The formation of a hurricane can be rather complicated.
However, a hurricane is basically just a big low pressure area with numerous showers and thunderstorms surrounding a center of circulation.
Hurricanes form over warm ocean waters and are most common from the summer to fall time period. When a large group of thunderstorms come together over the ocean they typically are associated with an area of low pressure. So you might hear us talk about a “disturbance” we are watching that could eventually develop into a tropical storm. Air will move toward these areas of lower pressure resulting in an influx of moisture and increasing thunderstorm activity.
In some cases this process will continue to the point that a low pressure area develops into a "tropical depression", with sustained winds between 20 and 33 knots. As
more air rushes toward the tropical depression, more thunderstorms will form, which will lower the pressure even more. As the pressure continues to lower the winds
continue to get stronger. If a tropical depression continues to strengthen, it will become a "tropical storm" when winds are between 34 and 63 knots. A tropical storm is declared a "hurricane" when winds equal or exceed 64 knots (74 mph).
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