Never heard of a derecho till a few years back. And I am 77 years old. We just called them a rain and wind storm.
I am reminded when the local weather news went bonkers over the term “El Nino” back in the 1980s. You would have thought the end of the world was nigh.
I heard of derecho in meteorology class 58 years ago and hadn’t heard of it since till now:)
We’re the same age.