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I could speculate if we had the same HL configuration and Greebland block in a Nino with a more active STJ maybe things would work out better but one, I am getting ahead of myself because who knows, we might score but I also know things seem to be different now, where we are fighting a altered base state. Also, Anthony mentioned the best cold dynamics and baroclinic storm opportunities are on the other side . I have witnessed many times though that a stout NAO block and severe - AO yielded little snow but this time it's been good indices for weeks and weeks and zero snowfall. That is the first time I have seen that.

I have been reflecting and feel when we talk about threat windows, intervals of + PNA , transit ridges it really means we are in trouble. Anyone whom doubts the Pac needs to reassess in my opinion. SSWE, - NAO, - AO , - NAM state, HL blocking, etc., etc., mean nothing , all that really matters is that the Pac cooperates and that Canada doesn't torch in December. When I see some - SD deviations on the Canadian 10 mean and see the Pac improve instead or worsen only then do I feel we have a chance at something more than a pity event. Look at how this PNA has evolved.

Digital snowfall low end forecast did good so far. May escape Jan with well below normal snowfall. Also above normal temps. Boring weather ahead contrary to Accu weather's news release last week for the East. HL blocking a complete failure by itself. Southern Canada finally with normal temps , wow !

Another plus with those maps - if they are relatively close to reality storms will initially put down snow cover to our North possibly aiding with CAD and may help us eventually as the pattern progresses and the baroclinic zone shifts South.

End of the month, a couple big ones. Of course, fantasy land and beyond.

Maybe a hybrid system, I could envision an evolution towards a lower latitude grouping of lows as we near the period 26 th to the 29 th. Would be nice to see stronger Highs up in Western Canada to funnel the colder air SE

I believe this is a significant shift North on the ensembles for the 22 nd and 23 rd.

Wonder the cause? Incredible if you ask me. And, a little scary, possibly source region decay.

AO negative since December 1 st and we may go the entire month of January without a significant snowfall .

Looking like both the storm on the 22 nd and the 25 th are rain makers . Heights up in the SE US. More of the same This sucks !

I imagine this is good to know in a long term thread. The effects of the SSWE can result in both record cold and record warmth as well as Amy mentions. Example Spain and the heat in Turkey.

Some indications the NAM state may be changing towards early February. Granted, the surface reflection of the SSWE are just now progressing as HM mentioned.

Based purely off of the retrogression in NA combined with movements up top it appears a carving out from the SSWE pushes colder air our way, and very importantly the baroclinic boundary in the process, and may even amplify and increase the tendency for East coast storm genesis. When look at the loops it appears the highest probabilities for this to occur is from Jan 24 th to Jan 29 th. A cool new tool by the way from Simon

Extended blocking is a possibility. @SimonLeeWx MSLP forecasts for February-April from this month's update to the @CopernicusECMWF seasonal suite. Some suggestion of negative NAO lasting into March. Note that JMA, Météo-France, NCEP & UKMO have a weaker SSW signal because they are time-lagged ensembles. @SimonLeeWx Because of the time-lagged ensemble approach used by the Met Office vs. the "burst" approach used by ECMWF, the January C3S update of GloSea5 only had a max. ~40% probability of a major SSW, versus 100% from SEAS5. Very different tropospheric forecasts likely a result of this!

Some so called experts on other boards , not here , get pissy when you mention temps, but it so true. Source region matters despite the massive block.

Canada still above, still awaiting a change, maybe by the end of Jan.

BLOCK

BAMWX corrupted me not to ever believe a forecasted - EPO , my bad. And wow , this is nuts !

Why is this a surprise ? It has happened literally every time. And last winter too. Pac is King .

Rain at 330 hours GFS and 240 GEM. Yea I know OP at range , but we need a real game changer. Same thing last 24 months, cutter, coastal hugger or inland runner.

First time I have seen this expanse of cold over the NH this winter.

If you click on the animation and then go full screen you can see some pretty significant differences later in the forecast cycle. As Ventrice points out the GEFS is much different than the EPS north of Alaska. Focus on the evolution after hour 222. I am sure there are implications for us depending on what outcome wins out. I am guessing we would want the GEFS outcome, leading to colder air masses. T However in both loops you can see the development of the very impressive Baffin Bay block .

CPC AO forecast has trended to the Euro with 2/3 of the members going down after the initial decline that is taking place now. Also the GFS NH NAM index forecast has updated, the latest is the bottom image.

The - NAO will get a big assist going forward as Eric describes.

Can you post the EPO and the WPO from the over night Euro if possible. Thanks