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12-Sep-2015 20:10 by 7 Comments

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S., forecasters use a set of rainrates which are associated to the d BZ values.

The colors are the different echo intensities (reflectivity) measured in d BZ (decibels of Z) during each elevation scan."Reflectivity" is the amount of transmitted power returned to the radar receiver.Reflectivity (designated by the letter Z) covers a wide range of signals (from very weak to very strong).So, a more convenient number for calculations and comparison, a decibel (or logarithmic) scale (d BZ), is used.The d BZ values increase as the strength of the signal returned to the radar increases.Each reflectivity image you see includes one of two color scales.

One scale (far left) represents d BZ values when the radar is in clear air mode (d BZ values from -28 to +28).

The other scale (near left) represents d BZ values when the radar is in precipitation mode (d BZ values from 5 to 75).

Notice the color on each scale remains the same in both operational modes, only the values change.

The value of the d BZ depends upon the mode the radar is in at the time the image was created.

The scale of d BZ values is also related to the intensity of rainfall.

Typically, light rain is occurring when the d BZ value reaches 20. Depending on the type of weather occurring and the area of the U.