May of last year was a dangerous and deadly month for storms around Oklahoma City.
24 people killed in Moore on May 20, 2013 and 8 killed in El Reno on May 31, 2013, some of them highly-trained storm chasers.
A new video aims to keep people safe.
Even if you've lived in Oklahoma all your life, some tornado tips might surprise you, such as: Tornadoes don't always move in straight lines.
In fact the El Reno tornado did anything but move in a straight line.
The El Reno funnel also went from an almost stationary position to moving at 50 miles an hour, with no warning.
And at one point it doubled in width in just five minutes.