Emergency crews estimate that 80 percent of New Orleans is underwater after levee breaches flooded the city. Search and rescue teams remain focused on lifesaving efforts and medical attention for survivors. Following a recap of a press conference, an emergency…

Hurricane Katrina smashed into the Gulf Coast Monday, bringing damaging winds and torrential rain. An emergency official in Mississippi and a reporter in New Orleans discuss the damage in two of the hardest hit areas.

Scientists from the Center for Severe Weather Research track storms in western Kansas' "Tornado Alley" in an effort to improve their understanding of the process of tornado formation so that better predictions may someday be made.