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Jan 4th 2018 Fish Bomb


Rjay

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23 minutes ago, Stormlover74 said:

Rgem through 7am. Hopefully that heavier stuff comes right up the coast

 

rgem_asnow_neus_48.png

Based on the GGEM it probably doesn’t.  We see the same thing where ACY and places like SBY see more as that back edge “dies” but it’s probably still a 5-8 inch snow near nyc with 14-16:1 ratios

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13 minutes ago, Nibor said:

Ggem continues to show an expansive precip shield. The SLP is east of the benchmark but precip makes it back to central PA. 

It may have the best handle on the precip shield out of all the globals. That cutoff further north is due to the kick east that the models show, which is questionable right now.

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There is probably a sweet spot somewhere for the metro in this event where we are close enough for decent snow amounts but not close enough for the winds to destroy the ratios.  Somewhere in between will get 15-20:1 ratios while east of there a bit may be 10-11:1 and still not in the very high QPF 

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It may require additional time before the guidance moves into general agreement. The possible difficulties among the global models and big differences with the mesoscale models may well be the result of a complex phasing situation with which the guidance has noted difficulty in the medium range. From Kocin, Uccellini et al. on the December 2010 Boxing Day blizzard:

The entire suite of European, Canadian and U.S. models didn’t converge on the correct forecast scenario until 36 to 48 hours prior to the onset of the heaviest snow, generally late on the 24th through early on the 25th.  Furthermore, the significant model differences on 24 December 2010 contributed to forecaster uncertainty...  It wasn’t until the 1200 UTC 25 December model cycles that all the models converged on a solution that put New York City squarely in the area of heavy snowfall and blizzard conditions on 26 December...

...we do note that this case was marked by the complex phasing of different short-wave upper-level troughs upstream of the cyclogenetic event.  These phasing characteristics are a marker for La Nina patterns which existed for the Winter 2010/2011, which are known to be particularly difficult to forecast with certainty in the medium range.

http://www.wpc.ncep.noaa.gov/winter_storm_summaries/event_reviews/2010/December25_27_2010_Blizzard.pdf

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