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A baroclinic leaf is coming our way with a deluge of soaking rain, according to the National Weather Service in Seattle.

What is a baroclinic leaf, you say?

The baroclinic leaf headed toward us was formed south of the Aleutian Islands, he said.

“You don’t want to see a baroclinic leaf develop right off your coast because it has the potential to be a strong storm that could produce widespread damaging winds.”

On Earth, similar structures, known as baroclinic waves, can appear in the atmosphere when cyclones are forming.