Michael Ritter / AP A tornado touches down in Riverside on Thursday, during a wild weather system that lashed Southern California with fierce thunderstorms that unleashed mudslides in wildfire-scarred canyons and dusted mountains and communities with snow and hail. May 22, 2008. A wild weather system lashed Southern California on Thursday with fierce thunderstorms that unleashed mudslides in wildfire-scarred canyons, spawned at least one tornado and dusted mountains and even low-lying communities with snow and hail.