 Wegener–Bergeron–Findeisen process

Because ice has lower equilibrium vapour pressure than supercooled liquid, a mixed-phase environment can sustain deposition onto ice while liquid droplets evaporate. This is distinct from ice collecting droplets by riming.

The Wegener–Bergeron–Findeisen process is a mechanism of precipitation formation in clouds, particularly related to how ice crystals grow at the expense of supercooled water droplets. This process is an important aspect of cloud microphysics and explains how snow can form in cold clouds. Here’s a breakdown of how it works: 1. **Supercooled Water**: In certain cloud conditions, water droplets can exist in a liquid state below 0°C without freezing.