It was a warning. Last time I went through one, everything stopped, just as it did now...then all Heck hit.
Thankfully, it hit about 2 minutes away from where I lived and no one was hurt.
I’m now in that “calm before the storm” moment.
Sometimes your ears pop, like in an ascending or descending plane, or driving up a mountain. If you don’t have a basement, get in the middle of the house, away from exterior walls.