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. Todays Forecast Mostly Sunny & Very Warm Days. 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. See the latest Alabama Doppler radar weather map including areas of rain, snow and ice. 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). 4 Today Hourly 10 Day Radar Season Birmingham, AL Radar Map Rain Frz Rain Mix Snow Birmingham, AL Slight chance of rain over the next 6 hours. Track rain, storms and weather wherever you are with our Interactive Radar. One scale (far left) represents dBZ values when the radar is in clear air mode (dBZ values from -28 to +28). For the latest Birmingham weather information and central Alabama's certified most accurate forecast, watch WVTM 13 News. Radar Latest Video News Alabama Forward leaders host 'Democracy: Now or Never' event News ALEA urges young driver safety News Black Belt Benefit Group hosts annual Rockin' Rib Off Weather. Each reflectivity image you see includes one of two color scales. CLICK TO SEE THE 7 DAY FORECAST Stay weather aware Get the free WVTM 13 app and turn on the alerts for the latest weather updates. 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). THREE Active Currently: Tropical Depression, approximately 304 mi from yap Forecast Eye Path updated 3 hours ago Live Coverage For all things weather, 24 hours a day. "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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