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. Click on the Layers menu in the bottom right of the radar to select radar. Spanish translations, when available, are courtesy of the NWS San Juan Weather Forecast Office. These values are estimates of the rainfall per hour, updated each volume scan, with rainfall accumulated over time. Track rain, storms and weather wherever you are with our Interactive Radar. There are no tropical cyclones in the Atlantic at this 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. View the latest weather forecasts, maps, news and alerts on Yahoo Weather. 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). , Radar Meteorology, University of Miami, Miami. One scale (far left) represents dBZ values when the radar is in clear air mode (dBZ values from -28 to +28). , Radar Meteorology, The University of Chicago Press, Chicago.

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. Miami FL radar weather maps and graphics providing current Composite weather views of storm severity from precipitation levels with the option of seeing an. 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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