At Vicksburg they must negotiate a 120-degree turn on the meandering Mississippi, then straighten up to pass under the railroad bridge and the Interstate 20 bridge.

NPR: Oil Leak: Miss. River At Vicksburg Remains Closed

Nearby on Interstate 40, between 20 to 30 cars were stranded due to flooding rains, said Figurskey.

CNN: Past 12 months warmest ever recorded in United States

From Ladera Ranch, the gunman headed north and pulled off Interstate 5 in Tustin, about 20 miles away, with a flat tire, police said.

NPR: Official: Calif. Gunman Was Loner, 'Gamer'