I tried posting one picture of this unique cloud phenomenon June 20 from weather.com, but it didn't come through.  Just found it again, only with bunches of pictures of it.  I knew you all would enjoy these as much as I did.
Make sure to click on "More photos" at the bottom of the page!~~ Kay

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A MOST BIZARRE WEATHER EVENT
 
 "A weather phenomenon filled the skies of Eastern Iowa Tuesday, and meteorologists say it's something we might not see again. Some say it looked like a scene from the movie “Independence Day.”
 
http://view.nowpublic.com/?src=http%3A%2F%2Fwww.illinoiswaters.net%2Fheartland%2FphpBB2%2Fviewtopic.php%3Fp%3D43982%2343982