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Possible 3/20-3/21 Coastal Storm


Zelocita Weather

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The GFS basically spit every possible scenario out other than a hit. I think it was doing it's usual progressive deal and more or less walked into the right idea

CRAS only slightly wavered one run where is still had the 2 rounds of precip but extrapolated past 84hrs tried to make the Sunday night coastal low the bigger deal but then immediately backed off that idea next run and held steady with its prior solutions.
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Eps and euro have 1-3 for nyc. Time to root that on. Car toppers ftw

Given the current pattern, that may the best one can hope for. A look at all of NYC's 4" or greater snowfalls that have occurred after 3/15 (1950-2015) saw 71% occur when the PNA was negative. 83% of the 6" or greater snowstorms occurred during that timeframe when the PNA was negative.

 

If one filters for ENSO Region 3.4 (anomaly > +1°C), there is a single storm in the mix: 3/22/1998. However, this time around, the trough off the west coast and the adjacent ridge to its east are forecast to be somewhat east of where they were in 1998. The ridge off Newfoundland is forecast to be quite a big weaker than it was in 1998. So, if this holds up, a track east of the 1998 one seems more likely than not.

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Given the current pattern, that may the best one can hope for. A look at all of NYC's 4" or greater snowfalls that have occurred after 3/15 (1950-2015) saw 71% occur when the PNA was negative. 83% of the 6" or greater snowstorms occurred during that timeframe when the PNA was negative.

 

If one filters for ENSO Region 3.4 (anomaly > +1°C), there is a single storm in the mix: 3/22/1998. However, this time around, the trough off the west coast and the adjacent ridge to its east are forecast to be somewhat east of where they were in 1998. The ridge off Newfoundland is forecast to be quite a big weaker than it was in 1998. So, if this holds up, a track east of the 1998 one seems more likely than not.

The PNA is the biggest problem with this. If this was positive, the storm would have most likely been closer to the coast.

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Guest Pamela

The best model (GEM LAM) still shows a moderate snowstorm per 6z...with snow still falling at the end of the run:

 

post-747-0-55074900-1458394505_thumb.gif

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Significant jump west on the 12z nam!  It just misses our area with the heavy precipitation, but certainly justifies the winter storm watch that is currently out of Taunton NWS for SE mass and the islands.    The system is much slower overall and is able to merge with the northern stream energy, but just slightly too late for NYC/LI.  Eastern LI may receive advisory snowfall if the exact NAM situation depicted occurred.  Probably 1" or so rest of LI....but this would be overnight...mainly midnight Sunday night through 9 am Monday.

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I am going to laugh if the models pull a January blizzard and start bringing this back 24 hours prior to the start of the event. The way this winter has gone nothing would surprise me.

The only concern I have is that the para Euro which is now the actually operational Euro had a noticeable flat bias in December and January before it became operational. Couple that with the often slightly displaced UKMET having something consistently, albeit ticking east the possibility still exists for something but I would be surprised if it was anything major.

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http://www.spc.noaa.gov/exper/sref/srefplumes/

The plumes are a joke. The higher totals which you say are 8 inches have snow for tonight. That's a joke. You have to look with your eyes not your heart.

for good measure the sref!.plumes have been going up since last night.several clusters at 8 or more inches for parts of n.y.c,3-5 looks good for now.

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