NormalThe long-term average value of a meteorological paramater (i.e., temperature, humidity, etc.) for a certain area. For example, "temperatures are normal for this time of year" means that temperatures are at or near the average climatological value for the given date. Normals are usually taken from data averaged over a 30-year period (e.g., 1971-2000 average), and are concerned with the distribution of data within limits of common occurrence.Normal Water Surface ElevationIn hydrologic terms, the lowest crest level of overflow on a reservoir with a fixed overflow level (spillway crest elevation). For a reservoir whose
outflow is controlled wholly or partly by movable gates, siphons, or other means, it is the maximum level to which water may rise
under normal operating conditions, exclusive of any provision for flood surcharge.Normal YearA year during which the precipitation or stream flow approximates the average for a long period of record.Range NormalizationA receiver gain function in the radar which compensates for the effect of
range (distance) on the received power for an equivalent reflectivity.
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