Insanely Loud Thunderstorm

So earlier today some time in my 10-11:50 class I heard the loudest thunder clap I've ever heard in my entire life, and an even louder one two minutes later, and an even louder and longer one three minutes after that. Seriously, wtf is with this insanely loud thunder? They keep getting louder and louder. And then I heard it start pouring. Must have been some storm, I could hear the wind and everything. And the thunder claps just kept getting louder and longer, booming thunder claps that echoed.