F3 - SEM1 - Why is Hong Kong often hit by tropical cyclones in summer? - 2.3 Flashcards
What is tropical cyclone?
2.3 Why is Hong Kong often hit by tropical cyclones in summer?
a low pressure system developed over tropical oceans
What is tropical cyclone?
2.3 Why is Hong Kong often hit by tropical cyclones in summer?
4 steps in tropical cyclone formation
2.3 Why is Hong Kong often hit by tropical cyclones in summer?
- air above the oceans is heated and rises when the ocean surface temperature is over 26C
- as air rises, air pressure drops. the surrounding air moves in and results in strong convection => a low pressure centre is formed
- **warm and moist air flows into the low pressure centre and rises. water vapour cools and condenses **=> provide more energy for low pressure system => strengthen low pressure system
- wind speed increases => a tropical cyclone is formed
4 steps in tropical cyclone formation
Where are the tropical cyclones that affect Hong Kong formed? Where do they usually move?
2.3 Why is Hong Kong often hit by tropical cyclones in summer?
- formed above Western Pacific Ocean
- move northwest toward South China
Where are tropical cyclones that Hong Kong are formed
2.3 Why is Hong Kong often hit by tropical cyclones in summer?
What are the main structures of mature tropical cyclone?
2.3 Why is Hong Kong often hit by tropical cyclones in summer?
- a clear eye
- wide rain bands
What are the main structures of mature tropical cyclone
2.3 Why is Hong Kong often hit by tropical cyclones in summer?
Draw a diagram of cross section of tropical cyclone
2.3 Why is Hong Kong often hit by tropical cyclones in summer?
2.3 Why is Hong Kong often hit by tropical cyclones in summer?
What are the 6 types of tropical cyclones classified by the Hong Kong Observatory and their wind speed
2.3 Why is Hong Kong often hit by tropical cyclones in summer?
Tropical depression - 62 km/h or below
Tropical storm - 63 to 87 km/h
Severe Tropical storm - 88 to 117 km/h
Typhoon - 118 to 149 km/h
Severe Typhoon - 150 to 184 km/h
Super Typhoon - 185km/h or above
2.3 Why is Hong Kong often hit by tropical cyclones in summer?
