>> It is difficult to expect any storage facility, other than a cave, to withstand a direct hit from a tornado of F3 or higher without some level of damage.<<

In a past life I was involved in the planning for some buildings that were intended to withstand tornados.  Based on those efforts, I would expect engineered structures constructed of prestressed concrete to survive even the largest tornados.

"... in 1967, a series of deadly tornadoes hit northern Illinois, killing 57 people and destroying 484 homes. Damages at the time were estimated at $50 million. Two prestressed concrete structures, a grocery store and a high school, were in the direct path of two tornadoes that struck almost simultaneously. Repairs to the structural system of the grocery store were less than $200. In the high school, structural damage was also limited."
http://www.concretethinker.com/solutions/Disaster-Resistance.aspx 

Bill Roach, CRM

Opinions expressed are my own and not those of my employer or any other person or entity.

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