The composite reflectivity is the maximum dBZ reflectivity from any of the reflectivity angles of the NEXRAD weather radar. The reflectivity on individual PPI angles show the precipitation intensity at that specific angle above the horizon. Some of these angles are .5, 1.45, 2.4, and 3.35 degrees with the Doppler radar having up to 14 angles when it's in Severe Mode. In the Composite, the highest intensities amongst those available in the different angles above each point of the image will be displayed. In the Canadian weather radar network, this is called MAXR, for Maximum reflectivity in the column.
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