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Composite Reflectivity

Composite Reflectivity

Short Description

The maximum reflectivity in a vertical column using the 3D Reflectivity Cube.

Subproducts

Low-Resolution (5 km) Composite Reflectivity

Composite Reflectivity (0–4 km)

Primary Users

NWS: WFO, CWSU, RFC, SPC, AWC

FAA: TRACON, ARTCC, ATCSCC

Other: EM

Input Sources

3D Reflectivity Cube

Resolution

Spatial Resolution: 0.01o Latitude (~1.11 km) x 0.01o Longitude (~1.01 km at 25oN and 0.73 km at 49oN)

Temporal Resolution: 2 minutes

Product Creation

At each horizontal 2D grid point, the reflectivity value is checked in the vertical grid from the bottom up. Once an “available” data value is found, that reflectivity value is assigned to the composite reflectivity value. As successively-higher altitude grid points are checked, if the reflectivity value is greater than the assigned composite reflectivity value, then the assigned value is replaced with the higher value of reflectivity. This process continues until the highest-altitude grid point is reached.

Technical Details

References

Lakshmanan, V., T. Smith, K. Hondl, G. J. Stumpf, and A. Witt, 2006: A real-time, three dimensional, rapidly updating, heterogeneous radar merger technique for reflectivity, velocity and derived products. Wea. Forecasting, 21, 802-823.

Lakshmanan, V., A. Fritz, T. Smith, K. Hondl, and G. J. Stumpf, 2007: An automated technique to quality control radar reflectivity data. J. Appl. Meteor., 46, 288-305.

Lakshmanan, V., C. Karstens, J. Krause, and L. Tang, 2014: Quality control of weather radar data using polarimetric variables. J. Atmos. Oceanic Tech., 31, 1234-1249.