![]() Stated differently, the larger the particle, the more it contributes to the resulting reflectivity factor. Differential Reflectivity is available in two resolutions: a standard product at 1 degree x 0.25 km resolution and a Super-Res product at 0.5 degree x 0.25 km resolution.ĭifferential Reflectivity values are biased toward larger particles. Values near zero suggest that the target is spherical, with the horizontal and vertical size being nearly the same. Positive values indicate that the targets are larger horizontally than they are vertically, while negative values indicate that the targets are larger vertically than they are horizontally. Its values can range from -7.9 to +7.9 in units of decibels (dB). Differential Reflectivity is defined as the difference between the horizontal and vertical reflectivity factors in dBZ units. The Differential Reflectivity (ZDR) product shows the difference in returned energy between the horizontal and vertical pulses of the radar. These data are beneficial in determining precipitation type, filtering non-meteorological clutter, and detecting tornado debris. The dual-polarization upgrades implemented several years ago enable NEXRAD radars to receive both horizontal and vertical data. In its original implementation, NEXRAD could only detect horizontal measurements of objects in the atmosphere.
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