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

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, .

(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 interaction and began to form a large area of organized thun

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