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December 2021


MJO812
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2 hours ago, bluewave said:

The RMM chart forecasts are famous for rushing things. All you are seeing  know is them correcting to the slower VP charts. The VP charts still have MJO phase 7 on January 1st.


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I know the phase 7 for January is a relatively warm outlook That’s if it stays in phase 7 for the extended period time

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1 hour ago, MJO812 said:

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I would be somewhat cautious, though I think January 1-10 will be colder than normal. December 21-25 is now colder on the EPS, too.

The issue I raise is that Rai will likely have some impact on the pattern evolution. One cannot wholly dismiss it regardless of its skewing some of the MJO measures.

 

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8 minutes ago, donsutherland1 said:

I would be somewhat cautious, though I think January 1-10 will be colder than normal. December 21-25 is now colder on the EPS, too.

The issue I raise is that Rai will likely have some impact on the pattern evolution. One cannot wholly dismiss it regardless of its skewing some of the MJO measures.

 

Is the typhoon just skewing the index or is it actually affecting the MJO itself (and, hence, the index is reflecting that)?

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1 hour ago, thunderbolt said:

I know the phase 7 for January is a relatively warm outlook That’s if it stays in phase 7 for the extended period time

We haven’t been following any of the traditional MJO composites this month due to the interference pattern and big +AAM spike. Raleighwx posted some great custom composites with +AAM. But I think that the sample size gets really small when we get several factors interacting with each other. The MJO 7 500 mb composites in January have more ridging near the West Coast. But none of the composites may be an exact match due to the interaction of different influences and the recent very strong -PNA and -PDO couplet.
 

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59 minutes ago, donsutherland1 said:

I would be somewhat cautious, though I think January 1-10 will be colder than normal. December 21-25 is now colder on the EPS, too.

The issue I raise is that Rai will likely have some impact on the pattern evolution. One cannot wholly dismiss it regardless of its skewing some of the MJO measures.

 

I would have to agree that the end of this month into early January is colder, assuming that the MJO wave progresses normally, into 7, 8, 1, which is a big “if” right now. The question then become post 1/10. Some models are showing IO convection flaring up by mid-January. If that’s really the case (another “if) then the pattern will start to mild up as we progress into mid-late January and February in the absence of some major SSWE. There are a lot of questions going forward and given the severely -PDO and -PMM, I would seriously doubt any extended +PNA run being shown on the models. We have been constantly defaulting back to a big -PNA/RNA since the beginning of September 

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