March 25 marks 75 years since the nation’s first ever tornado forecast was issued, putting Oklahoma at the epicenter of the weather world changing forever.

A December 1975 tornado that "just dropped out of the sky" cut a half-mile swath through east Tulsa, disproving the belief that such storms always occur in the spring.

An unusual pair of tornadoes that struck an Oklahoma Air Force base in March 1948 paved the way for severe weather forecasting as we know it today.