Final answer:
The denser, organized portion of a hurricane, excluding its outer spiral bands, is referred to as the storm's eye. This is the storm's center of rotation, where the winds are ordinarily weaker.
Step-by-step explanation:
The organized, denser portion of Hurricane Katrina, not including the wispy outer spiral bands, is known as the eye of the storm. This is the center of rotation where winds are typically weaker due to the tangential velocity being directly proportional to the radius of curvature. For instance, when Hurricane Katrina devastated the coastal stretches of Alabama, Mississippi, and Louisiana on August 29, 2005, the eye of the storm was where the hurricane's rotation was centralized and the winds were relatively weaker compared to the surrounding areas.
Learn more about Hurricane Katrina