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WRF snow output variables

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Can you explain the difference between the various snow-related output variables, such as SNOW, SNOWH, ACSNOW, ACSNOM? I'm interested in both the actual snow on the ground (both physical depth and liquid equivalent), as well as the snow accumulation (before it is subject to compaction, melting, etc., of the surface model). Are any of these variables reset at the history output interval? Thanks.