We are getting a classic Alberta clipper. I saw these all the time when I first discovered these maps. A clipper is mixed with cold on the north, and a Pacific plume on the south. It's the main type of cold air incursion for Toronto. The big cold blobs, or air glaciers, are an entirely new thing.
A big clairslide is now hitting Europe.
And it is showing as a big ball in the temp anomaly map.
Just in time for the Christmas covid-cold to hit.
ps. the weather people are on this, but I like doing mechanisms.
Lots of snow at the boundary between the tropical plume and the cold air that it is dragging. The key diagnostic is the diagonal trend.
When will the weatherman forecasting figure it out
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