You don’t remember systems like these because they used to be classified level 2 and the forecast would call for thunderstorms, some of which could be severe.
It must be a quite new change to the classification system ... I don't even remember this stuff last year, or a few years ago.
I do recall, however, that there was a September 2019 (?) downpour over much of the city that flooded the CBD in New Orleans during the work day. I waded several blocks long Poydras to get to my car and get home. THAT downpour was essentially forecast in advance, and was probably something we'd have heard nothing in a typical 1980s weathercast.