1. The word sinister helps to impact on the reader’s imagery of dark clouds filling up the sky 2. It conveys that the thunderstorm is large and all of it comes to you at once. 3. The children react excitedly as they scream and the adults react in a more serious manner. 4. The imagery is effective as it helps to convey the idea of thunder and lightning occurring. 5. They are described as pregnant because the clouds are dark and filled with rainwater ready to burst. 6. The word stately helps to show how slow moving and large the clouds are. 7. The significance is that the simile is used to help the reader imagine how strong and violent the winds are.