We are entering the active phase of the pattern with Saturday nights Storm beginning at the Lake Tahoe region. Every cycle there are a different lineup of forces (AO, NAO, MJO, ENSO, etc.). Those differences relate to the outcome shown on the 500mb charts. Let’s look at those charts of this years La Niña dominant pattern.
45-46 day pattern
You can see that these charts have a similar look to them. The differences, again, are the strength of the different teleconnections. All of these snapshots have a second round of energy following the first round come with the exception of the October snapshot. The pattern was still developing in October. Tomorrow will get into the next trough that sets up 13 days after this one.