We don't have a basement or a tornado shelter, so we just go to the most interior windowless room, which is the little half bath. Since there is a tornado outbreak ongoing in the South, I checked the room to make sure everything is in there: blankets, sturdy boots, water. J added a weather radio, so she is taking this seriously. Might even put some motorcycle helmets in there.
In 2022, when the last terrible tornado hit anywhere near us, it hit in the middle of the night (as they usually do, here) and we were so sleepy, we ignored the Tornado Warning alert on our phones. It hit 18 miles away, as an EF4 tornado. That's the second highest designation a tornado can be. Our friends lost their home and they were so traumatized, they moved to another state. I am terrified of losing warnings via National Weather Service.
What I'm trying to say with all this is that there is no safe place anymore. Floods in Germany, and alternating dry riverbeds and floods in France, the fires in Australia, South Africa, California, Brazil, Canada, Greece, and Spain (which also has had floods), Hell, even the top of a high mountain is not safe during a freaking hurricane.
So, you will need to have more than one plan, as well as a predetermined place to meet in case you get separated.