I agree with Cleve Reeves but for another reason.
As evidenced by the large number of tornados in Tennessee this past year, harsh weather and dangerous conditions are a known hazard and danger by both an owner and the design professional. A standard of care for both school owners and design professionals is that they need to address known conditions and problems in their work, operation, and ownership. Consequently, if a waiver is sought and obtained, regardless of the justification, if there are injuries or deaths as a result of a tornado that could have been reasonably prevented by including a shelter, there's going to be a large negligence filing and award in the works.
Personally, as well, I wouldn't want to have on my conscience that my actions led to or allowed the injury or death of children when I could have prevented it.
This kind of protection should be a high priority for owners and designers, and most good architects can find creative ways to provide the required protection at a reasonable cost.
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Arlen Solochek, FAIA
Owner/Principal/Founder
Arlen Solochek FAIA, Consulting Architect
Phoenix, AZ
ArlenSolochek@gmail.com------------------------------