![]() Since hail can cause the rainfall estimates to be higher than what is actually occurring, steps are taken to prevent these high dBZ values from being converted to rainfall. 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. A family in Forsyth County is picking up the pieces in their backyard after a black bear hung out there overnight. 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. Jun May 2023 Summary Precipitation Forecast Average Precipitation Temperature Forecast Normal Avg High Temps 75 to 85 Avg Low Temps 50 to 60 Avg High Temps 20 to 30 Avg Low Temps 5 to 15 Rain Frequency 4 to 6 days Click or Tap on any day for a detailed forecast. 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. View other Cumming GA radar models including Long Range, Base, Composite, Storm Motion, Base Velocity, and 1 Hour Total with the option of viewing animated radar loops in dBZ and Vcp measurements, for surrounding areas of Cumming and overall Forsyth county, Georgia. The other scale (near left) represents dBZ values when the radar is in precipitation mode (dBZ values from 5 to 75). Rainfall Storm Total Doppler Radar for Cumming GA, providing current static map of storm severity from precipitation levels. ![]() 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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