A hurricane's central eye can be cloud-free in very strong storms or cloudy in weaker, less organized storms. In both cases, this is an area where winds and rains are light and conditions are mild. Hurricane eyes range in size from 20 to 50 kilometers in diameter. But surrounding the eye is the eyewall, which is usually the most intense part of a hurricane. Eyewall storms contain high winds and heavy rain.
As shown in the following images, warm, moist air flows into the eyewall from the ocean's surface and rises, spiraling counterclockwise upward to the top of the hurricane.
description
Some of this air then sinks downward in the eye, from the upper levels of the hurricane down to the surface. The sinking motion warms and dries the air, creating the mild conditions at the surface within the eye.