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The January 5/6 Thing


stormtracker
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The storm track is really dependent on the degree of confluence up north from pieces of vorticity rotating southeastward into the '50-50' vortex. There is no HP up top to speak of. The key difference imo remains the piece of energy(vorticity lobe) in SE Canada, west of Maine. On the GFS it stretches into a vorticity ribbon as it flows into the gyre, so there isn't as much dig southward as other guidance. The Euro, CMC, and Ukie keep that vort lobe more intact/further south, increasing confluence and acting to suppress the storm track a bit more.

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24 minutes ago, H2O said:

Question. I know what happens just a little bit upstairs makes all the difference with sleet vs snow, but are we looking at a little bit different creature with this storm than most?

What I mean is we have a really fresh dump of cold air where other storms are eroding or it’s a race for a backdoor front to come in before precip falls. How much benefit is a cold column all the way down prior to stem the mid level warming due to the WAA ?

I’m generally curious what is causing the thermals to come up as much as modeled when it will be a colder storm than most times

As cold as the antecedent airmass is, there’s no man high up over New England or Ontario to push back against the WAA. And WAA usually over performs a bit too.

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2 minutes ago, MN Transplant said:

Because we are all sickos here, snow starts at midnight Monday on the 12z HRRR.  Gotta say, I'm a bit skeptical of the 30"+ projections in northeast KS.

Interesting - checked out the NWS projections in KS - see a blob of 12-18".  Drove through Kansas in 1972 after a big dump of snow and then ice.  Nothing to stop the wind out there.  Roads were a disaster. 

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Just now, Shad said:

Well the NAM is running......its finally getting into range where its somewhat useful.....remember the NAM always overdoes QPF by at least 25% so dont get too excited when you see the totals it spits out!

I know it's a bias, but I don't think we can necessarily just cut qpf because of it

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1 hour ago, CoastalWx said:

I still think nrn MD is the jack zone for now although I realize some of the guidance is south. Just going by how these trend and mid level features. We’ll see what 12z does. Either way a solid hit in the DC-BWI metro for sure. There will be a narrow area of 12+ I think. 

Sweet, thanks again for your input! 

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