My most memorable Steve Miller show was where we had an extremely intense storm that soaked us to the bone prior to the show then got to witness mammatus overhead as Steve got on stage.
The band stopped the opening set as they were just as in awe of it as everyone at the venue.
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I have seen this cloud phenomenon only one time, about 3 years ago. I took pictures and called it "sky balls" because I had no idea what it was.