Watch this big-time #tornado intercept in the Dominator 3! We measured a 120 mph wind inside the suction vortex as the tornado planted. Later that night, a powerful tornado struck Valley View, Texas. Tornado Alley has been so back. We are watching the October 20-23 window for the start of the fall severe weather season! Live Dominator mode will be back soon. | Reed Timmer Extreme Meteorologist

In 2011, the deadliest U.S. tornado in more than 60 years hit Joplin, Missouri. Survivors tell their stories tonight at 10/9c on "Survival Mode" – a new docuseries from NBC News Studios and the producers of Dateline airing Mondays on NBC. | Dateline NBC