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January Medium/Long Range Discussion


nj2va

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2 minutes ago, Maestrobjwa said:

Now this "TPV" (what is that, btw?)...is that a bigger piece of the equation where we'll know what it's gonna do by like Tuesday or Wednesday? Or is it a feature that can't be nailed down until we get even closer?

The tropospheric polar vortex or the big blue ball @ 500mb. No chance the placement of the tpv is nailed down until into the mid range. 

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Interesting in regards to the coupling. 

re

What I notice most is the persistence of the Atlantic ridge (300-350°E), which appears to be driven by forcing in the troposphere, from the downstream impact of the amplified pattern over N America... which *is* coupled with the stratospheric vortex pattern (the Canadian vortex).

 
 
Direct message

and 

####------------------------------------ Polar vortex status ------------------------------------###

The strat. vortex is currently weaker than all other years in the ERA interim record!!! 

The zonal mean zonal wind at 10 hPa 60N is today (GFS analysis): -7.0 m/s 

Weakest zonal wind at 10 hPa 60N in ERA interim record for todays date is: -3.7 m/s 2013 

Strongest zonal wind at 10 hPa 60N in ERA interim record for todays date is: 64.6 m/s 2009 
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41 minutes ago, Ji said:
46 minutes ago, psuhoffman said:
Yea that's my take too. The pattern the next 10 days is dependent on the tpv location and where the boundary sets up.  Rain is a risk for any system that amps up to our west if that tpv isn't pressing enough.  But it can work and its active looking.
 After that as the atl ridge retrogrades into a more classic west based block we should see a more typical snow vs no type setup ala 2010.  But if we can score a couple times before then and then get that type of pattern in Feb...!!!  That's how we can make a run at the kind of winter that might even make the "I need snow in December" crew happy.  
...Naw who am I kidding 

12z gfs....not sure how to say it but it brings alot of weather

This is going to be a lot of fun...right through into March me thinks. 

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37 minutes ago, kdskidoo said:

question is, is it's replacement better or worse?

This is all just from observation but it doesn't seem to be any better in the long range and jumps around as bad as the old gfs (but that's not really the main goal of op models) but once into medium range it's been more consistent and it handles the thermal structure of synoptic systems way better. Just my 2 cents. 

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5 minutes ago, Ji said:

but in case you want too

 

Ji, you might know this already, but beyond the 240 hour mark is it crazy. One oppurtunity after another. And,what about the cold temps. I really feel we are going to break below zero at some point moving forward. 

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8 minutes ago, Bob Chill said:

@Ji fv3 is straight out of the jan/feb 2014 playbook. Progressive thump followed by arctic air. Great for glaciating and pack retention 

the models seem to have a 1-2 punch of rain/mix...then another storm forms on a front that is east of the first punch

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