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Monitoring first regional significant winter impact event. Magnitude likely tempered. At this time NE PA/SE NY and SNE primarily. Jan 7/8.


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1 minute ago, CoastalWx said:

Will grab a few inches after CF passes, just a matter of what happens prior. I think so too as long as it doesn’t track over the cape.

Could get nasty sunday PM....a lot of places that were getting paste will freeze pretty quickly as temps crash into the 20s.

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I think the one thing that will hold accumulation potential back a bit is the speed. This should be fairly progressive. Even if snow is lingering if we get a boost from the trailing shortwave, it's most likely going to be light snow which probably doesn't amount to much in terms of accumulation (maybe an inch or two). Overall though, the window for the heaviest snowfall rates is relatively short...maybe 2-3 hours (4 at most). Something to keep in mind when looking for the higher ceiling of totals. 

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It appears the American models are coalesced ( more than less..) overnight.  

Everything is on board and pretty well accounted for sounding-wise. This doesn't mean there won't be instra wave tussling in the trough dynamics as this open wave system cuts through, but by and large those "giga" changes won't really ( well ... "shouldn't" - famous last words!) realize much difference to the end results. 

Looks like a lower ratio snow S of HFD -NW RI to Boston and the N. Shore, with rising ratios pretty quickly in the interior.  Some rain for a time in that region, prior to subtle wind backing with deepening low, cannot be ruled out. The region from BDL CT to BED MA could be a jack pot where crossing up QPF with higher ratio/colder profile.

Both the 12km and 32km NAM are interesting at a closer analysis of their cinema of the event. After an initial WAA burst of snow there is a relaxation for 6 or so hours ...then Sunday between 12z and 18z there's coherent reinvigoration over the N-W arc of the circulation, along with both a hesitation in the sfc low, and 4 or so additional MB deepening.  This appears to coincided with the arrival of the left exit region (provided by 2ndary jet maxim) passing over the vortex and most likely causing an excitation of the ongoing event during that window...   I wonder if there is a brief pulse of wind concern coming into the coastal zones, where at that time there may be sticky snow loading and gusts to 40mph/associated CCB genesis upon exit. 

The global models may or may not illustrate that kind of discrete look as above, but the genera of the synopsis/blend/consensus are not exactly refuting what those higher resolution meso models are doing. I'm curious if the RGEM is doing something similar Sunday morning.

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wow, great reading itt. Finally the time has come for our first significant snow. Looks like there's confidence that many locations will get close to if not double digit totals. Not a bad start to a somewhat dismal season. Hopefully this opens the gates to a 100" season for all. lol

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