HURRICANE STRUCTURE
Hurricane winds blow in a counterclockwise spiral around the calm, roughly circular center called the eye. In the eye, which is roughly 20 to 30 miles wide, it is relatively calm and there is little or no rain. The eye is the warmest part of the storm.
Surrounding the eye is the eyewall, a wall of thunderclouds. The eyewall has the most rain and the strongest winds of the storm, gusting up to 225 mph (360 km/h) in severe storms. The smaller the eye, the stronger the winds. The winds spiral in a counterclockwise direction into the storm's low-pressure center.
Long bands of rain clouds appear to spiral inward to the eyewall -- these are called spiral rainbands. Hurricanes can be hundreds of miles across.
THE EYE,EYE WALL AND RAIN BANDS OF HURRICANE
MIXTURE OF COOL AND WARM AIR
In addition to rotating with wind speeds of at least 74 mph, a hurricane travels relatively slowly across the ocean or land, usually at about 20 to 25 mph.
If you are facing in the direction that the hurricane is traveling, the right side generally has the fastest winds, and the left side usually has the most rain.
HURRICANE ARE FULLY DEVELOPED
FOR MORE SPECIFIC EXPLANATION REGARDING THE STRUCTURE OF KATRINA, VISIT,http://scifiles.larc.nasa.gov/kids/Problem_Board/problems/weather/hurricanebasics.swf
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