"Tornadoes can not cross rivers."
I've heard this used where I live to claim that this area is safe from tornadoes due to the crossing of certain rivers that supposedly protect this area from tornado damage. No, no, no, a thousand times no. I have a colleague who says this at times, but I'm pretty sure he's just trolling me to see my reaction. :-) However, there are others who take this myth as truth and don't take proper precautions during tornado warnings.
There is absolutely nothing stopping a tornado from crossing a body of water such as a river or lake. In fact, tornadoes can FORM over rivers and lakes!!! I don't know where this myth came from but it is wrong, wrong, wrong! If there's anything you ever take away from reading my blog, please walk away with the understanding that a river does NOT stop a tornado. Two rivers do not stop a tornado. Three rivers do not stop a tornado. See the pattern?