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. While today has been another hot and humid one, we are starting to see some changes come to our skies. 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. Contact the helpdesk for operational issues. ![]() ![]() Review the Radar FAQ for help with the transition to the new site. The radar products are also available as OGC compliant services to use in your application. So, a more convenient number for calculations and comparison, a decibel (or logarithmic) scale (dBZ), is used. The NWS Radar site displays the radar on a map along with forecast and alerts. 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. Hail is a good reflector of energy and will return very high dBZ values. PAVE LOW III consists of a terrain following radar, forward - looking infrared ( FLIR ) sensor, inertial navigation system, Doppler radar set. The scale of dBZ values is also related to the intensity of rainfall. ![]() This interactive map provides a visual representation of wind speed and. So, a more convenient number for calculations and comparison, a decibel (or logarithmic) scale (dBZ), is used. See a real view of Earth from space, providing a detailed view of clouds, weather systems, smoke, dust, and fog. Reflectivity (designated by the letter Z) covers a wide range of signals (from very weak to very strong). Stay up to date on what's happening in your community with a 24/7 live stream and on demand content from 10TV. The colors are the different echo intensities (reflectivity) measured in dBZ (decibels of Z) during each elevation scan.
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