Yesterday was a precursor for the stormy weather that came last night and today. I watched this sky literally churning before me yesterday late morning – it was very dramatic, if not a little unsettling. Processed using a red filter and blue toning, once again to bring out the texture of the clouds.
lisakimmorley.com 
Nice use of filters on this one.
Thanks very much
Great dramatic sky!
Wow, that a real witches cauldron… great effect with the filters.
Amazing texture!
Thank you!