Lightning:
“See it, flee it; if you hear it, clear it.” Lightning can travel up to 10 miles from the storm’s edge, so if it is seen or heard, the fields should be cleared and the game paused to wait for the lightning to pass. If lightning is not seen for a reasonable time (usually 30 minutes), the game can continue. Players should be instructed to stay until the game is cancelled, so all players are accounted for while a game is in storm delay.

Excessive Heat:
Playing in the hot sun without water breaks or cool shade for players to escape the sun’s heat between defensive innings is a recipe for disaster. Children do not dissipate heat as well as adults do. But you can protect your players from the heat by instituting water breaks, shade covers for dugouts, 5-10 minute breaks between innings and misters/sprinklers/cold cloths to help cool players down. And make sure players are drinking plenty of water or sports drinks before they get thirsty.