Pool Indoors - Lightning Outdoors

I'd planned a massive Saturday morning swim today at the Y, but I'm here on the couch blogging because there's a thunderstorm in progress. A few years ago the Y started closing the pool (indoors) during lightning. After all these years. All of a sudden. How many of you practice at facilities where the pool closes down in lightning storms? Is there a good reason for this? Have we all been risking our lives for the last 50 years? Just wondering!