We're under a flash flood warning tonight in Modesto, specifically areas near Dry Creek. We took this seriously because, in fact, we live in an area near Dry Creek. However, we're not on the low ground. If our neighborhood flooded, the whole city would be flooded.
Nevertheless, we might take a little drive over there later and see if the river has overflowed into the park (there is a large park located along the floodplain). It's a very big floodplain, so we think we don't need to evacuate...knock on wood. One neighborhood in town, a few miles away, is practically next to the creek, though, so according to the news, some of those residents are sandbagging.