![]() ![]() 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. Boydton, VA F Location Radar Satellite Current Conditions Forecast Wind Flow Lightning Smoke Wind Wind Gusts Temperature RealFeel RealFeel Shade Past 24-Hour Precipitation Connecticut Current. ![]() For official historical records contact the National Climatic Data Center. Hail is a good reflector of energy and will return very high dBZ values. Weather Archives Past Data and Maps Disclaimer: The National Weather Service cannot assure accuracy of data found from the sources on this page. These values are estimates of the rainfall per hour, updated each volume scan, with rainfall accumulated over time. The Weather Channel Maps 15 Today Hourly 10 Day Radar Video Classic Weather Maps Follow along with us on the latest weather we're watching, the threats it may bring and. 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. 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). NBC 10 WJAR is the news, sports and weather leader for Providence, Rhode Island and surrounding communities, including Cranston, Pawtucket, Woonsocket. 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. Yesterdays Radar Loop shows areas of precipitation for the prior day. Reflectivity (designated by the letter Z) covers a wide range of signals (from very weak to very strong). The Current Radar map shows areas of current precipitation. "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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