Myth: Nothing above ground can withstand an EF-4 or EF-5 tornado
The National Storm Shelter Association/ICC 500 standard and FEMA guidelines provide details on how to fabricate shelters or construct safe rooms that provide near absolute life protection, even in an EF-4 or EF-5.
Over the course of seven days many tornadoes touched down including two EF-4
tornadoes and one EF-5 tornado.
Spokeswoman Keli Pirtle said Tuesday the agency upgraded the tornado from an EF-4
on the enhanced Fujita scale to an EF-5 based on what a damage assessment team saw on the ground.