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January 3-4 Storm Thread part II


rduwx

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2 minutes ago, Cold Rain said:

Plus, that is a pretty sizable shift west from the RGEM over 6 hours ago, unless I'm not looking at it right.

It does cut off but 6 hour to late...you can see it really cranking then too.  I would take the below snow map and run...a few hours of light snow, maybe accumulating for you.  If it closes off 6 hours earlier then shift everything west.

500hv.us_ma.png

snku_acc.us_ma.png

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1 minute ago, packbacker said:

It does cut off but 6 hour to late...you can see it really cranking then too.  I would take the below snow map and run...a few hours of light snow, maybe accumulating for you.  If it closes off 6 hours earlier then shift everything west.

That's wild! Thanks for the analysis. Amazing how just a few hours can change everything.

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2 minutes ago, packbacker said:

It does cut off but 6 hour to late...you can see it really cranking then too.  I would take the below snow map and run...a few hours of light snow, maybe accumulating for you.  If it closes off 6 hours earlier then shift everything west.

 

 

Yeah, I guess we'll take it.  It's the best we got right now.  HRRR continues to follow the NAM and lose the snow.

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After that epic run last night that put down some 20inch+ accumulations in e NC and se Va, the 3kNAM was probably just balancing things out a bit with that last run. - Upper level energy still in the GoM - weak area of low pressure off the east coast of central Fla as has been mentioned, will begin to deepen once that upper energy gets a little closer - maybe 2-3 more hours - then we will see the general direction of the slp. Right now visual presentation looks good.

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Just now, Tar Heel Snow said:

That's wild! Thanks for the analysis. Amazing how just a few hours can change everything.

That initial overrunning before the low consolidates is probably our only hope...once it fires back up it's gained to much latitude to wrap around to us.  Thats why we are seeing a dryslot, it's just when/where the low consolidates.  We would be better off with a later consolidation and dual low just running up the coast, I think.

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The combination of the dynamics kicking into high gear slightly too late as well as this bone dry air is why you are seeing the models struggle to generate as much precipitation in the Triangle region. Look at that 900-ish layer as the precip approaches on the latest HRRR. 

Is it correct? Time will tell. 

hrrr_2018010314_fh8_sounding_35.92N_78_52W.thumb.png.2d25891d6a68cf7f906a65f2feb0054e.png

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Just now, Cold Rain said:

Yeah, I guess we'll take it.  It's the best we got right now.  HRRR continues to follow the NAM and lose the snow.

I may go hit the bar early and drink myself into a coma because having to watch the radar look like this tonight will be...

get_orig_img.php?model=hrrr&run_time=14z

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I think there is still a chance for this system to over perform given the dynamics, but agree with the analysis from Pack and MSU that it is a bit of a long shot for areas RDU west due to the extremely dry air and timing of the consolidation of the slp. Still some uncertainty though and over performing is not off the table.

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7 minutes ago, Dunkman said:

Question about that HRRR sounding from RDU. Is there supposed to be an influx of drier area coming in during the day today? I mean right now RDU is I think 23/12 and that sounding has the surface at 35/7 at 22z.

Most of that drier air at the surface will be due to mixing from the mid-levels as the surface heats up this morning/afternoon.

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2 minutes ago, Regan said:

Jonathan Wall tweeted about 30 mins ago that the latest 3k Nam everyone is falling apart about its wrong if you want to go check it out. I saw that the quiet Eric Webb retweeted it. 

Why did he say it was wrong? Can you repost it here?

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58 minutes ago, Queencitywx said:

I did see that. At this point, I'd like to know if the dry air above us is as dry as the models would have you to believe. It certainly has trended more moist at the surface. 

Jeremy, 

I just peeked at the radar (after giving it a 45 minute to an hour break) and you will not believe how that sucker is turning negative and to my untrained eye appears to be tracking closer to the coast OR there is MORE precip being thrown into the mix. There is a wall of Snow INBOUND. May be a wall of VIRGA porn, but it is a start. Things are looking better by the minute, it appears. 

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