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Transcript of Hurricanes
Grade 7 GT Science, Period II Description A hurricane is a system of sustained winds of at least 74 miles per hour.
It can be a deadly storm as the winds can blow down houses and trees, and the rainfall can cause flooding. A hurricane tends to develop an 'eye,' where the atmospheric pressure is lowest. The eye is relatively calm and in the center of the hurricane.
Around the eye is an area called the 'eyewall,' where the strongest winds and storms circulate. Credits http://upload.wikimedia.org/wikipedia/commons/e/e4/Hurricane_Floyd_1999-09-14.jpg
Edie's Dad :-) Bibliography Hurricanes are measured by their wind speeds using the Saffir-Simpson hurricane wind scale. There are 5 categories. Formation Location Damage Safety Records History The Saffir-Simpson Hurricane Wind Scale Category 1 Category 2 Category 3 Category 4 Category 5 Winds: 74 - 95 mph
Damage to unanchored mobile homes, vegetation & signs
Coastal road flooding
Some shallow flooding of susceptible homes
Storm surge: 4 - 5 feet Winds: 96 - 110 mph
Significant damage to mobile homes and trees
Significant flooding of roads near the coast & bay
Storm surge: 6 - 8 feet Winds: 111 - 130 mph
Structural damage to small buildings
Large trees down
Mobile homes largely destroyed
Widespread flooding near the coast & bay
Storm surge: 9 - 12 feet Winds: 131 - 155 mph
Most trees blown down
Structural damage to many buildings
Roof failure on small structures
Flooding extends far inland
Major damage to structures near shore
Storm surge: 13 - 18 feet Winds: >155 mph
All trees blown down
Some complete building failures
Widespread roof failures
Flood damage to lower floors less than 15 feet above sea level
Storm surge: >18 feet Hurricanes are large and dangerous storms, and they can cause severe damage and even death. The most common types of damage are: HIGH WINDS can blow down trees, power lines, and buildings. After a hurricane looses its power, it can dump massive amounts of rain on an area, resulting in FLASH FLOODING. The winds can also spawn TORNADOES which can leave more destruction in areas not hit by the hurricane. After the floods have cleared, there can be an explosion of INSECT populations. Protecting Yourself Protecting Your Home STEP 1 STEP 2 STEP 3 STEP 4 STEP 2 STEP 3 STEP 4 STEP 5 Fastest Wind Speed: Camille (1969) - at least 190 mph
Largest Diameter: Sandy (2012) - 945 miles
Most Costly: Katrina (2005) - $108 billion in damages
Highest Death Toll: Great Hurricane of 1780 (1780) - over 25,000 deaths
Highest US Death Toll: Great Galveston Hurricane (1900) - over 8,000 deaths
Most Indirect Deaths: 1970 Bhola Cyclone (1970) - estimated 300,000 - 500,000 deaths Christopher Columbus was probably the first person to document a hurricane, as he experienced the fringes of a hurricane on his many voyages. He learned to decipher the warnings and steered clear of the worst hurricanes during his travels. The first recorded hurricane in North America was made by the pilgrims on their voyage. The records they made are probably the most detailed ancient record of a hurricane. If you can, evacuate.
If you can't, find a safe place in your house away from any windows or glass. Bring some pillows or a mattress. If the storm gets too close, cover yourself with these items. This will keep you protected from flying debris. Make sure you have a survival kit. This needs to include energy bars and lots of water. Also bring a flashlight, because it is likely the storm will knock the power out. This way, if you get trapped, you will have enough food to survive until help comes. Turn off all lights and electricity. Also unplug items such as the TV and air conditioning. You don't want to get electrocuted!!! Make sure that you bring a battery powered radio and a small generator. This way, you can hear how the storm is progressing and when it is over, and have a little bit of electricity for an emergency. STEP 1 Hurricane Season Atlantic Region: June to November
Most occur from August to October.
Eastern Pacific Region: May to November Severe Damage Most of the severe damage in a hurricane is caused by the storm surge, where flooding and thunderstorms can flatten entire towns. The massive amounts of water and wind can also break levees and
cause major flooding,
flattening trees and
reducing houses to piles
of rubble. Cover your windows with boards so that the hurricane doesn't blow them out. Trim back shrubs and trees. In case they blow down, the branches will not do as much damage to your house. Tied down things like boats and other items so that they don't blow away. Bring items such as patio furniture and other non-secure items into the house.This way they won't blow away and cause damage to the house. A hurricane forms when cold wind blows across warm ocean water, causing it to evaporate. This creates a low pressure system, which rises and forms a cloud column. When winds gather at the edge of the column, the clouds start to spin. More water is sucked up by the low pressure, and when these two combine, it forms a hurricane. Length and Movement While a hurricane can last for days at sea, they lose their power once they hit land. They cannot retain their form because they don't have any water to fuel them. Once they make landfall, they peter out and may dump massive amounts of rain on an area. These storms can last for up to 10 days. A hurricane moves with the wind, depending on where it is in the world. The clouds are blown by the wind and can move a hurricane as fast as 70 miles per hour, though most storms move about 15 to 30 mile per hour. Hurricanes form in both the Atlantic and Pacific oceans, and cause damage to cities around the world. In the United States, most hurricanes hit the East Coast and the states in the Gulf of Mexico, including Texas. Chief of Formatting: Edie McRoberts Head of Research: Mia Haraguchi | For More Information: For more information, see Mia's incredibly detailed Prezi at: