Watch CNN.com Live for continuing coverage of the devastating storms that struck the Southeast United States.
Today's programming highlights...
Continuing coverage - Severe weather hits Southeast
11:00 am ET - NASA spaceflight briefing - What will human spaceflight consist of in a post-shuttle environment?Â NASA hopes to answer those questions when it unveils the four companies selected for the next round of the Commercial Crew Development initiative.
1:30 pm ET - Race to 2012: Santorum remarks - Former U.S. Senator Rick Santorum, who's considering a run for president next year, speaks at the National Press Club on foreign policy.
3:10 pm ET - Obama makes 'personnel announcement' - President Obama is expected to announce his intention to nominate Leon PanettaÂ to be the next Defense Secretary, as well as Gen. David Petraeus to replace Panetta as CIA Director.
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