Hail is a good reflector of energy and will return very high dBZ values. These values are estimates of the rainfall per hour, updated each volume scan, with rainfall accumulated over time. Depending on the type of weather occurring and the area of the U.S., forecasters use a set of rainrates which are associated to the dBZ values. (Chapter 31a) Peterson, R.E., 1984: A triple Doppler radar analysis of a discretely. The higher the dBZ, the stronger the rainrate. Typically, light rain is occurring when the dBZ value reaches 20. Precipitation Forecast Loop 72hr Rainfall Forecast 3 Month Rain/Temp Outlook Total Precipitable. Area, Including Zoom In and Out, Pausing, Speed Toggles, and more. The scale of dBZ values is also related to the intensity of rainfall. KIND Indianapolis, Indianapolis Based Nexrad Doppler Radar Station with Enhanced Nexrad Doppler Radar from the National Weather Service for the General Indianapolis, IN. The value of the dBZ depends upon the mode the radar is in at the time the image was created. Notice the color on each scale remains the same in both operational modes, only the values change. The other scale (near left) represents dBZ values when the radar is in precipitation mode (dBZ values from 5 to 75). One scale (far left) represents dBZ values when the radar is in clear air mode (dBZ values from -28 to +28). Each reflectivity image you see includes one of two color scales. The dBZ values increase as the strength of the signal returned to the radar increases. Indy, Indianapolis, Kokomo Weather Radar. So, a more convenient number for calculations and comparison, a decibel (or logarithmic) scale (dBZ), is used. Reflectivity (designated by the letter Z) covers a wide range of signals (from very weak to very strong). 'Reflectivity' is the amount of transmitted power returned to the radar receiver. The colors are the different echo intensities (reflectivity) measured in dBZ (decibels of Z) during each elevation scan.

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