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DEVELOPMENT OF A TEMPERATURE-DEPENDENT RADAR REFLECTIVITY TO SNOWRATE RELATIONSHIP FOR THE S-BAND

Weather radar offers a practical way of estimating snowfall rate with high spatial and temporal resolution. Such remotely-sensed snowrates are useful for weather advisory and hydrometeorology. In either application a relationship between equivalent radar reflectivity ( e Z ) and water equivalent snowrate ( S ) is needed. Furthermore, this relationship should be tuned to the location and cloud type of interest. The leading coefficient in the relationship β α S Ze ⋅ = can be shown to vary with temperature-dependent properties of the snowflake size distribution. We describe measurements, and a statistical analysis, leading to a value forα which can be applied to wintertime upslope storms occurring in southeastern Wyoming, and report a positive correlation between α and surface temperature. This temperaturedependence is suggestive of a process which produces an inverse relationship between snowflake concentration and temperature, e.g., primary ice nucleation.