On a typical weekend day, the Rio San Gabriel riverbed is teeming with people—bikers, skateboarders, motorcyclists, even horseback riders.
But we had a bit of rain last night, with more expected in the next couple of days. And the strongly worded warning sign at the entrance (OK, covered with graffiti but still legible) made me stop and think—just how likely, really, is a flash flood? After all, the sky is blue, with hardly a cloud in sight.
Flash flooding occurs when it rains rapidly on saturated soil or dry soil that has poor absorption ability. Many people tend to underestimate the dangers of flash floods. What makes flash floods most dangerous is their sudden nature and fast-moving water. And the source of the water might be a storm that occurs miles away. [Wikipedia]
So for today, anyway, unlike those two bicyclists in the picture, I stayed away from the floor of the riverbed.
Just in case.