If I didn't have the lens with me I would have shot and cropped the image I wanted in the darkroom later. In order to bring out the clouds and darken the sky just a bit I used a combination of filters again. The polarizer and the yellow together. I faced three real problems that are able to be solved in the darkroom. The first was the light area on the left.
Skies get lighter as they get closer to where the sun is.
The second is the high clouds lightening the right corner of the image as the storm moves in. The third is the use of the polarizing filter. First, it doesn't polarize all angles of light evenly. Second, it doesn't darken high clouds to match the clear sky. Both are easily solved with minor darkroom burning in of the image if I want to, or, in the case of the high clouds to the left, with a higher contrast filter to lighten them in relation to the sky.