Our friend Matthew Chin in Hong Kong got in touch about a series of cloud shadow photos, taken by his friend Cammy Li (Star Cammy on Facebook). Cammy took the photos on September 10, 2017 at 7:55 a.m. HKT. These are shadows cast from cloud to cloud.
Here is Cammy’s original post on Facebook:
Matthew, who writes a blog on sky optics, created the two images below as an explanation of the shadow’s source. He also points to Les Cowley’s discussion of cloud shadows, on the wonderful website Atmospheric Optics. And, as we so often do, we ran this entire post past Les Cowley in advance for his stamp of approval. His comment about Matthew’s explanation:
Bottom line: Photos of cloud shadows over Hong Kong, September 10, 2017, by Cammy Li. Explanation by Matthew Chin.
Deborah Byrd created the EarthSky radio series in 1991 and founded EarthSky.org in 1994. Today, she serves as Editor-in-Chief of this website. She has won a galaxy of awards from the broadcasting and science communities, including having an asteroid named 3505 Byrd in her honor. A science communicator and educator since 1976, Byrd believes in science as a force for good in the world and a vital tool for the 21st century. "Being an EarthSky editor is like hosting a big global party for cool nature-lovers," she says.