Hurricane Milton: Why was this meteorologist reduced to tears describing storm?

Hurricane Milton reduced a US meteorologist with 33 years' experience reporting on hurricanes to tears live on air.

What prompted the moment, said NBC's John Morales afterwards, was atmospheric pressure.

"It's funny how millibars can get a nerd to lose it," he said.

Experts warn the storm could become one of Florida's "most destructive hurricanes" with nearly six million people said to be in the potential path of the extreme conditions.