I’ll find the pictures. In 2008, my base got hit with an F3 that grew into an F4 as it crossed. The Ranges all had connexes as storm shelters, they were anchored at each corner and buried on 3 sides but the roofs were exposed. It ripped them right out . Thankfully no one was in them. I always figured if they’d just buried the roofs that they’d been fine, but they said the roofs couldn’t support the weight of the dirt