grass field with mountain range in background under cloudy sky

I had been in Grand Teton National Park for 3 days, it had been cloudy and rainy for 2. I got up at 5 am on the 3rd day, grumpy, a bit disappointed, so I slowly drank 2 cups of coffee while I decided what to do. I decided to re-shoot a picture I had taken yesterday; while I was setting up my tripod I turned around and saw this glorious sunrise just starting. I turned the camera around and shot the sunrise instead. In the space of 10-15 minutes, the sky exploded in color, then faded to grey. It sure changed my mood !