Originally Posted by
YVR Cockroach
And obviously, don't go into any canyons for the few hours after rain. Parks will probably have warning signs. Other places less so.
And don't assume because it's not raining right where you are that it isn't an issue. A storm miles a way can sometimes result in flash flooding in an area that didn't get any rainfall at all. Flash floods are scary beasts, and we've seen at least one every time we traveled extensively during monsoon season in the southwest/west.