current wind conditions type of clouds in the sky percent humidity in the air amount of rainfall
I gave my students this multiple choice question: What information best helps a meteorologist predict the possibility of tornadoes developing in a certain area?

Only one answer is correct among these 4 choices:
- current wind conditions
- type of clouds in the sky
- percent humidity in the air
- amount of rainfall

Could you tell me which one is correct?

type of clouds in the sky