The Katrina Diary - Amy Rohde
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Saffir-Simpson Scale

What's the difference? Tropical depressions, tropical storms, and hurricanes explained.

So what exactly is the difference between a hurricane, a tropical depression and a tropical storm?   It's confusing,and the same storm system in different areas of the world can be called different things.

Let's start with the basics.

Atropical depressionis a low pressure system of clouds and thunderstorms.  It does not have the eye or spiral shape of stronger storms. Tropical depressions are loosely organized, and feature maximum sustained winds of less than 38 miles per hour (61 km/h).
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