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November II Discussion


CapturedNature

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The past several GEFS runs have definitely shown this gradient pattern with high heights in the south and plenty of cold in Canada as we head towards December. But we might see some NW flow in the Plains, which is def not a torch pattern and we'd get into the cold at times. The superanalogs don't show that, but the 00z and 06z GEFS did. Plus as others have said there is still ridging in some of the EPO regions. 

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The 00z operational Euro was very precariously close to a fuller phase and the differences in sensible impact from the N. M/A to NE regions would be immense for D6'ish.  This event (or lack there of..) was heavily hinted yesterday; tho for me it was less impressively support in the tele/mass field observations...  

 

The trick there is to remember ...that's "modeled", not what's actually going to happen.  Heh, the rub - 

 

Anyway, the Euro's correction for that particular time range is flatter usually... That doesn't lend much to support a more phased result. I am not sure what goes into the "parallel" run of the GFS (hoping it is not the "paranormal" run!), but upon seeing it's BM sort of text-book looking moderate cold profiled nor'easter, does give some nod back to that precarious appeal.  

 

I suppose that just because a model has a noted bias ... doesn't mean the bias applies at all times.  

 

So yeah, lots of moving part in the philosophy for that mid-extended range currently.  It's akin to transition season, which I am still seeing an abundance of larger mass-field discontinuities ...obviously not lending to forecaster confidence at any temporality beyond a couple days. 

 

By the way, I don't see any mode shift away from a cold N/A regime...  The warm-up for a couple days early this week is "relaxed" in character.  I'm seeing a huge amount of cold charging/dump off an -EPO that quite frankly looks akin to much of what took place last winter. In fact, the NP is clearly supporting the -EPO, as it has since last December.  (PDO related?  interesting question...).  Whatever, the CDC monitoring of the teles have the WP relay into the EPO quite indicative of higher latitude ridge nodes and subsequent hemispheric cold conveyors seem likelier.   So seeing the operational guidance loading the Can shield with large spatially involved sub -20C 850s appears reasonably well correlated. 

 

Cold, period.   This may have been covered -- I haven't had the time to languish in 50 pages of posting as of late... But that warmth is probably more aligned with the fact that at temperate latitudes, ...it pretty much can't stay hot or cold biased all the time, and less symptom of a mode change.  'Sides, we always had an expression at school that seemed to work better than 50% of the time:  When the baseline is cold, and it tries to get warm, BOOM...  So, clearly our resting state is colder (relative to the longer term warm climate; but that's a different discussion); any balm injected in may precede a restoring event (pseudo Archembaultian). 

 

In short, chilly, balmy, back to chilly, look for Thanks Giving week event.  

 

Also, I don't see that -PNA as a major disruption giving to the  -WP/-EPO over top.  If anything, that visualizes storminess because you're cold loading continues and the Pac might inject dynamics in the means, coming through the west underneath.  

 

peace!

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