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December/January 2019/20 Winter Speculation Thread


AMZ8990
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Here's a positive for you John:

giphy.gif

Now, obviously that is ONE member of 51 ensembles and exceedingly unlikely to happen, but I will say that the EPS does see a few ways (more than recently) for some cold and snow over the next 15 days, so that is a positive!

Why, even Chatt has like a 1 : 1000 shot too!

giphy.gif

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Interestingly, the operational run of the 18z GFS reversed the heights over Alaska and the ensemble reversed the heights over Greenland.  LOL.  The 12z EPS completely reversed heights over AK from beginning to end.  So, it may be that something is afoot at higher latitudes.  Lots of flip flopping usually implies a shake-up, but we will see.  If you can get your hands on the EPS mean...take a look at Alaska at 500.  Impressive change.  Other than that, lots of volatility after this cold shot during the second week of January.

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24 minutes ago, Carvers Gap said:

Interestingly, the operational run of the 18z GFS reversed the heights over Alaska and the ensemble reversed the heights over Greenland.  LOL.  The 12z EPS completely reversed heights over AK from beginning to end.  So, it may be that something is afoot at higher latitudes.  Lots of flip flopping usually implies a shake-up, but we will see.  If you can get your hands on the EPS mean...take a look at Alaska at 500.  Impressive change.  Other than that, lots of volatility after this cold shot during the second week of January.

My thinking is where the SPV is going to be is what the models are doing

gfs-ens_Tz10_nhem_33.png

AccuWeather com Professional Model Animator (5).png

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I mean we have been looking at run after run after run of huge eastern ridges...not so much.  Lots of red seemingly at high latitudes.  As an operational it is no nailed anything down yet, but seems to be a fairly strong signal  that high latitude blocking is at least "considering" a return.  The AN heights over the pole would also signal a displaced TPV.  Lots of moving parts, but glad to see the last several weeks of modeling get knocked off its spot.  Has a slight November feel to modeling without going to overboard.

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1 minute ago, Carvers Gap said:

Agree on model trust...Just speculation, but if one really wants winter, have the PV split and that piece in Quebec dive into an eastern trough.  Then we are cooking with gas.

It was transient on the run, but the +PNA and -EPO team up around 180 and the Alaska ridge shoots into the Arctic and pops a -AO. The GFS tries to go back to a western trough at the end but the Ridge is building back towards Alaska again at that point. 

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