Weird sky and Groups of UFOs. june 2nd 2009

Today the sky turned totally weird. I never saw a sky with such stange clouds in my life. Later suddenly several groups of UFOs crossed the sky. They seemed to rotate and kinda change shape. I watched two of them who seemed to change their color. One turned from black into green and another one from black into red. I watched one UFO which was also round but bright like the sun. It moved quickly into the opposite direction. I was not able to catch it with my camera because. Recently I`ve often seen UFOs in connection with chemtrails but they looked totally different. And I`ve seen an UFO about 25 years ago which was similar to the bright one which I could not record today.
However today I had a feeling that these objects were there to check out the weird sky. What do you think it was?