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Tropical Depression. The first sign that a hurricane may be in the making is the appearance of an organized cluster of thunderclouds over tropical seas. This region of convective activity is labeled a tropical disturbance if a center of low pressure is detectable at the surface. A Tropical depression has a highest wind speed of 38 miles per hour (33 knots), with some rotary circulation and one or more closed isobars. When viewed from a satellite, tropical depressions appear to have little organization. However, the slightest amount of rotation can usually be perceived when looking at a series of satellite images. Instead of a round appearance similar to hurricanes, tropical depressions look like individual thunderstorms that are grouped together. Chances are that the tropical depression was triggered by the ITCZ, by a trough in the westerlies intruding into the tropics from midlatitudes, or by a wave (or ripple) in the easterly trade winds, called an easterly wave.

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