Lt Yellow and White in Boulder, Colorado:

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"I was standing on 3rd story facing west. Large streaming flash streamed behind the Flat Irons at around 11:05 PM Local time, started roughly 4 finger widths above the mountains and continued behind the mountains.

Very large, maybe half a finger width wide at its widest point. No noise or large flashes, just a large streak extending from 4-5 finger widths above the mountains (maybe 15 degrees above horizon) to behind the mountains."