Storm Chasers (Join the hunt for some of the worst twisters in an area of the United States known as Tornado Alley). Perfect Disaster (See what might happen if a mega tornado, killer typhoon, or other catastrophe ravaged major cities).

Little on earth can withstand the violent fury of an F5 tornado. A churning vortex with wind speeds over 300mph, these tornadoes create immense swaths of death and destruction in a matter of seconds. Today, experts are exploring the supertwister's complex inner workings in bold new ways in the hopes of one day being able to accurately predict the occurrences of tornadoes. Top scientists and meteorologists work within miles of these furocious twisters...