I think it should be noted 2 things. 1, ssw generally gives the blocking and cold to 2 of the 3 continents, so someone is left out. Also, a ssw doesn't guarantee blocking and cold anywhere. It has to co couple with the troposphere for the effects to materialize. Think back to jan 2019, big ssw early in the month but it did nothing because it never worked down to the troposphere. That was the year the weeklies kept showing this epic cold pattern week 3 onward, while it would of been correct if the ssw worked down to the troposphere, it never did that and well we know what happened.