Found in the "GMBA Rules - General"
25. If any GMBA umpire assigned to a game hears thunder during a game, the Home Plate umpire will immediately end the game. In leagues that do not have an assigned GMBA umpire, the home team coach is required to end the game if he or she hears thunder.
Found on Baseball Ontario's website
Baseball Ontario follows Environment Canada 2016 guidelines with respect to lightning safety:
When thunder roars, GO INDOORS!
If you can hear thunder, you can get hit by lightning. Take shelter immediately. If you cannot find a sturdy, fully enclosed building with wiring and plumbing, get into a metal-roofed vehicle. Stay inside for 30 minutes after the last rumble of thunder.
Direct strikes are responsible for only 5% of lightning-related deaths and injuries. Two other types of hazardous phenomena are caused by lightning. Ground current and side flash account for 60 to 80% of lightning-related injuries and deaths. A ground current is set up when lightning hits the ground, spreads out and sends a current through a victim. Side splash occurs when lightning hits a tall object, travels partly down the object and then jumps to a nearby victim.
Lightning Safety and Preparedness Fact Sheet
Video: Lightning Safety on the Field
OBA Lightning Rule
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