NOVATO, Calif. (KRON) — Strange cloud formations were recorded in the Bay Area against a clear blue sky on Monday.
In images sent by KRON4 viewers, you can see different types of unusual clouds that formed:
On Monday night, KRON4 viewers in Walnut Creek sent us more cloud images that resembled a flying saucer.
What is happening?
KRON4 meteorologist Mabrisa Rodriguez says the long cloud formation is called cloud iridescence, also known as rainbow clouds. They form when small water droplets or small ice crystals within the cloud scatter the sun’s light.
The flying saucer- looking clouds are called Altocumulus Standing Lenticularis clouds.
According to the National Weather Service, they form “when sufficient moisture is present above mountain-top level, ACSL clouds develop within the crest of these mountain waves where the air is rising.”
Even though they appear to remain suspended in one spot in the sky, winds are actually moving through the clouds swiftly, NWS explains.
The shape of the cloud has also been described as “a stack of pancakes.”