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. 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. Additionally, simulated radar is derived from numerical models, and the output may differ from human-derived forecasts. The value of the dBZ depends upon the mode the radar is in at the time the image was created. Note: Radar products are designed for optimal performance on modern desktop and mobile browsers, such as Firefox and Chrome. 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. Use the map search tool if you want to place a location marker on the radar map. The dBZ values increase as the strength of the signal returned to the radar increases. Radar Loops, Wjet-Am Erie PA Doppler Radar Loops Weather - Weather WX doppler radar loops weather and radar loops for Wjet-Am Erie Pennsylvania. 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. 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.The colors are the different echo intensities (reflectivity) measured in dBZ (decibels of Z) during each elevation scan. The value of the dBZ depends upon the mode the radar is in at the time the image was created. Our recently redesigned site highlights air quality in your local area first, while still providing air. The other scale (near left) represents dBZ values when the radar is in precipitation mode (dBZ values from 5 to 75). AirNow is your one-stop source for air quality data. The dBZ values increase as the strength of the signal returned to the radar increases. The colors are the different echo intensities (reflectivity) measured in dBZ (decibels of Z) during each elevation scan.
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