Storm hazards

Question 1

What conditions need to be in place for a storm to occur?

Answer 1

sea temp above 27 degrees (provides continuous source of heat)
ocean depth of at least 70m (moisture provides latent heat)
location at least 5 degrees north and 5 degrees south of the equator ( Coriolis force can cause rotating air)
low level convergence of air in the lower atmospheric circulation ( winds have to come together near centre of low pressure zone)
Rapid outflow of air in upper atmospheric circulation (pushes away warm air which has risen)

Question 2

Where do tropical storms occur?

Answer 2

between 5 and 20 degrees north and south of the equator and they move westwards

Question 3

How long do storms last?

Answer 3

7- 14 days

Question 4

How is the magnitude of the tropical storms measured?

Answer 4

On the Saffir Simpson scale a 5 point scale

Question 5

What are the factors affecting impacts of tropical storms?

Answer 5

intensity of the storm
speed of movement
distance from sea
physical geography of coastal area
preparations
warnings

Question 6

What are the major impacts?

Answer 6

winds: exceed 150km / hr
cause structural damage to buildings
Can Bring down electricity lines and fling debris
Heavy rainfall: 200- 300mm
create severe flooding, landslides and mudslides
storm surge: high sea levels

Question 7

What are methods if protection?

Answer 7

have cyclone/ hurricane drills
Land use planning
sea walls and flood barriers
retrofitted buildings