atmospheric optics

A few days ago i witnessed a real life example of atmospheric tunnelling. Due to warm air over cold waters, the skyline of La Rochelle was faintly visible over 50 km away, despite it being normally below the horizon. I've seen this kind of optical phenomenon precisely twice. The air is usually...

As the upper air moisture was building for our next storm in the Central Valley of California, I first caught some normal sundogs, then I noticed the glow of the 120° parhelion over my right shoulder, the second one to the north was very faint, but it was there (4th photo). 11:45 am PST, Jan...