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Wintry Winter 2021-2022 predictions

Rain Cold

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The warming event last year did those of us in the southeast absolutely no good. To me an SSW just ups the odds for extreme cold but guarantees absolutely nothing.
TW
Yeah for sure. I would honestly prefer a weaker vortex than a tightly wound one, though. We'll just have to see how it plays out. Not sure how strong it will be if/when the cold snap hits later this month. But if it's not incredibly weak and we do still go cold, that should be encouraging.
 

NickyBGuarantee

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We don’t want dry cold but we’ll take it if it comes but if we get marginal cold that’s better for snow chances around here
 

Fountainguy97

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Ok everyone I never got around to doing a full on Analog study for this winter BUT I have thrown together some stuff for us to look at today.

I haven't critiqued this as hardcore as I normally would so I'd say the room for error is on the higher side than normal, BUT this seems to be a generally good group of analogs.

First up here is a comparison of the SST average of the analogs to the last 30 days of SST. Surprisingly this group turned out to be very close to the current SST map. So we can be confident in our SST comparison. The DJF period for these analogs is a moderate Nina. Its actually a very similar global state to the current SST.
View attachment 90821


I'll spare us all the individual years and stuff. Here are the temp and 500mb analogs for DJF.

These analogs also roughly align with this years June-August temp profile. Although not perfect It is close enough IMO to consider them a good analog based off temp data.

You can see we follow a pretty classic winter pattern for the Eastern US. Mixed signal December but a cold January followed by cold Central US for February. These years all feature at least one -nao month in winter and most of them have more than that. So that similarity to last year should hold true this winter.

View attachment 90822View attachment 90827View attachment 90826View attachment 90824

No surprise our precipitation follows the standard La Nina pattern here.

View attachment 90825


One Curve Ball
These analogs have two years with extremely low hurricane ace. This doesn't seem to impact our January or February but it has some pretty serious impacts to our December when we take those two out. I'm not sure how much weight to give this so I didn't change my analog group based off it but there is a correlation in this group for high ace and a cold December. Is this just a coincidence?

View attachment 90823


And finally here are the snowfall anomalies for these years. One thing that stands out is the fact that nearly every analog features a single "big dog" across the Southern US. It seems like these analogs indicate an increased chance of a large legit southern snow storm this year.

View attachment 90828View attachment 90829


Overall I would say chances are we have a normal December, Cold January, normal to AN February with an increased chance of a widespread southern storm likely in January. This also generally matches up well with the thinking that a repeat Nina typically repeats the overall pattern of the previous one although on a muted scale. Like I said I didn't deep dive into this too much so take it for what its worth! I'm rooting for you southern guys this winter :D

My analogs are staying close in line so far with temps as we head into winter. Here is October. Warmth really pushed into the SE more than analogs but the general arrangement is good.
F23E91A7-AF92-45DB-A9A2-E10782807614.png CB1EA0AC-433D-447B-B516-DDAEB6C03A41.png

The arrangement of anomalies for November so far is scary close.

6A4FBE7E-1CAE-40EE-8903-810022EED0C3.png F18341C0-1F64-4B5D-954F-E233F443FBFA.png

A reminder my analogs are neutral to slightly AN December. Cold January. Cold shifts to central US for February. Our ACE this Atlantic season correlates to a colder December than my initial analog. So could it lean to BN? My guess is we could end up with a big cold shot at some point in December that could help us go BN slightly. Also a snowstorm could aide in December staying cooler than initial analogs.

You can see all that in the quoted post!
 
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Chazwin

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My analogs are staying close in line so far with temps as we head into winter. Here is October. Warmth really pushed into the SE more than analogs but the general arrangement is good.
View attachment 94888View attachment 94887

The arrangement of anomalies for November so far is scary close.

View attachment 94890View attachment 94889

A reminder my analogs are neutral to slightly AN December. Cold January. Cold shifts to central US for February. Our ACE this Atlantic season correlates to a colder December than my initial analog. So could it lean to BN? My guess is we could end up with a big cold shot at some point in December that could help us go BN slightly. Also a snowstorm could aide in December staying cooler than initial analogs.

You can see all that in the quoted post!
Thank you for putting these together. You’ve done a really good job with them so far
 

GaWx

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Yeah, Ventrice recently tweeted it will get strong lmao. They don’t know. I think it will end up in between them at a moderate on the ONI scale (-1.0 to. -1.4 C in Nino 3.4).

The SST peak often lags the OHC peak (peak cooling in this case). Also, as he said, SOI is moderately negative on average as it still is firmly in La Niña territory.

I reread the tweet and he (Weston) didn’t actually predict a weak Niña. I can’t tell what he’s predicting. Maybe moderate. But Ventrice clearly recently predicted strong.
 

SD

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AKA expect a blistering arctic outbreak across the East US.
I wouldn't be terribly surprised to see a period of-pna/ser or a meh -pna/-nao across the US many ninas have done so after cold in November. Biggest key to me is can we start rebuilding the pacific around Christmas.
 
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