What category was Hurricane Katrina?

Flexi Says:
Katrina was a category 4 with wind speeds of 155 mph and storm surge 20 feet high. It was the most destructive storm to hit the land in 36 years.
Katrina was a category 4 with wind speeds of 155 mph and storm surge 20 feet high. It was the most destructive storm to hit the land in 36 years.