I occasionally work at a park where...
they have the one mounted on a pole. It flashes a bright strobe, a shrill siren wails for about 30 seconds and the light continues to flash until the lightning risk is gone from the area. Then we wait 30 minutes after the light quits flashing. Never seen lightning there. Played in rain there when it did not go off. Stopped play two times in the last five years when I was there. I am sure there were other occasions it went off. The park director and league administrators love it. I guess it is fine if that is a real risk. I have no personal experience with lightning strikes to anyone I have ever known or even heard of. I guess I am just lucky.
Your mileage may vary.
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"We are the stewards of baseball. Our "customers" aren't schools, or coaches, or conferences. Our customer is the game itself." Warren Wilson, quoted by Carl Childress, Officiating.com article, June 3, 2008.
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