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January Medium/Long Range: A snowy January ahead?


mappy
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Transitioning to the long range again... the EPS shifted the trough axis east in the day 10-15 period.  The AO/NOA is relaxing but looks neutral not hostile.  The ridge does retrograde into the WPO domain, which as Chuck pointed out is not ideal, however I've noted guidance continues to indicate troughing in the central pacific underneath the WPO and EPO ridge.  This creates a significantly different effect than when the ridge in the central pacific is full latitude being fed from the tropics.  It's a much less hostile pacific look, more neutral in terms of its effects downstream on North America.  It will force the ridging to creep into western N Amer. more which prevents a god awful -PNA digging for gold down the west coast, and also directs cold shots a little further east.  

Lastly, not only is this not a hostile look IMO, but its even a pretty good one if you have cold established across N America ahead of this pattern.  In recent years when we did get a mediocre pattern it was often coming off a torch which just doesn't work...but going from a great pattern that establishes cold a mediocre longwave pattern is much more likely to produce snow.  

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6 minutes ago, pazzo83 said:

so - looks like we'll get real winter about once a decade now.

These things still run in cycles... if the AO and PDO are both going through a decadal flip right now (they could be but its too soon to say for sure) maybe we are about to head into a heater.  Of course keep expectations in check...heater periods are not necessarily what they once were, I don't think the 1800s or 1960s are walking through that door anytime soon, but we can probably pull off a run like 2003-2016 again.  

Snowfall is really fluky and we dont always end up with a big number around here even in a "real winter"  2004, 2005, 2007, 2009, 2011, 2013 were all "real winters" with periods of sustained cold and some snowfall around our area we just got unlucky and didn't score any flush hits those years.  2003, 2006, 2010, 2014, and 2015 we got the cold and the big snows.  But it felt like legit winter "most" years during that stretch unlike recent years where we spend a majority of the "winter" in a fall jacket.  

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Just a tidbit since I’m bored. Euro Ai is a really good model. Been watching it during all the events so far this winter and it’s really accurate. It seems like the graphics are like smoothed out like the old control, but I’m not exactly sure what goes into it. It’s been pretty steady with Saturday’s event outside minor ticks here and there. It seems all the models trending towards its overall H5 look. I think SE of the cities could be in store for 1-4” event with maybe far SE sections 2-5”.


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ecmwf-ensemble-avg-nhemi-z500_anom_1day-7547200.thumb.png.088a9a64b6d6f5300cb84a62407d1c98.png

2015feb.gif.604d48200b2e842f2c43a7ed1636431e.gif

 

To add visuals.  The trough under the WPO is significant and changes the equation.  If there was a ridge there like in recent years feeding a full latitude ridge into the WPO that feeds into a full latitude trough into western N America which of course leads to our out of control SER torches.  This is a different look and is likely related to the relaxation of the PDO which was why that opened the door to significantly better outcomes this winter.  

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1 minute ago, psuhoffman said:

ecmwf-ensemble-avg-nhemi-z500_anom_1day-7547200.thumb.png.088a9a64b6d6f5300cb84a62407d1c98.png

2015feb.gif.604d48200b2e842f2c43a7ed1636431e.gif

 

To add visuals.  The trough under the WPO is significant and changes the equation.  If there was a ridge there like in recent years feeding a full latitude ridge into the WPO that feeds into a full latitude trough into western N America which of course leads to our out of control SER torches.  This is a different look and is likely related to the relaxation of the PDO which was why that opened the door to significantly better outcomes this winter.  

I started beating the desk in November in the La Niña thread that the trough over or near Japan was new and would maintain the trough in the east. Still important to at least keep a ridge out of Japan if not a trough imho. Though not a trough, that 15 day map is close enough to neutral not to hurt us. 

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Just now, Bob Chill said:

Progressive NAVGEM moved towards juicier and closer to the coast. And before anyone asks.... yes, the NAVGEM is an excellent model. But only when it shows what you want

It's crazy that you're saying this, I JUST looked at it and said to myself "well, it has a progressive bias." Weenies sure think alike. I was bored in the downtime between model cycles..

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