There are aspects of the failure modes of fan discs vs. flywheels. Most fan discs fail due to a huge imbalance due to the loss of a blade. I have done many tests like this and will attest that a fan letting go is not a fun thing.
And Saturday evening, a large and extremely dangerous tornado was reported near Glenn Heights, TX, south of Dallas, according to the National Weather Service. According to the Dallas Office of Emergency Management, there was some damage in the Glenn Heights area, but no reports of damage in the city of Dallas.
Tornado watch. An example of a tornado watch for parts of Kansas and Nebraska, issued by the Storm Prediction Center on May 5, 2007. A tornado watch (SAME code: TOA) is issued when weather conditions are favorable for the development of severe thunderstorms called a Supercell that are capable of producing tornadoes. A tornado watch therefore implies that it is also a severe thunderstorm watch.