Lightning/thunder

[PAlbc]

Quick question regarding lightning/thunder (I'm not an umpire)

Is there a specific NFHS rule regarding when to suspend/delay a game due to approaching/nearby storm? For all our sports it's always been that once a contest start it is the official's call. Is lightning needed or is simply hearing thunder enough?

Basically all lightning safety protocols everywhere indicate that just hearing thunder is enough (because hearing it means you are close enough to the lightning that created it), yet we had several officials not observe that yesterday.

I realize the decision could be made without the official if criteria are met, I'm just wondering if the rule is clearly delineated by NFHS.

Thanks.