Thomas was also active on Twitter, writing: "To all that just received the warning along with me this morning... apparently it was a 'mistake' hell of a mistake!! Haha glad to know we'll all be safe."
Australia's March Leishman – a three-time PGA Tour winner – said: "It's an interesting feeling, isn't it? Something could happen in the next hour. It's a pretty big mistake.
"It sent some different thoughts through your head. A few extra hugs for the kids. It wasn't panic. It's not like you can see it coming and dodge it."
Charles Howell III added: "All the alarms went off at the same time. It got everyone's attention. I didn't know what to do. We all stared at each other. It kind of shows you the world we live in now. Your whole life can change in a second."