3. Make sure your shelter follows proper guidelines FEMA 320, FEMA 361, and ICC-500; safe rooms built to FEMA guidelines are able to withstand winds of an EF-5 tornado 4.

Since the tornado, 66 homes have registered their storm shelter. More than 500 homes are registered that were in the storm's path. There are more than 1,300 storm shelters registered citywide.

Texas Tech University, a leader in storm shelter certification, tests structures by firing debris from air cannons at 150 miles per hour to simulate tornado conditions.