Last evening, the sky in Tucson was an unbelievable pink.  There was a rainbow that I tried to capture, but the depth of the pink did not allow it to show through on the picture.  dig girl described what she saw in the Seniornet Arizona discussion. 

These two pictures were taken from my backyard. The colors changed so quickly, I couldn't get two anywhere near alike.

This was taken from the front of my house looking west.

These were all taken before the rain got to our area of town.  As time went on, the clouds became darker and darker as the rain was approaching. 

Another taken from the front, looking west.  As the sun set, the colors became more distinct.