Whether filtered and color adjusted in Photoshop or not, this is an excellent picture. I can feel the power of the storm brewing in the windswept trees from this angle. The contrast between the brooding, darker clouds and the lighter ones below is striking. Darkening most of the ground elements also highlights the stripe of lighter clouds streaking across the sky. Hmm, a silver lining perhaps? Very interesting. I also like how you avoided the obvious feature of including lightning in the pic. Sometimes a black cloud of rolling thunder is even more ominous without it. You should be proud of this one.