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Tropical Depression
Katrina first formed as a tropical depression in Caribbean waters near the Bahamas -
Tropical Depression became a Hurricane
It officially became a hurricane when it passed over southeastern Miami as a Category 1 storm. The tempest blew through Miami at 80 miles per hour, where it uprooted trees and killed two people. -
Katrina Strengthens
When the hurricane passed through the warm waters of the gulf of Mexico. The National Hurricane Center predicts that Katrina will become a major hurricane by the time it reaches the central Gulf of Mexico. The eye of the storm is now about 740 kilometers southeast of the mouth of the Mississippi River in Louisiana. -
Katrina became a category 3 hurricane
Katrina's strongest winds have reached 185 kilometers an hour making it a Category Three hurricane. -
Katrina became a category 4 storm
Hurricane Katrina's winds have increased to 235 kilometers an hour, making it a Category Four storm. The eye of the storm is about 500 kilometers south of the mouth of the Mississippi River. New Orleans Mayor Ray Nagin issues a mandatory evacuation order. Tens of thousands of New Orleans residents begin streaming out of the city. -
Katrina became a category 5 storm
The night of August 28, Katrina's winds are blowing at about 280 kilometers an hour, making it a Category Five storm. The center of the storm is about 360 kilometers from the mouth of the Mississippi River. -
Hurricane Katrina arrived to the coast of Louisana
Hurricane Katrina made landfall off the coast of Louisiana hit land as a Category 3 storm with winds reaching speeds as high as 120 miles per hour. -
Katrina became a tropical storm
Katrina becomes a tropical storm and has maximum winds of about 55 kilometers an hour, and its center is leaving heavy rainfall on Tennessee.
However, Floodwaters continue to pour into New Orleans from breaks in the city's levees. -
Aftermath
An assessment from the state of Louisiana confirmed that just under half of the 1,200 deaths resulted from chronic disease exacerbated by the storm, and a third of the deaths were from drowning. Hurricane Katrina was the costliest in U.S. history and left widespread economic impacts.