[header] How to build a storm shelter [title] Decide what type of " storm " and/or " wind rating " you are building a shelter for. [step] Tornado is an " ef " rating of 1-5. Hurricane is similar. 
This will help you decide on how strong your shelter should be built. [title] Find out if the area you intend to install this' tornado or hurricane' shelter is in a " flood zone " or " storm surge zone.