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The March 25-March 32 HECS potential


Ji

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AO can be big negative and still have a far west storm track. AO domain space is way north. It shares some with the NAO but just because the ao is big neg doesn't really = a suppressed storm track. That's more the NAO's job.

Even a big -ao doesn't guaranty cold. Remember Dec? Craptastic pac and -pna rendered the -ao useless.

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AO can be big negative and still have a far west storm track. AO domain space is way north. It shares some with the NAO but just because the ao is big neg doesn't really = a suppressed storm track. That's more the NAO's job.

Even a big -ao doesn't guaranty cold. Remember Dec? Craptastic pac and -pna rendered the -ao useless.

Someone can check me on this if I'm wrong, but I think it's more correct to say that a big -AO is a "necessary" condition for well-below normal conditions, but it is not a "sufficient" condition.  To get the really big cold in our area, we want a +PNA/-EPO/-AO = Siberian express.  NAO is not as important, and can even be very positive when we get extreme cold (ala December 89).  

 

A -AO/-NAO combination alone is probably good for below normal conditions, but nothing extreme.  We really need the Pac to line up right to get the uber-chill. 

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