Definition: Supercooled drizzle: Drizzle where the temperature of drops is below 0 °C.
Drops of supercooled drizzle may freeze on impact with the ground, in-flight aircraft or other objects. This is called freezing drizzle.
The text enclosed in grey-shaded boxes, like this example, comprises Annex I to the Technical Regulations (WMO-No. 49) and has the legal status of standard practices and procedures.