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October Discussion


TalcottWx

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Is there any word on the outage at NCEP?  

 

Usual confidence intervals additionally eroded until that gets resolved... of course.  But notwithstanding, yeah ... there is a bit of signal here that we confront additional storminess in the D6-9 range.  

 

The teleconnectors are also going to be impacted by data sparsity issues, ...if the outage is proven to effect ... so taken for what it is worth, there is a rather clear Archembault PNA signal here; which is to say, the strong index reversal from negative into positive. This is showing up more obviously at CDC than CPC. 

 

The Diagnostic folk calculate their PNA derivatives based upon lower troposphere mass flux (wind anomalies); whereas contrasting, the CPC calculates their using mid troposphere geopotential height anomalies.  

 

It's hard to say which is more useful.  There may even be some seasonal consideration there. I've always hypothesized that the winter, with it's stronger gradients and more "lock-and-sync" R-wave constructs around the hemisphere would argue for the CPC's method; where as in the summer, when short wave lengths and gradients construct a more nebular flow regime in general, perhaps lower fluxes may be more telling...  I dunno, but the present signal (again, notwithstanding bad inputs into the grids...) is clearer at CDC then CPC.  

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Models have at least been advertising this cold shot clipping into New England for next weekend, but the recent GFS op runs and now the Euro Op are showing it as a more widespread central/eastern cold plunge (albeit likely overdone on today's run)

 

Check out these Euro changes from prior run. No diff in New England, but elsewhere... Better prospects for a coastal now too obviously...

 

post-402-0-69504300-1414091966_thumb.png

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