Add a High to a Low and it cancels each out, right?
Try amplify (i.e., wind) instead, plus getting things (i.e., arctic air) really mixed up.
As illustrated in the diagram above, a clockwise-spinning High and counter-clockwise spinning Low can set the stage for pumping polar air quickly and deeply into the south.
It’s been an unusually cold December for Florida.
This last one sort of ices the cake. (article)