Lake Effect Transition

The lake-effect event continues to rage.  This morning, the event has slowly transitioned into a more banded structure, as is now apparent in the radar image below.

We don't really understand these structural transitions, but I think in this case it might be related to a gradual veering of the large scale flow at ~700 mb (roughtly crest level) from westerly to northwesterly.     This means the large-scale flow is transitioning from primarily across the surface convergence zone (see previous posts) to along it.

I really should be skiing.