Sued yes, but the “Act of God” defense, and the Tort claims act, amongst others, would be in play.
Prudence is reasonable, but there is also a fair point to say we’ve never had early dismissals for thunderstorms.
I think your point of remote learning comes into play here; we experienced that this last winter with our school district being a bit too eager to go remote.
The times, they are a changin….
In any event, we just had a heavy rain shower, with one rumble of thunder, come through. Mostly cloudy now.