Psuedomonas syringae is a ubiquitous bacteria that has evolved the ability to facillitate the formation of ice crystals, in order to rupture plant cells to access stored starches, by providing a template of sorts on its outer cell surface, which arranges water molecules in the precise lattice pattern needed to readily form ice crystals, greatly accelerating the process, particularly in turbulent conditions, like those found inside a cloud, for instance. These airborne bacteria are apparently responsible for enabling the formation of a fair proportion of the snow and rain that falls to earth, because it’s like that around here. https://www.lukasguides.com/ice-nucleating-bacteria/
