On the topic of flash floods esp. when traveling; I make a conscious effort to not park/stay anywhere liable to flash-flood, and that requires some situational awareness in the sense of at least knowing your surroundings and the area's geography/climate/seasonal weather patterns. We recently narrowly avoided getting caught in [0], and that was with us making a conscious effort to not spend too much time in any of the low-lying areas, not even for a day hike - we'd always park somewhere relatively high and simply avoided hiking any of the low regions. That storm happened just one day after we were there passing through that exact spot. The tourists staying at that popular hotel probably didn't think about how they're staying on the floor of an enormous desert valley in a monsoon-y time of year. By failing to prepare you're preparing to fail...
[0] https://www.latimes.com/california/story/2022-08-05/unpreced...