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Dec 5-6th clipper threat


George001
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1 minute ago, Prismshine Productions said:

What exactly is the Cobb method? I have seen it thrown around few times, but don't know the specifics


Sent from my SM-S146VL using Tapatalk
 

Like other methods, it accounts for temperature, moisture (relative humidity), but I believe the differentiator is it also factors in upward vertical velocity. 

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It's the extended HRRR so caution applies, however, this is an intriguing scenario. Develops a squall line which races east and then interacts with the precip shield moving across the eastern part of the region which then allows for snow to blossom region-wide around the AM commute. 

image.png.3f0fea1c9be081aea9b00932e453e16d.png

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50 minutes ago, CoastalWx said:

Strong isentropic lift and some steep lapse rates aloft so that will help offset the typical srly flow/low qpf results one would expect.  
 

So I guess the question is where roughly in longitude does this occur? Near NJ/NYC or further east?

Agree... Waiting game right now... Some consistent signals that it happens far enough east focus best rates from northeast CT on north and east into interior eastern Mass.

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1 minute ago, WinterWolf said:

Is the Euro gonna crap the bed this go around?  Either it’s gonna be right, or the more juiced up models are on to something. 

I think its more of a timing issue than anything else. The system is going to be juiced, its just a matter of how quickly does the precip shield blossom. 

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3 minutes ago, weatherwiz said:

With at least a quick glance, I'm a little shocked the Euro doesn't have more QPF during that window. Looks like it is just a tad later with blossoming things?

I’m always nervous about these late-blossoming precip shields. 
 

I made a comment a day or two ago in this thread how the precip shield is going to look ghastly until the last second. Tomorrow night around dinner time it’s going to look awful but then the stuff should really blossom…a lot of it will blossom in top of us too. But if that development is just a touch later then you are screwed and the bulk of QPF ends up east. Hopefully the short range guidance will get a good handle on it by tomorrow AM. But there’s def going to be a nowcast element to this. 

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2 minutes ago, ORH_wxman said:

I’m always nervous about these late-blossoming precip shields. 
 

I made a comment a day or two ago in this thread how the precip shield is going to look ghastly until the last second. Tomorrow night around dinner time it’s going to look awful but then the stuff should really blossom…a lot of it will blossom in top of us too. But if that development is just a touch later then you are screwed and the bulk of QPF ends up east. Hopefully the short range guidance will get a good handle on it by tomorrow AM. But there’s def going to be a nowcast element to this. 

Yeah these are certainly nail bitters. At least at this stage we have expectations for what will occur if the precip shield blossoms on the earlier side and what occurs if it happens to be on the later side. I think in terms of "gradient" from accumulation versus none is pretty set. along 84 is going to be iffy with little-to-any south and east of it. 

Not much else we can do at this stage with the blossoming aspect...nowcast for that like you said. 

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3 minutes ago, ORH_wxman said:

I’m always nervous about these late-blossoming precip shields. 
 

I made a comment a day or two ago in this thread how the precip shield is going to look ghastly until the last second. Tomorrow night around dinner time it’s going to look awful but then the stuff should really blossom…a lot of it will blossom in top of us too. But if that development is just a touch later then you are screwed and the bulk of QPF ends up east. Hopefully the short range guidance will get a good handle on it by tomorrow AM. But there’s def going to be a nowcast element to this. 

It seems like everything the last few years has been a Nowcast in some way or another…

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