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Winter 2025-26 Medium/Long Range Discussion


michsnowfreak
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The AO index has been negative since about Christmas.

The AO index isn't calculated based off temperature anomalies, but look at this plot of 1000mb heights over the Arctic Ocean vs Europe. The official calculation of the AO is based on 1000mb height anomalies (close to S.L.P. anomalies,) projected onto a loading pattern and doing the calculus.  I would call it a very negative NAO, but the CPC values aren't so negative.

 

eLbaJj4.gif

 

 

And 850mb temperature anomalies in Greenland vs Europe and the USA

 

mYa8XbR.gif

 

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I know everyone here just seems to have mood swings with each op model run but the look on the ensembles in late February doesn’t look bad to me at all. You have Canada filled with Arctic air, a -PNA and the seasonal warming in the south as we head toward March. The ingredients are there for interesting stuff IMO.

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21 minutes ago, roardog said:

I know everyone here just seems to have mood swings with each op model run but the look on the ensembles in late February doesn’t look bad to me at all. You have Canada filled with Arctic air, a -PNA and the seasonal warming in the south as we head toward March. The ingredients are there for interesting stuff IMO.

Its been a fantastic winter for cold, snowfall, and snowcover. Just need the cherry on top (big storm). Would love to see that end of Feb or Mar.

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