Explanation: What's happening to this cloud? Ice crystals in a distant cirrus cloud are acting like little floating prisms. Known informally as a fire rainbow for its flame-like appearance, a circumhorizon arc appears parallel to the horizon. For a circumhorizontal arc to be visible, the Sun must be at least 58 degrees high in a sky where cirrus clouds present below -- in this case cirrus fibrates. The numerous, flat, hexagonal ice-crystals that compose the cirrus cloud must be aligned horizontally to properly refract sunlight in a collectively similar manner. Therefore, circumhorizontal arcs are somewhat unusual to see. The featured fire rainbow was photographed earlier this month near North Fork Mountain in West Virginia, USA.
lasagnaromance on August 31st, 2021 at 10:07 UTC »
Excuse me, rainbow what now?
TorontoHere on August 31st, 2021 at 10:21 UTC »
Oh no, global elites are spraying gay GMO on our children again to activate their vaccines and turn them communist
Spartan2470 on August 31st, 2021 at 12:52 UTC »
Here are more pictures of this. Per NASA APOD:
Edit: Corrected link thanks to /u/enemawatson.