The comment in the article, "and rarely, if ever, occur West of the Rocky Mountains," is incorrect. Well, specifically the, "if ever" part is incorrect. While they may be rare, tornados occur in California every year. I live in Northern California, and every year there are reports and videos of tornados in the counties just north of Sacramento. There have already been some this year. And I remember that when I lived in the Bay area in the late 80's, (Mountain View, Ca.) a guy I worked with watched a small tornado tear off part of the roof of his neighbor's house. I currently live in Redding, Ca., and in the early 90's I watched a funnel cloud drop down out of some very violent looking clouds during a storm that knocked down nearly a dozen oak trees in my neighborhood. That funnel cloud never touched the ground, but it definitely on it's way to becoming a full-on tornado. The trees were knocked down by high winds during the night, but it wasn't determinded that they were from tornados.