I noticed a tweet from the BAMwx twitter account which reminded people that even though a -WPO configuration will provide for short term cooler weather, the long term outlook isn't as pretty.
As a reminder, here are the EPO/WPO combinations at the 500mb level.
Upon seeing the tweet I went ahead and looked up the Bering Sea Rule aspect 19 days earlier below.
Throwing in my SOI (Southern Oscillation Index) research and this is what I came up with 19 days after a 3 day drop of 20 points! Yes...I know it was 17.15, but it also mimics the one day drop of 10 points in our research with AN over the top and BN off the East Coast.
|20pt drop in three days|
|10pt drop in one day|