Fewer than percent of tropical disturbances evolve into tropical ...

[folubunmi]

Fewer than  percent of tropical disturbances evolve into tropical
  cyclones. Based on what youve learned about tropical cyclones, why do
  you think this percentage is so low? What will be an ideal response?

Question 2

If a tropical storm is downgraded to a tropical depression, what does this
  mean about the wind speeds? What will be an ideal response?

[yeungji]

Answer to Question 1

Many conditions must come together in the same place and at the same time to produce
a tropical cyclone. Disrupting one or more of these conditions can halt the storms
development. Some of these interruptions include high vertical wind shear, insuffi cient
depth of warm water, and steering over land or away from warm water.

Answer to Question 2

Downgrading would indicate that the wind speed had dropped below 63 km/hr (39
mph).

[folubunmi]

Excellent

[EAN94]

Wow, this really help