As Southern California braces for a storm heading our way, officials are warning residents of the potential for tornadoes. Dr. Ariel Cohen, a lead meteorologist with the National Weather Service, shares what the public can do in case a tornado forms amid the storm. For a timeline on when the system is expected to arrive, click here: http://4.nbcla.com/0idu4FI | NBC LA

Illinois, Indiana, and Ohio have had some of the most tornadoes this year