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January 2023


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7 minutes ago, LongBeachSurfFreak said:

Exactly. We need a full scale PV disruption to shake things up if we want to see a snow pattern. It’s not impossible but we could just stay like this the rest of the winter for a 11/12 type scenario. 

IMO if this pattern persists it will be far more disappointing than 11/12.

We did not strike out in a good pattern like this past December, and we had a 4 to 8 inch snowstorm January 12.

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27 minutes ago, EastonSN+ said:

If we want to be snowfall optimistic, just think that if December 2020 failed like this last December, then we would be in the exact same boat statistically (i.e Decembers with no accumulating snow) and that historic February would have still occurred. 

That's why while helpful, statistics do not always tell the full story.

Same could be said about the December 2000 storm to a certain extent.

Sure we may get shut out the rest of the way, but I doubt it.

getting shut out is tough...even the awful winter of 97-98 had a surprise 5 inch slopstorm in late march to ruin the futility record...

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Given the active train of waves, I’m still thinking we’ll avoid a complete shutout. It’s the only thing keeping us even slightly in the game right now it looks like. Regardless, seems unavoidable that we’ll be sweating temps unless something really comes together perfectly, but at least there’s stuff to watch. 

Small victories?

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35 minutes ago, CIK62 said:

Let me confuse things.    PS    JB sleeps with the CFSv2 and never saw a pattern that did not remind him of another pattern.      He says this will happen:

rrwt-1115-nh-tmp.png

Almost certainly, the RRWT map will be wrong. It frequently dumps the Northern Hemisphere's cold into North America. Its current 6-10 day outlook provides a good illustration of that tendency.

image.png.e25405217722bbb8cf2fd2251e0635a5.png

The 6-10 day period will likely be cooler than the first week of January, but there remains little support for a cold outcome. The EPS and GEFS are in very strong agreement that temperatures will descend closer to normal but the overall 6-10 day period will be warmer than normal.

I suspect that the problem with the RRWT tool is that it treats all Rossby Waves alike. Instead, origin and duration matter. From a recent paper:

Higher than normal medium-range skill scores are often associated with the presence of long-lasting RWPs (about 8 days) in the initial conditions, very often triggered far away in the west Pacific (RWP_pac_eu). Bad medium-range skill scores are instead associated with shorter RWPs coming from central US or the west Atlantic. The analysis of probabilistic skill scores also supports an increase in predictive skill associated with long RWPs coming from the west Pacific, even at longer ranges, with better skill up to week 3, suggesting a possible link with MJO events.

 

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December featured the 2nd strongest Greenland blocking at 500mb just behind 2010. The previous 2nd strongest was 1978. This is the first time such strong Greenland blocking became so south based and linked up with the SE Ridge at times. 
 

98F4CE02-5E8A-4E1C-843C-FE04D53E0DBF.png.36cc5d4780555e1106d218fbcc777b21.png
 

3087A7B1-7A4D-4214-A65E-D8E4719C0A64.png.84b7574e9b9c18dcd638bd52753c6a8d.png


E7E211A2-2BC8-4278-A70D-2BB73EBD502C.png.e7a31e570b265a6be28b9f09348fe1b7.png
06829CE5-2736-44A5-9BAE-660981B3590D.png.a6f073088cfe0602a55a2cd725d14616.png

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