which is roughly a 19:1 ratio. I don't think people should be banking on ratios quite that high, maybe 12 to 15:1, which translates to about 5-7".

 

I was just about to post the same. For Poughkeepsie, it has 6.59" of snow on 0.24" of QPF for 27:1 ratios. I'm not holding my breath on that one.

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Nice 11/11/87 slash 1/26/87 by the SREFs...literally hit DC/Boston but try to avoid us.

I was thinking about 1/26/87 because 1987 wasn't a bad analog for this year...NYC picked up 4" with much more to the south...today was 4 degrees in 1987 and a southern snowstorm hit the area later in the month...NYC got 4-5" while southern N.J. got over 10"...If we see moisture from the Gulf get involved we could get 6" plus...

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Best to look at QPF and not snow. For example, those plumes give LGA 8.14" of snow on .43" QPF, which is roughly a 19:1 ratio. I don't think people should be banking on ratios quite that high, maybe 12 to 15:1, which translates to about 5-7".

 

Fair point.  My one not even really a counterpoint might be that the models might underdo the QPF.  They often do with these southern/Miller A types.  Some areas lose out to confluence, but these things are often quite moist.

 

I typically shave 1-1.5 inches off the mean plume myself anyway!

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