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National doppler radar loops11/7/2023 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. Unless otherwise noted, the images linked from this page are located on servers at the National Headquarters of the National Weather Service. See a real view of Earth from space, providing a detailed. 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. Current and future radar maps for assessing areas of precipitation, type, and intensity. Our interactive map allows you to see the local & national weather. The higher the dBZ, the stronger the rainrate. See the latest United States Doppler radar weather map including areas of rain, snow and ice. 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). 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. Also details how to interpret the radar images and. Reflectivity (designated by the letter Z) covers a wide range of signals (from very weak to very strong). Provides access to meteorological images of the Australian weather watch radar of rainfall and wind. "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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