FZRA - What does FZRA stand for? The Free Dictionary
References in periodicals archive
As you move from the cold side to the warm side, precipitation type changes from SN to PL to FZRA to RA.
Those that melt all the way become rain and fall into the cold layer below to become FZRA.
When these drops fall into a layer cold enough for the nucleus to re-activate, then the FZRA drop will refreeze into a pellet.