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Baroclinic Zone

December 5-6, 2020 Storm Observations and Nowcast

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Okay... it's been a fun progression this morning ... really definitive almost 'staging' to this event.   But as of this hour ( 11 am and ticking on ...) we have commenced substantive and more obvious real accumulating. 

How's the RGEM doing ...lol.   You know, in a way we are like "snow storm scatologists" as the event poops out aggregate structures, we sift through them to determine the vitality of "snow" health...

Let me tell you something .. it ain't in favor of the pallid RGEM solutions - holy smokes.  If anything, this is ahead of schedule and vastly more aggressive than - at least for me, admittedly ... - my own interpretation of how this event would unfold.  Right now it is 33 F here, with uniform small to mid -sized aggegates, and everything exposed is/has turned white ... Interestingly, the streets are slushed over and whitening at the same rates as the grass  -..kind of interesting. I think the cold rain predawn sapped the streets of lay-over heat and so they were more primed and ready to cryo -

Anyway, the snow health of this thing here at 200 foot elevation in the Nashoba Valley is very, very good!  The scenery around the land-scape on me geek drive.. it looks like deep winter rather abruptly... It didn't 'flash' in the stricter 'subjective' definition of that sort of phenomenon... but pretty dern close!  

So quick recap:   

7:45 am, straight rain at dawn... 40 F ... One could almost imagine a 'fat' rain drop zipping down here and there and in fact, the particle size was large.   

8:45 "    , cat pawing/white rain 39 F ...

9:00 "    , cat pawing with occasional larger aggregate vestiges 38 F

9:30 "   ,  cat paws, large aggregates more common  37 F

10:   "   ,  large aggregates predominate.. but irregular intensity intervals.  37 F

10:30  ,  massive griddle cake aggregates and secondary aggregate bundles/truly enormous. One particle IS a winter storm warning.... ( jesus) First sign of visibility restriction... 36 F

10:45      ,  Vis 1/2 mi in pounding thumpers... aggregate and aggregate bundles begin falling slower, ..abruptly, smaller sizes commence 34F

Now ... 11:30,  vis 1/4 to 1/2 mi, uniform small to mid size aggregates are completely anti RGEM implicating ( heh..)... 1/2" accumulation but uniform cling to everything... 33 F but some networked home stations putting out 31 and 32s within 5 miles so...I think we're getting some thermal lag in a rapidly cooling column type deal...

It looks like a heavy snow storm out side, period -

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51 minutes ago, MarkO said:

Southern edge of white mountains. Hills/mountains all around me. BobButts just being a tool.

No one is flying that low today there. An instrument flight rule day anyway 

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8 minutes ago, DavisStraight said:

35 and flipped back to rain 

Fighting midlevel temps there but it should go back to snow soon. You can see the CC collapsing back SE in the last couple frames. 

Meanwhile, getting blitzed in ORH 

image.jpeg.a5c0b1b96043cc35615c5ed11fd1dcfd.jpeg

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6 minutes ago, BuildingScienceWx said:

Snow growth went from great to not to much pretty quick. This thing is winding up, excited for you guys to the NE.

What is that structure curling S of Montauk? Mesolow?

RAD_KOKX_N0R_ANI 1137.gif

OMG, look at the cons head forming from Bridgeport, CT curling down.  

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3 minutes ago, GCWarrior said:

Raining here.  No surprise.

What town are you in?

Edit: Never mind, I saw you were in Buckland. I forgot I had another Franklin County neighbor on the board now! 

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back in Shrewsbury for this one and def a lot of variance locally due to elevation .. only a coating so far imby at about 420', but at least an inch down at the center of town closer to 700' as of 11. Flipped to snow on the drive back at the rt 9 / 495 intersection at ~10:45. A little frustrating knowing just up the street from mby there's more snow on the roads then I have on the grass here :lol: 

seems like ~600'+ locally is the magic #

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6 minutes ago, ORH_wxman said:

Fighting midlevel temps there but it should go back to snow soon. You can see the CC collapsing back SE in the last couple frames. 

Meanwhile, getting blitzed in ORH 

image.jpeg.a5c0b1b96043cc35615c5ed11fd1dcfd.jpeg

The complexion of this down here even in the valley is starting to look that way, Will -

it's interesting ... elevation doesn't "seem" as important as the dynamics for this ... I mean the top-down cooling part of this seems to completed for our region of NE/N Middlesex Co

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