I took all of these photos at my house except for the last one. It was taken in Shingle Springs, CA looking northeast to where the King Fire was burning. The large cloud is called a pyrocumulus as it was forming over the fire. Fall 2014.
If you would like to know more about clouds, I recommend The Cloudspotter's Guide: The Science, History and Culture of Clouds by Gavin Pretor-Pinney. And don't forget to check out the Cloud Appreciation Society website.
I love watching clouds, but take heed, be careful when driving.