NASA to reveal Mars findings

First hand accounts of the moments the tornado struck paint a terrifying picture - an aftermath far worse than many could have imagined. Norah O'Donnell reports.

Moore, Okla., police chief Jerry Stillings speaks to Norah O'Donnell about the devastated Plaza Towers Elementary School, how residents are coping in the aftermath, and how yesterday's tornado compares to the historic 1999 tornado.

Time magazine senior editor Bryan Walsh speaks to the "CBS This Morning" co-hosts about the deadly tornado that hit Moore, and why it's being called worse than the record-setting tornado of 1999.

Moore resident Trenda Purcell speaks to the "CBS This Morning" co-hosts about being reunited with her son Kamden, who was at the Briarwood Elementary School when the tornado struck.

KTVT chief meteorologist Larry Mowry updates the "CBS This Morning" co-hosts on yesterday's storm - how powerful it was and where its headed today.

Mark Strassmann reports on the massive debris field left in the wake of the Moore, Okla. tornado, and the overwhelming cleanup facing residents.