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This warming creates stronger “wave trains” of atmospheric energy that propagate along the jet stream toward North America.

Tuesday evening’s wave train was big enough to be seen from weather satellites in space!

It’s not clear why the jet stream wavered and set off this so-called wave train of weather systems, Francis says.

Health officials fear another major wave of infections in the fall, and a possible wave train beyond.

What we are waiting for on distant coasts is the energy that escapes from the storm, radiating outward into calmer waters in the form of wave trains—groups of waves, increasingly organized, that travel together.