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December Pattern Disco- 2013


Damage In Tolland

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To be fair, the Atlantic has blown all through November. This pattern needs the pacific or we're toast.

4 sure. I could be wrong but does the Atlantic not at least temporarily improve around the Dec 10th timeframe period with heights in the Azores not terribly different from heights up in Iceland? I know the gfs 500 maps showed that a couple of days ago but i havent checked since.

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To be fair, the Atlantic has blown all through November. This pattern needs the pacific or we're toast.

yep.

 

one thing though that has appeared on some guidance is a hint...albeit rather weak...of some ridging bumping into eastern greenland, and basically pinning the PV far enough south to keep the cold close enough by to avoid prolonged roasting. 

 

we'll see. 

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Would you consider that a big epo reload?

 

It's a little west of a true -EPO, but the op is a sure reload of that ridge.

 

The GFS op at the time range is basically a version of the Damage in Tolland model combined with the TorontoBlizzard ensemble anyways. I just pointed it out because it was interesting to see.

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Would you consider that a big epo reload?

It's a little west of a true -EPO, but the op is a sure reload of that ridge.

The GFS op at the time range is basically a version of the Damage in Tolland model combined with the TorontoBlizzard ensemble anyways. I just pointed it out because it was interesting to see.

Just like the one eyed monster from 2 years ago, that ridge doesn't want to leave. Could be fun.

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GEFS did lower heights a bit, but the result wasn't much if any change. The day 10 period that Phil mentioned was cold. A piece of the ridge in AK broke SE and helped push the cold SE a bit.

Have to admit that is one robust ridge out in the Pacific. I'm just worried if it retrogrades more, we will torch. It's a fact there is no cooperation from the Atlantic although yesterday's Euro ensembles hinted at that. Let's hope that continues today. Second week of DEC the entire US is cold...I must say I'm impressed.

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Just like the one eyed monster from 2 years ago, that ridge doesn't want to leave. Could be fun.

Agree. That ridge has been so persistent and we could thank a warm GOA for that. If we can get a -NAO to team up with that ridge, all hell would break loose. It's still early yet but this is a totally different pattern than what we have seen in the last several years.

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It's still early yet but this is a totally different pattern than what we have seen in the last several years.

If we had a sustained period of blocking for large parts of jan/feb i think most LR forecasters would jump into nearest hole. I must say i am sold on the +AO. The work of not only Cohen but particularly Riccardo has me thinking its pacific or bust most of year. Until that work i didnt have min faith in LR teleconnector forecasting.

Being said, obv we must have some times of transient blocking as well as (at least "some times" of +EPO) if the EPO performs as well as the AO is suppose to be "bad", then i would say most likely colder than normal w prob near normal snowfall being most likely. (Thou w stellar timing and march blocking we could see more above normal chances increase). And obviously vice versa wrt to chance of pacific going to crap. My best call right now for Boston seasonal snowfall would be 30".

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