I'm thankful I didn't have a tornado, but my greenhouse was pushed back about 35cm by the wind. the whole thing just moved like a lightweight. It's 10'x8' and 8' high with 94 panes of glass and a steel base, so it's pretty heavy. 2 panes blew out but didn't break. I was really lucky the damage was minimal, but now I'm trying to find a way to move it back without taking all the glass out. Any ideas welcome.