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. 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. is the official website for WXIA-TV, Channel 11, your trusted source for breaking news, weather and sports. TONIGHT Mostly cloudy with a chance of showers. Weather forecast and conditions for Atlanta, Georgia and surrounding areas. A chance of showers with a slight chance of thunderstorms this afternoon. A chance of showers and thunderstorms this evening. Rainfall Storm Total Doppler Radar for Cumming GA, providing current static map of storm severity from precipitation levels. The value of the dBZ depends upon the mode the radar is in at the time the image was created. 30041 WEATHER WARNINGS (SEVERE T-STORM & TORNADO) Weather Map ISSUED 403 AM EDT Thu TODAY Partly sunny. Regional Weather Maps ISSUED 305 PM EDT Fri TONIGHT Mostly cloudy. View other Cumming GA radar models including Long Range, Composite, Storm Motion, Base Velocity, 1 Hour Total, and Storm Total with the option of viewing static radar images in dBZ and Vcp measurements, for surrounding areas of Cumming and overall Forsyth county. Notice the color on each scale remains the same in both operational modes, only the values change. Base Reflectivity Doppler Radar loop for Cumming GA, providing current animated map of storm severity from precipitation levels. 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. 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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