dB Z

dB Z
   a unit of radar reflectivity used in meteorology. The unit measures the amount of energy returned to a weather radar site as a function of the amount transmitted. The scale is logarithmic, a difference of 10 dB Z indicating a 10-fold increase in energy returned. For display purposes, dB Z values are grouped as follows:
(Level 1, 18-30 dBZ) - Light precipitation
(Level 2, 30-38 dBZ) - Light to moderate rain
(Level 3, 38-44 dBZ) - Moderate to heavy rain
(Level 4, 44-50 dBZ) - Heavy rain
(Level 5, 50-57 dBZ) - Very heavy rain; hail possible
(Level 6, >57 dBZ) - Very heavy rain and hail; large hail possible
   The colorful "radar images" shown on television are actually plots of these levels.

Dictionary of units of measurement. 2015.

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