They had 2 days of warning that friday night was gonna bring a fuck ton of tornadoes because thats how obvious the weather pattern was.
You're playing fast and loose with risk definitions, and arguing that until loss of life was guaranteed the employer had no responsibility to not force employees to risk their life.
The entire region knew this was gonna be a bad storm in advance. Bosses and managers choose deadlines over human safety. They should be held criminally liable for that choice.