Additionally, normal or average water equivalent values for the time of observation are important for comparison. Alternatively, if absolute values are unavailable, a categorical indication of water equivalent with respect to average is desirable. Categories are defined in Table 1.
Categorical information can be for either points or regions.
Either the specific location of individual points or delineations of applicable regions should be provided. In order to relate snow depth to water equivalent, an estimate of snow density would be most useful. In areas with little or no snow, soil moisture is probably one of the most significant indicators of potential spring flooding. This is especially important, since we try to provide a national assessment of the threat of flooding, including those areas with no snow. While quantitative information is difficult to obtain, categorical information or estimates made for use in hydrologic models can be helpful.