RoRoCo, I used the shadow/highlight tool to bring out more details in sky, then used the burn tool on the clouds to darken them, then finished off with a very slight touch of dodge on the cloud highlights to increase the cloud contrast a bit. Didn't touch the colour this time for a change. I've been setting white balance 'in the field' lately instead of doing it on the PC, finding it much easier that way.
beautiful capture of this storm... i really like the light in the lower portion... i'll trade you a storm or two for some 113F weather... it's already starting to get unbearably hot here...