Technically hurricane season starts June 1, but it's September when most hurricane activity in the Atlantic Ocean is seen.
Hurricanes are categorized by wind speed, prior to 1991 it was air pressure and wind speed. Cat 1 hurricanes have wind speeds of 75-95, Cat 2: 96-110, Cat 3: 111-130, Cat 4: 131-155, Cat 5: 156 mph and higher. Hurricane Katrina had wind speeds of 175 and higher.
Hurricanes flow in an east to west direction and their winds in a counter-clockwise direction.
Earthquakes are more common than hurricanes. We can only feel 100,000 of the 500,000 of the annual global earthquakes.
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Sources: NOAA, National Geographic