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December 17th Clipper Potential


Radders

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A bit questionable SE of the city and near the shores..

http://www.meteo.psu.edu/~fxg1/SREF21TYPNE_3z/srefloop.html#picture

John --- any chance this thing really blows up?  Are any indiv members showing something that could lead to more or is best to just assume a nice 1-4 event or so inch area wide? 

 

WPC looks aggressive and the NAM did a farily nice job on snow amounts in this area...

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Look at the 6z 4km NAM and RGEM

Not particularly saying I agree..just noting the SREF solution. I do think this has the chance to be a solid advisory level event for most areas north of Trenton. I'll be interesting to see if some better banding can develop on Long Island and over CT into SNE once the storm gets to the coast.

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Not particularly saying I agree..just noting the SREF solution. I do think this has the chance to be a solid advisory level event for most areas north of Trenton. I'll be interesting to see if some better banding can develop on Long Island and over CT into SNE once the storm gets to the coast.

Often, I find when models show better banding or VVs over LI, the bl winds up too warm. We'll see though.

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Not particularly saying I agree..just noting the SREF solution. I do think this has the chance to be a solid advisory level event for most areas north of Trenton. I'll be interesting to see if some better banding can develop on Long Island and over CT into SNE once the storm gets to the coast.

 

I'm not sold yet on no changeover at the coast, the 06z RGEM was a nose better than the 00Z but I thought the 06Z NAM and GFS went north, especially through 24 hours over PA, they were not so much north thereafter vs. 00z...to me 4-8 weeks from now this is definitely not a changeover event because the short duration of the fetch from the SE or ESE would be over water temps in the 30s and would not warm the BL much but this time of year it may....but I still think probably only Suffolk county goes over assuming we do see mixing, I'm not sure coastal NJ sees a changeover because their surface winds may be more SSW

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06z Gfs has the entire tri-state with .25, CNJ through NYC, LI Northwards with a .5 swath. Will be an interesting few runs today. 

2 possibilities that have to be watched one  is a weaker system that comes through southern NJ with a lack of precip along it and south of it which also leads to the rain/snow line being further north. Number 2 is a system that gathers moisture and is a little further south across extreme southern NJ and intensifies when it hits the warmer water which will lead to higher amounts and more frozen in NYC Metro - just have to wait for future model runs to get a handle on these possibilities...

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2 possibilities that have to be watched one is a weaker system that comes through southern NJ with a lack of precip along it and south of it which also leads to the rain/snow line being further north. Number 2 is a system that gathers moisture and is a little further south across extreme southern NJ and intensifies when it hits the warmer water which will lead to higher amounts and more frozen in NYC Metro - just have to wait for future model runs to get a handle on these possibilities...

That 6z qpf analysis was incorrect btw. Everyone gets .10 with .25 extending from the central jersey shore to NYC and east.
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The track shifted a little too far north with a mild onshore flow as the best UVV's pass over us.

Im inclined to wait for the new NAM, SPC WRF, RGEM and high res models before declaring this dead at the coast. It's an advisory level snowfall for much of Northern NJ regardless...near the coast obviously a lot more variability based on track.

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Is the flow that strong off the water that it will scour out all the cold air that will be draped over the coast tomorrow morning?

Yes. Winds turning south will do away with any cold air very fast. We all learned this the hard way two nights ago. This is what we can continue to expect as long as there is no blocking northeast of us.

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Yes. Winds turning south will do away with any cold air very fast. We all learned this the hard way two nights ago. This is what we can continue to expect as long as there is no blocking northeast of us.

 

That was a strong coastal front. I don't think we can really compare the two.

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