Most I am familair with are automatic and the siren goes off when lightning detected within X amount of miles away.
Ours are located at various points across the course.
I'd sure like to be the one controlling when it sounded.....

The trickier part is whether you send someone into harms way to pick a group up -who watched the storm approach and simply decided to roll the dice and keep playing-(storms coming are clearly evident from our vantage point 250 feet above the Bay)
We don't