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The intensity rating of a hurricane is determined based on the maximum sustained wind speed of the storm. For example, Sustained winds of 120 mph will earn a storm a category 3 rating.

Intensity can also be assessed based on the barometric pressure at the center of the storm. Lower pressure means a stronger storm. Rankings of intensity are based on pressure, as it is given as an exact figure, while wind speed is rounded to the nearest 5 mph.

The size of a storm is based on the diameter of the area over which the hurricane produces sustained gale-force winds; winds of at least 35 mph.

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