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Pattern December to Remember

NoSnowATL said:
I think 1 is good for my area if I remember correctly. I know Larry has posted that snow storm per phase a few times for Atlanta.
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The most telling stat imo is the amount of major ATL winter storm activity within the COD:

- ALL 8 major icestorms and sleetstorms since the MJO history starts in 1975 were when it was in the COD! This includes the ATL icestorm that was the Carolina Crusher in 2000.
- Also, 2/11-12/2014 (which was a mix of ZR/IP/SN and I also count as one of the 8 major ZR/IP), 3/24/1983 (heaviest KATL snow since 1/1940), and 1/12-14/1982 (snowjam ‘82).
-So, a whopping 10 major ATL winter storms out of 17 since 1975 were when it was within the COD!
 
Tarheelwx said:
Isn't it all really about getting a +PNA? Otherwise, cold will be fleeting at best.

TW
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You’ll see research that shows we can get snow in any pattern. But it's going to be hard to get and stay cold with trajectories out of the SW or west. A +PNA is helpful, but like anything else, it can be muted by other things. You can have a +PNA and a mild Canada, for instance. We've certainly seen that before. But, we'd definitely take a +PNA, if it was offered to us.
 
tennessee storm said:
Good que

to many are under estimating the La Niña to begin with … I didn’t expect much this winter from the start
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This. I expected one good10-14 day window for us this season given the second-year La Nina. Maybe that window will come the first half of January?
 
No one is canceling winter just trying to pinpoint ? when I think our chances start. I always believe in winter lasting through March if it doesn’t start until February 1st oh well I’m still rooting FOR snow.
 
I would be concerned if we had that big of a temp gradient over the Midwest at the end of the GFS. What's odd is the severe weather threat that comes with it.
 
iGRXY said:
Depends on your location. Problem with a +PNA is you tend to get exceptionally cold air which means suppression city.
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The odds are significantly better with a +PNA than with a -PNA for a Miller A major SE snowstorm (little or no ZR). This allows the best chance for it to be cold enough high up enough in the atmosphere for snow. But the trough axis needs to be to the west to allow for enough moisture for major precipitation and it not be dry cold. But if we’re talking storms where CAD based ZR is a major part of it, that’s different.
 
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I'd keep an eye on what's going on just NW of Hudson Bay just west of the ridge poking in from Greenland. Gefs had more consolidation of a real pv lobe there
 
The BAMX viddy a couple pages back explained well I thought why the euro and gfs see things differently over the next 30days. Sounded like they we'll get a better handle after Monday (typhoon movement) . Be curious to see if the 2 models begin aligning more. Hopefully to a colder regime over the eastern conus than what the euro currently believes will happen.
 
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