In the given question given conditions such as 1. sudden drop in temperature 2. increased wind speed and 3.appearance of grey puffy clouds shows the pre- condition of rain or thunderstorm before two hours.
Because the clouds which are responsible for rain are cumulonimbus clouds grey in color and puffy as well.
You could perhaps expect rain and thunderstorm based on these conditions - a sudden drop in the temperature, an increase in wind speed, and the appearance of puffy, grey clouds.
I think it will mean that the words of the question represent the key-words of your thesis. So you mustn't change the words of the question while writing your thesis
