
Trisha Garlatti, of Edison, was one of those lucky ones. As she was driving through South River at about 2:30 p.m. on Tuesday, she caught a glimpse of it and felt compelled to whip out her camera phone. "It was like a rainbow inside a cloud," she said.
Although it's commonly referred to as a fire rainbow, in the scientific world it's known as a circumhorizontal arc. And weather experts call it "cloud iridescence," said Sarah Johnson, a meteorologist at the National Weather Service's regional office in Mount Holly.
Johnson said the conditions have to be right for this phenomenon to form, and on Tuesday those conditions were in play over parts of New Jersey: Thin clouds very high in the atmosphere, tiny ice crystals in the clouds, and sunlight hitting the ice crystals at a certain angle.
"It's basically the same principle behind what we normally see in rainbows," Johnson said. "But instead of dealing with rain droplets with regular rainbows, we're dealing with ice crystals, because these clouds are so high" and the temperatures are very cold up there.
If the clouds are shaped like an arc and the sunlight hits the ice crystals that are in those clouds, "they will refract the sunlight, creating the full spectrum of colored light instead of just white light," the meteorologist said.
Fire rainbows tend to form when thin, wispy cirrus clouds are high in the sky, as they were on Tuesday, about 15,000 feet above the ground, Johnson said. But they also could develop with even thinner clouds, such as cirrostratus clouds.














Comment: The American Meteor Society (AMS) received over 150 reports (event 2083-2016) about a fireball seen over SE Canada and NE United States on Wednesday, June 15th 2016 around 01:29 UT.