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Easterly winds are clearly evident at the surface, ranging up to nearly 10 m/s about the 900 mb level. The westerly winds aloft are less visible, due to the dominant westerly flow of the jet stream north of the 30th parallel. Even so, a slight extension of weak westerly winds may be observed to extend down nearly to the equator, which is suggestive of the westerly contribution of the top part of the Hadley cell.
Tank
It is possible to visualize the movement of the Hadley cell in a rotating tank of water to verify the expected "winding" and "unwinding" of the Hadley cell. A temperature gradient may be created in a slowly rotating tank of water (< 1 rpm) by placing a container of ice in the middle of a rotating tank of water. Water will then cool next to the tank, sinking and slowly flowing outwards. Continuity will then ensure that warm water on the outside of the tank will flow inward to replace the cool, sinking water. As it moves inward, the warmer surface water should move in the direction of the rotation of the tank of water.