Dream About Evil Laughter In The Desert Valley

I walked out of a house onto a wooden porch, looking down over a wide arid desert valley. The wind was blowing hard and the sky started to darken, and in the gathering clouds lightning flashes. Mixed with the sounds of the thunder I suddenly hear a loud, high-pitched laugh booming from the clouds. The laughter almost sounded like it was right by my ear, and I could only describe it as evil. I woke up breathing hard and terrified.