STARTER: What is today’s lesson about? Can you guess from these words? Olga Evacuation Heavy rainfall Andrew Eye Wind Floods Katrina

Topic: Natural Disasters What is a Hurricane? Write the new topic title at the top. Then write today’s lesson title underneath. Key spellings: Hurricane Cause Effects LO: To be able to describe the formation of a hurricane. To be able to explain the effects of a hurricane. Starter: In your book answer the following question: What is a hurricane?

What are Hurricanes? A hurricane is a severe tropical storm, A tropical storm becomes a hurricane when winds reach 74 mph Hurricanes have spiralling winds that rotate around an "eye.“ They can be up to 600 miles across Hurricanes are categorised on a scale of 1-5, category 5 being the most deadly! LO: To be able to describe the formation of a hurricane. To be able to explain the effects of a hurricane.

Hurricanes are also known by other names – tell me what they’re known by around the world. Around the world hurricanes have different names. For example in the Indian Ocean they are known as cyclones, in the Pacific Ocean around South East Asia and Japan they are known as typhoons, and in the Atlantic Ocean and the Pacific Ocean around the West coast of the USA they are known as hurricanes. LO: To be able to describe the formation of a hurricane. To be able to explain the effects of a hurricane.

Formation of a hurricane Task: You are going to be given some information about the formation of a hurricane. You are going to draw at least 3 diagrams showing how a hurricane is formed. The word annotation means to add a detailed comment to your diagram LO: To be able to describe the formation of a hurricane. To be able to explain the effects of a hurricane.

Homework – due next lesson Effects means the consequences or impact the hurricane has had Task: You are to produce a large information poster describing and explaining the effects of a hurricane. This poster will form the basis of an extended piece of writing. Categories: Social = people Economic = money Environmental = nature, pollution Short term = the first few days Medium term = the first few months Long-term = years Success criteria: Categorise the effects under headings Write a sentence to summarise the impact of the effects and responses Draw a diagram to support your description Use examples of what happened in Hurricane Katrina LO: To be able to describe the formation of a hurricane. To be able to explain the effects of a hurricane.

This is the most important effect of a hurricane since it determines how powerful the storm is, and how much storm surge and damage it can cause. Winds in a hurricane can reach up to 200 mph Wind is responsible for much of the structural damage caused by hurricanes. High winds uproot trees and tear down power lines. The maximum winds from fast moving and powerful storms may remain high, even when the storm is well inland. Often this is actual wind speed combined with the speed of the storm.

This is a storm surge- a wall of water which hits land causing flooding

Hurricanes generate huge amounts of rainfall, this can cause flooding as the ground cannot soak up all the water

Storm surge and tidal flooding--This is the most devastating and notable effect from a hurricane. Storm surge is the rising wall of water the comes ashore with a land falling hurricane, and is responsible for 90 percent of all hurricane related deaths.

Tornadoes--This is probably the least thought of effect of a hurricane, but they do occur. Tornadoes occur in a hurricane as a result of the tremendous energy and instability created when a hurricane makes landfall. Most tornadoes that occur in hurricanes are only minimal in strength.

Hurricane-force winds, 74 mph or more, can destroy poorly constructed buildings and mobile homes. Debris, such as signs, roofing material, siding, and small items left outside, become flying missiles in hurricanes. Winds often stay above hurricane strength well inland.

Hurricane Katrina effects The overall economic impact of hurricane Katrina was estimated to be about 150 billion dollars, which was the priciest natural disaster in United States history. 1,300 people died. Hundreds of thousands of people had left the city of New Orleans while others headed for safety, as they had been told to expect a direct hit from the storm. In fact Katrina swerved to the east, so New Orleans escaped the very worst of the winds. The city was still hit by 160km/h winds and an enormous amount of rain fell destroying many lighter buildings and causing extensive damage to others. New Orleans is built on low lying land) it is actually below sea level in places). The flood wall (called levees) which protects the city was punctured in at least three places caused extensive flooding. About 80% of the city was thought to be under flood water up to 6m deep. The hurricane had created a huge storm surge (tidal wave) too powerful for New Orleans levees. People gathered in the city’s Superdrome awaiting rescue in terrible conditions; the tens of thousands of survivors were desperate as there was no clean water in the city to drink. There was also no electricity or sewage system, power and telephone links failed and there was widespread looting of shops and homes for food and water.

Review One thing I didn’t know at the start of the lesson but I do now is…………….