"Brad Petersen imaged these rays apparently illuminating the undersides of clouds from the l15 freeway in San Diego County, California near to sunrise on 21st March 2004. It is very possible that these are rare reflected crepuscular rays produced by upward going sunrays reflected up from calm water. There is a large body of water 70 miles to the east that was exactly on the line of sight to the sun when the images were taken. Glancing reflections off smooth water are strong and so this is not as implausible as it sounds."
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