Hurricane Florence replaced its eyewall. What does that mean?

Late Monday night, Hurricane Florence — the Category 4 storm barreling toward the East Coast of the U.S. — decided to replace its eyewall. And it’s threatening to do so again.

This dramatic-sounding event tends to make major hurricanes even stronger, and larger, explained Chris Slocum, a storm researcher specializing in the inner-core processes of hurricanes at Colorado State University. 

But how does such an atmospheric event unfold for any storm, let alone the ominous Hurricane Florence with extreme winds forecast to blow just off the coast of the Carolinas late Thursday?

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Source: Mashable | Hurricane Florence replaced its eyewall. What does that mean?