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7th Grade Hurricanes
Transcript of 7th Grade Hurricanes
What is a hurricane?
What are the
conditions for hurricane formation?
Prentice Hall: Earth Science textbook definition
A tropical cyclonic storm having winds in excess of 119 kilometers per hour*.
What is a tropical cyclone?
rotating low-pressure weather system that has organized thunderstorms but no fronts.
a 24 hour disturbance of clouds, showers, and thunderstorms; can become powerful by accumulating wind speed
maximum surface winds of less than 39 mph
maximum surface winds of 39 mph or higher
Once a tropical storm has reached winds of 74 mph or higher, it is identified as a hurricane.
Ocean water temperatures
be 80° or warmer.
Atmospheric moisture from sea water evaporation
combine with heat and energy to form the strong force necessary to propel a hurricane.
blow in same direction and speed for upward movement from the ocean.
What happens when a hurricane forms?
Types of Clouds Associated with
How is the severity of a hurricane measured?
The severity of a hurricane is measured by a Saffir-Simpson hurricane wind scale.
Warm, moist air moves over the ocean.
Water vapor rises into the atmosphere.
As the water vapor rises, it cools and condenses into liquid droplets.
Condensation releases heat into the atmosphere, making the air lighter.
The warmed air continues to rise with moist air from the ocean taking its place and creating more wind.
Different categories of hurricanes
What Causes hurricanes?
Other assisting winds
*119 kilometers per hour » 74 miles per hour
what is a storm surge?
National Hurricane Center
A storm surge is an abnormal rise of water generated by a storm.
Prentice Hall: Earth Science Textbook
The abnormal rise of the sea along a shore as a result of strong winds.
of a hurricane
What are effects of Hurricanes?
North Carolina does see many hurricanes so be prepared!!
The effects of hurricanes would include the destruction that the hurricane leaves behind.
Depending on the level of the hurricane, the destruction could be severe or it could just knock a few trees down.
Hurricanes can also cause the death of many people.
The word hurricane comes from the Taino Native American word, hurucane, meaning evil spirit of the wind.
During every second of a hurricane, the force is like ten atomic bombs.
A hurricane can result in a tornado afterwards.
In the early 1900s, C. Wragge gave the first names to hurricanes.
Hurricane season is from June to November.
The seawater that comes inland is what kills most people during a hurricane.
Climate Affect on Hurricanes
(Another example of the effects of hurricanes.