Late afternoon sky

We made a short day trip north and on the way home noticed that the clouds and sky were looking wonderfully different.  The clouds had the look of speed and although they weren't moving rapidly across the sky they covered the sun at that point but thinned out on the edges and lookedd very whispy.  We had t take a few pictures and keep an eye on the sky for about 45 minutes from the first shot to the last.  The clouds changed very little, but the afternoon colors as the sun set were amazing.