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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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Deep cold definitely eroding but per the weeklies the persistent warmth looks to remain in the west. Since Thanksgiving, except for 2 brief thaws, we have been treated to a continuous fresh, clean and glistening snow blanket (none of that hoping the torch passes to preseve a crusty pack) with nonstop cold. Feels like a Winnipeg winter. But whats been lacking locally is a real big storm (biggest was 6.2"). With the eroding of the deep cold and the getting to that time of year when real dynamic late winter/early spring storms can develop, its the transition from deep winter to gambling time. More risk, more reward type. Might as well buckle up, what have we got to lose?

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On 2/8/2026 at 1:52 PM, Baum said:

The great VD storm of 2026 has yet to show its face. 

There it is: 
 

IN THE EVENT PRECIP DOES EXPAND WELL NORTH INTO THE AREA,   ACCUMULATING SNOW WILL BE IN PLAY LATE SATURDAY INTO EARLY   SUNDAY.    
 

AS A NORTHERLY TREND IN THIS SYSTEM   WOULD INTRODUCE MORE POPS TO THE AREA, WHICH COULD BE IN THE   FORM OF WINTRY WEATHER.

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