What causes drizzle, and what makes it freezing?
Drizzle itself is nothing more than tiny droplets (0.2 0.5 mm in diameter) of water floating down from clouds to the surface. These droplets are bigger than the droplets of water that make up clouds, thus they are heavy enough to fall to the ground. Typically, three things have to take place in order for drizzle to form. First, there must be little to no upward motion. Any sort of updraft will keep these relatively light droplets floating in the air, preventing them from falling to the ground, as is shown in Figure 7.2.
