When the temperature dips below freezing, rainbows vanish, right?
Rainbows require liquid raindrops, and frozen water doesn't do the trick. Yesterday in Alaska, however, a rainbow appeared that seemed to defy the simple laws of physics. John Dean photographed the pale arc over Nome:
© John DeanI seen this at sunset this evening, I first noticed the left hand side then the whole bow, there is a second bow by the streetlight, this is facing north also. The sun had just broke through the clouds as it was setting behind me. I have never witnessed this before here in Alaska
Atmospheric optics expert Les Cowley explains what happened: "This is
definitely a rainbow made by water drops, even though it was so cold. Ice spheres, hail or snowflakes cannot make them because a rainbow needs almost
perfectly spherical, smooth and transparent water drops. This bow is broad, telling us that the water drops were
small. They were also probably quite high up, and might even have been
supercooled below the normal freezing point of water."
Supercooled raindrops can form when droplets of water fall through layers of subfreezing air. Droplets containing specks of dust or even microbes readily freeze as ice crystals form around the impurities. But when rain droplets are especially pure, they can remain in a liquid state even when the temperature drops below freezing.
Hence -- the "supercooled rainbow." High latitude sky watchers should be alert for these rare rainbows as
strange Arctic weather grips the North in winter 2017.
Comment: There's been many cases of strange bird behavior in the last decade. One wonders what unseen changes are going on in the environment to cause them.