Written by: on October 7, 2016 @ 12:48 pm

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What is a Hurricane?

A hurricane is a huge tropical storm! It can be hundreds of miles across and have strong winds spiraling inward and upward at speeds of 75 to 200 mph. For instance, at peak intensity Hurricane Matthew was a Category 5 hurricane with maximum sustained winds of 160 mph. 

What makes a hurricane special is that it rotates around the “eye” of the storm, which is the calmest part.  Hurricanes rotate in a counter-clockwise direction in the Northern Hemisphere and clockwise direction in the Southern Hemisphere. You need three things for a hurricane to form: warm water, cooler air, and wind.

Typically, hurricanes form over warm ocean waters of at least 80°F. That combined with the cooler atmosphere (the air) of early Fall sets things up for a hurricane. Add into that, wind that’s blowing in the same direction and at the same speed, forcing air upward from the ocean surface. The winds flow outward above the storm allowing the air below to rise. Hurricanes typically form between 5 to 15 degrees latitude north and south of the equator. The Coriolis Force gives hurricanes that special spin you see! Atlantic hurricanes typically occur between June and November. Hurricane Matthew is the first Category 5 Atlantic hurricane since Hurricane Felix in 2007.

How are Hurricanes Classified?

Hurricanes are classified into five categories, based on their wind speeds and potential to cause damage.

Category 1: Winds 75-95 mph with minimal damage

Category 2: Winds 96-110 mph with moderate damage

Category 3: Winds 111-130 mph with extensive damage

Category 4: Winds 131-155 mph with extreme damage

Category 5: Winds 155+ mph with catastrophic damage

Sometimes a hurricane will start with a high classification of Category 5 but then drop once it hits land. For instance, Hurricane Matthew started off as a Category 5 but was considered Category 4 once it made landfall in Florida. Once a hurricane hits land it loses strength i.e. decreases in category because of cool temperatures, a lack of moisture, and/or friction. Moisture is what fuels a hurricane!

What are some Famous Hurricanes?

1992 – Hurricane Andrew – Category 5

1999- Hurricane Floyd – Category 2

2005- Hurricane Katrina – Category 5

2012- Hurricane Sandy – Category 3

2016- Hurricane Matthew – Category 5/4

Check out this cool video! Make a hurricane in a bowl at home with your children!






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Catogories: Hot Topics: Science in the News

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