portableclassrooms.kubuildingtech.org

This article talks about the 'new generation of relocatable classrooms as far as materials, durabiltiy, lifecyle etc. It shows that the design of these buildings are developing and the design possibilites are endless. So dont be limited with your designs. Great website to explore. http://www.buyerzone.com/industrial/modular_buildings/relocatable-classrooms.html

An article from NOAA about what to do in case of a tornado.  http://www.spc.noaa.gov/faq/tornado/school.html