I would agree with flyingseale. These are a little dark. However, being in the storm and cloud photography myself, I know how hard it is to expose clouds and the ground so that everything is a least visible. It seems that if you expose for the clouds/sky (which looks like you did) the ground is extra dark, but if you expose for the ground the sky it too bright (blown out). In this series, I would probably experiment with different crops to make the dark areas work for you. Then lighten up the shadows a bit to get a little bit more detail in them. These are some good shots but could use a little work.