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October 2021


Stormlover74
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26 minutes ago, lee59 said:

56 degrees this morning, cooler than I thought it would get but mild for this time of year. Last decent rain was almost 2 weeks ago. So the trend continues here of big rain totals in a 24 hour period and then very little for weeks.

the good thing about sunshine right now is that a warm day is welcome right now

 

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3 hours ago, snowman19 said:

Probably related to the big -PDO/-PMM changes

Yeah, the PDO and PMM are driven by NP pressure patterns like the EPO. A strong +EPO vortex cools the SSTs and  PDO. The -EPO ridge warms the SSTs and warms the PDO. We saw  more of a -PDO drop developing over the summer with the deep low and record clouds near Alaska. But these pressure patterns can change very rapidly from month to month. So it’s tough to know how long any given pattern will last.  We saw the rapid rise into last winter with the uncoupled La Niña and record blocking that took over after November.

 

1784BFB2-8773-4AEC-8567-49330FECBC0A.png.04ac98b89cc69bab04669e52ab58ba45.png


 

 

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5 hours ago, bluewave said:

Yeah, the PDO and PMM are driven by NP pressure patterns like the EPO. A strong +EPO vortex cools the SSTs and  PDO. The -EPO ridge warms the SSTs and warms the PDO. We saw  more of a -PDO drop developing over the summer with the deep low and record clouds near Alaska. But these pressure patterns can change very rapidly from month to month. So it’s tough to know how long any given pattern will last.  We saw the rapid rise into last winter with the uncoupled La Niña and record blocking that took over after November.

 

1784BFB2-8773-4AEC-8567-49330FECBC0A.png.04ac98b89cc69bab04669e52ab58ba45.png


 

 

It’s been awhile since we’ve seen the -PMM/-PDO pattern, it broke in early 2013 and hasn’t been back since now 

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