Storms and tornadoes kill scores in southern US
28 April 2011 Last updated at 11:04 BST
Tornadoes and storms in the south-eastern United States have killed almost 300 people, officials say.
At least 194 people died in Alabama, where Mr Obama will visit on Friday.
Deaths and widespread devastation are also reported in Tennessee, Mississippi, Georgia and Virginia.
First clip courtesy, Chris England - Crimson Tide Productions