In Tornado Alley, schools do not close for tornado watches, which can last for hours and occur on many days during tornado season. Watches mean that conditions are favorable and that’s the most they can predict. I’m not being flippant, but closing school for tornado watches would be akin to closing school because it may or may not hail.
Tornado warnings are issued at most 15-20 minutes in advance. There is only enough time to take shelter. There is not time to send children home.
Et tu, Buckeye?