CNN CNN Newsroom With Pamela Brown August 30, 2021 00:10:00
Tom. how uncommon is that, and how does it happen? >> this is extremely rare, and there's a lot of dynamics to it. but i mean it's so rare, maybe it happened a little bit with katrina when it moved in. but if we go back and look at the wind field at landfall, you have to have the exact approach and angle of these strong winds and waves, and the force of the water to push up into the mouth of mississippi. plaquemines parish. this reverse flow, we call it, on the mississippi river lasted for four hours today. it's extremely rare. you go back to where we are now, and those winds are still impedin...