Hail is a good reflector of energy and will return very high dBZ values. Doppler radar can see not only the precipitation in a thunderstorm (through its ability to reflect microwave energy, or reflectivity ), but motion of the precipitation along the radar beam. 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. The higher the dBZ, the stronger the rainrate. Typically, light rain is occurring when the dBZ value reaches 20. The scale of dBZ values is also related to the intensity of rainfall. 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). KCRG First Alert Pinpoint Radar Closings and Delays 4 weather alerts in effect KCRG First Alert Pinpoint Radar Latest Video News Dubuque sees snow, ice-covered roads News Schools moving to. 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. So, a more convenient number for calculations and comparison, a decibel (or logarithmic) scale (dBZ), is used. Pinpoint Doppler Radar Satellite and Radar Temperature 24-Hour Temperature Change Feels Like Visibility Dew Point Wind Wind Gusts First Alert Forecast Midwest Highs Airport Highs So Far Today. 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. Using a digital processor, it provides the clearest possible picture of severe weather and is accurate to 300 meters at 300 miles. The colors are the different echo intensities (reflectivity) measured in dBZ (decibels of Z) during each elevation scan. Higher Accuracy - The 'Pinpoint 5 StormTrack Doppler' has the highest resolution of any radar in the Mid-South.
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