A cold blob has a nicely shaped leading edge. The mechanics of this is simply jelly sliding on a plate. The thicker interior has a higher velocity, and piles up at the edge.
A powerful tropical plume is about to hit the Arctic, but this might just be squeezing the ketchup bottle, and squirting the cold at us. You can see another cold blob coming down.
The winds are really mucky, with a huge clockwise gyre off the east coast.
ps. for the Alaska view, you can see the blob, but strong Pacific air is coming over the mountains. Alberta will have lots of snow.
the cold blobs are hitting the Pacific plumes, but they have enough heat energy to keep on truckin'.
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