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, with a difference of 10 dB Z indicating a 10-fold increase in energy returned.
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|