Gee, I wonder what's causing the nucleation.

Everything’s fine with even a silver lining!

What Is ‘Radiation Fog’? The 400-Mile Weather Phenomenon Had Landed In Los Angeles – & Has A Surprising Silver Lining For California Farmers

A dense, low-lying "radiation fog" is stretching 400 miles across California, creating unusual winter weather conditions for holiday drivers.

https://secretlosangeles.com/radiation-fog-over-california/