STARTER: What is todays lesson about? Can you guess from these
words? Olga Evacuation Heavy rainfall Andrew Eye Wind Floods
Katrina
Slide 2
What is a Hurricane? LO: To be able to describe the formation
of a hurricane. To be able to explain the effects of a hurricane.
Key spellings: Hurricane Cause Effects Starter: In your book answer
the following question: What is a hurricane? Write the new topic
title at the top. Then write todays lesson title underneath.
Slide 3
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.
Slide 4
Hurricanes are also known by other names tell me what theyre
known by around the world. LO: To be able to describe the formation
of a hurricane. To be able to explain the effects of a hurricane.
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.
Slide 5
Formation of a hurricane
http://video.nationalgeographic.co.uk/video/environment/environment-natural-disasters/hurricanes/katrina-
formation/ 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.
Slide 6
Homework due next lesson 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. Effects means the consequences or impact the hurricane has
had 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.
Categories: Social = people Economic = money Environmental =
nature, pollution Short term = the first few days Medium term = the
first few months Long-term = years
Slide 7
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.
Slide 8
This is a storm surge- a wall of water which hits land causing
flooding
Slide 9
Hurricanes generate huge amounts of rainfall, this can cause
flooding as the ground cannot soak up all the water
Slide 10
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.
Slide 11
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.
Slide 12
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.
Slide 13
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 citys 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.
Slide 14
Review One thing I didnt know at the start of the lesson but I
do now is.
