Crown snow-load
From FIS Freestyle wiki

Crown snow-load is snow and hard rime accumulating on tree crowns and structures in a cold climate. Hard rime is formed when droplets of fog or low level cloud (Stratus) freezes to the windward (wind-facing) side of tree branches, buildings, or any other solid objects, usually with high wind velocities and air temperatures between -2 °C (28 °F) and -8 °C (18 °F). Especially when a warm front brings wet snow, the surface of the tree is colder than the snowflakes, and the latter attach to the tree crown.
Crown snow-load is snow and hard rime accumulating on tree crowns and structures in a cold climate. Hard rime is formed when droplets of fog or low level cloud (Stratus) freezes to the windward (wind-facing) side of tree branches, buildings, or any other solid objects, usually with high wind velocities and air temperatures between -2 °C (28 °F) and -8 °C (18 °F).
Especially when a warm front brings wet snow, the surface of the tree is colder than the snowflakes, and the latter attach to the tree crown.
[edit] Also see
Return to Snow and Weather Glossary, Working with Snow, Freestyle Skiing