It's because of the timing. It's scheduled to hit during bus drop off. Your options are:
- Keep students and staff in all buildings stay after school until the weather event is clear
- Dismiss at normal time and hope things go well at drop off
- Dismiss early and avoid all chances of weather, clearing the district of any potential wrongdoing stemming from a kid getting dropped off in lightning.
I also never had this happen "back in my day", but I also never had the potential of a tornado causing system hitting right when I was supposed to be getting off the bus.