When you write your story, writing what the weather was like can add a lot to your story. What you did and how you did it is definately affected by the weather. Maybe you traveled to see something special and because of the weather, you weren't able to see it. Maybe like friends of ours who made a trip back east during the summertime and ended up outrunning tornados, you have a lot of excitement added to your story. The weather really does affect our lives. Include information about the weather when it adds to your life story. It will make it more interesting and more real.
