Much like its cousin freezing rain and freezing drizzle, freezing fog is a layer of supercooled cloud
In the dry season, a larger fraction of the precipitation will be produced in the mixed-phase region, by riming of supercooled cloud
droplets onto ice particles and by migration of water vapor to liquid water and ice particles.
They chose 62 miles because that is the distance it takes an aircraft to reach 10,000 feet, where many of the supercooled cloud
layers are located.
Aircraft measurements in CalWater-1 showed that clouds in pristine air masses with dearth of ice nuclei were devoid of ice and snow and had persistent supercooled cloud
and rainwater down to -21[degrees]C (Rosenfeld et al.
In the introduction, we gave examples of the shortcomings of current models in representing vertical profiles of aerosol, boundary layer cloud occurrence, mean ice water path, regional radiation biases, and the radiative impact of subvisual cirrus and midlevel thin supercooled cloud
With supercooled clouds
that are colder than about -5C you seed them and you simply make all those little water droplets that are so annoying turn to ice crystals which then grow big enough to precipitate.