Something different is happening in the oceans of the Northern Hemisphere. The La Nina that is active seems fairly normal, but what is happening around the entire NH is rather odd. Here is the current SST for the world’s oceans.
What is unusual is the cooler than average water developing in the Atlantic ocean up towards Scandinavia. In other La Nina years that has not happened. For instance the following two pictures show the same date in 2007 and 1998. Both were periods were La Nina.
It is early to speculate, but it is possible that the oceans are changing oscillation states. This is not an ocean pattern that has developed in the recent past. That is a strong indication that the unusual winter will persist and that additional unusual weather may develop.
The scientific understanding of the ocean oscillations is limited, but this could be a very interesting shift. One that appears to be causing drastically cooler temperatures. This shows up in the latest channel 4 data from the AMSU near surface temperature. The rate and size of the temperature drop for this channel is unprecedented. The next few months will be very interesting. They could also be very cold. December will have a positive global anomaly, but it is likely that January and February will not.