bratu gismu

x₁ is hail/sleet/freezing rain/solid precipitation of material/composition including x₂.

This is the substance, not the act or manner of its falling, which is carvi. See also carvi, snime, bisli, tcima.

In notes:

bisli: x₁ is a quantity of/is made of/contains ice [frozen crystal] of composition/material x₂.
carvi: x₁ rains/showers/[precipitates] to x₂ from x₃; x₁ is precipitation [not limited to 'rain'].
snime: x₁ is made of/contains/is a quantity/expanse of snow.
tcima: x₁ is weather at place/region x₂; (adjective:) x₁ is meteorological.
bratybakfu: ba₁=br₁ is a hail stone.
bratycarvi: c₁=b₁ hails to c₂ from c₃.
selbratu: x₂=b₁ is hail/sleet/freezing rain/solid precipitation of material/composition including x₁=b₂.
bratuca: x₁ is hail/frozen rain falling on/to x₂ from x₃