When it withstands an EF-3 tornado passing by 1000 ft away! Can't believe we had a tornado in New England......and on my 30th birthday to boot. Golf ball sized hail started coming down and I ran to close the flock up in the coop, just as hubby starts yelling to get in the basement. Fortunately it passed just down the street and we had very minimal damage. Power crews are working day and night and we got our electric and internet back last night.