The first two pictures are from my tablet, as I was making my way to the supermarket near my house. It wasn't as dark as it appears in the photos -- that's just due to the light and lack of flash. There was such a straight edge to the line of clouds, a sharp divide between clear sky and cloudy sky.
The next two were taken after I left the supermarket, but before I ventured into the parking lot away from the shopping center. These are from my phone's camera, as I needed to take pics one-handed while carrying plastic grocery bags in the other. I don't think these pictures really picked up the colors in the clouds at the time. Again, it looks darker than it actually was.