Gear up for another exciting season of storm chasing!Venture with an intrepid group of scientists, filmmakers and adventurers as they hunt down devastating tornadoes to capture amazing IMAX footage and valuable scientific data in Americas Tornado Alley. Follow this diverse group as they embark on another grueling season of storm chasing.

Follow scientist and engineer Tim Samaras as risks his life in the name of research, traveling through Tornado Alley during the 2008 tornado season -- one of deadliest in history. With more than 30 years of experience in disaster analysis and his expertise in designing tornado technology, Samaras hopes to gather never-before-collected data from inside and outside of the tornado. His goal: to design a new computer model that predicts tornados faster than ever before.

In just three days in April of 2011, over 300 tornadoes battered the United States in one of the most extreme weather events in history - killing hundreds, and destroying nearly everything in their wake.

April 2011 was the most violent month of tornados on record, and the deadliest in modern times. The super outbreak of April 26-27 alone involved more than a hundred separate twisters, killing over 300 people and cutting a swath of destruction across the south. Using dozens of amateur and professional sources, Witness tells the story of this once-in-a-century event, as captured by those who lived through it.