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YMCA of the USA and the National Lightning and Safety Institute recommend that both outdoor and indoor pools be cleared during a lightning and thunderstorm. We follow the 30-minute rule at all of YMCA of Greater San Antonio pools.
Lightning that is within a 10-mile radius
Resume activities 30 minutes after the last observed lightning or thunder
Lightning strike occurs within a 3-mile radius
Resume activities 30 minutes after the last observed lightning within a 3-mile radius of the location
Why do we close our indoor pools during a storm?
Water is an excellent conductor of electricity. Just because a pool is surrounded by a structure does not make it safe during a storm.
That's why we follow the National Weather Service motto: When Thunder Roars, Go Indoors.