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National UFO Reporting Center Sighting Report
Occurred : 12/5/2007 05:30 (Entered as : 12/05/07 5:30)
Reported: 1/27/2008 10:36:56 AM 10:36
Posted: 3/4/2008
Location: Burlington, CO
Shape: Flash
Duration: 5 seconds
We didn't see a UFO or anything, this was an ear-splitting almost explosion-type burst that left the whole horizon a luminous semi-circle of purple.

We had been driving through a snowstorm; it was still snowing so we didn't feel that it could have been lightning; we saw nothing like lightning, only heard a gigantic "wave" of sound similar to the thunder accompanied by lightning, then saw the entire horizon light up in a bright purple hue.

My 3 children and I were just getting off of I-70 west heading to a Denny's at which the waitress admitted she had been witness to the same.