Azimuthal Shear

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Azimuthal shear is calculated using a Linear Least Squares Derivative method (LLSD; Smith and Elmore 2004) on radial velocity data from individual radars and then blended into a large multi-radar mosaic for the contiguous United States (CONUS). The blending process results in a field of maximum shear.

To create the products, raw velocity data from a single radar (Fig. 1) are first passed through a 3x3 median filter to reduce spurious noise in the raw velocity data.

 

https://vlab.noaa.gov/web/wdtd/-/azimuthal-shear