I'm a U.S. native speaker. This is an interesting question. I'm not sure of the answer! I do not use it myself. I do not honestly think I've ever heard it used. Yet people say they use it. My wife says she's used it. All I can say is, I don't remember ever hearing her say it. It's much more common to say boring things like this: "It's really raining out there." "It's _really_ raining out there." "Wow, it's a real downpour." "It's just pouring, I'm drenched." "Boy, look at that rain. Look at it coming down." "That's just torrential."

My family uses it

I'll use it.

It is still in use - I hear it on occasion.

It's a little quaint, but is still used occasionally