Tornado seasons are the result of wind and weather patterns.

VOA: special.2010.05.11

that it will be changing weather patterns,

将来会改变气候模式，

全球变暖和发达国家 - SpeakingMax英语口语达人

Pollution,drought and erratic weather patterns caused by climate change have already decimated much of Yemen's farmlands.

VOA: standard.2010.04.01