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by eugenekay 331 days ago
The NEXRAD weather radar system has multiple modes of operation (Volumetric Coverage Patterns) configurable for each antenna site. Each of these is optimized for different weather conditions. The light-blue returns represent humidity in the air (not quite rain or fog) and is usually tuned below the “noise floor”.

Current operating modes: https://www.roc.noaa.gov/branches/operations-branch/current-...