This Friday I'll be presenting at the Julian Starfest. My topic is parhelia, like this circumzenithal arc (below) I observed this afternoon around 5:45. My presentation is at 7:00 pm, 17 August, at the Menghini Winery in Julian. More information about this 4 day event is available at the www.julianstarfest.com.
This is the first circumzenithal arc I've seen in summer, and it was probably 100 degrees F when I took the photo. Though it was hot on the ground, there was plenty of ice crystals aloft to make this arc.
16 hours ago