0 a.m. eastern, so set your alarms and start your day with cnn. that s it for the lead. i ll be back at 6:00 p.m. eastern to fill in for wolf. but now i turn you over to brianna keilar, filling in for wolf in the first half of the situation room. tens of millions could files powerful storms including the terrifies and high-speed winds known as a derecho. 10-year-old sarah is getting a new set of lungs. wolf blitzer is off today. i m brianna keilar, you re in the situation room. a top sblel jens official is the director of the national security agency says the details are still classified, but he tells lawmakers that phone records were critical in foiling numerous terror threats. it s dozens of terrorist events that these have helped prevent. i want the american people to know we re being transparent in here. while u.s. authorities build a case against the man who blew the lid off those survaluance programs, edward snowden has dropped another bombshell, the self-declared