Of the 10 children killed by the tornado, seven were inside Plaza Towers Elementary School.

CNN: Piece of children's book reflects the loss in Oklahoma town

Huddled inside the hospital, Barnhart says she didn't realize how much damage the tornado had caused until she walked outside and saw the bowling alley across the street -- or saw where the bowling alley used to be.

CNN: Doctor's quick thinking saves patients

Williamson said she knows emergency officials recommend taking shelter inside a structure, but fresh in her mind was the devastation of the Moore tornado.

NPR: Frightened Okla. Residents Opt To Flee Tornadoes