What started as Tropical Depression Twelve on Aug. 23, 2005, over the Greater Antilles would soon become one of the deadliest hurricanes on record to hit the United States.

Traveling through southeastern Florida, up into the Gulf Coast and eventually disintegrating over the Ohio Valley, nothing could prepare those in Katrina's path for what they are still reeling from to this day, 20 years later .

A look at the path of Hurricane Katrina. CBS News

How Hurricane Katrina formed

A tropical wave moved off the coast of Africa into the Atlantic Ocean on Aug. 11, 2005, on a westward path. As it crossed the Central Atlantic and eventually reached the Leeward Islands, on Aug. 19 it combined with the remnants of what was once Tropical Depression Ten.

The tropical wave dominated the int

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