Pogonip Turns Mason Valley into a Winter Wonderland on the Morning of December 18th, 2021

Photojournalist Roberta Bryant wrote:

“What a way to end the year. I knew what it was when I saw very white trees without having snow on the ground.  ‘POGONIP’: I looked it up and found a Wikipedia entry note that pogonip forms only under special conditions: ‘The humidity has to be near 100% as the air temperature drops to well below 32 degrees allowing ice crystals to form in the air. The ice crystals will then settle onto surfaces.’  And it sure did that!”

Roberta’s photography: