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). 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. 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. “That is when those new radars really shine and where they help us out.The colors are the different echo intensities (reflectivity) measured in dBZ (decibels of Z) during each elevation scan. “Especially when the weather is bad,” Hall says. I think if you asked any meteorologist that works in any of those markets, they would say this is so helpful.” Pope says Climavision is putting up more radar systems “exactly where we all need them. “We are fortunate we have this access that other stations in our market don’t.” “We did a whole marketing campaign around the launch of it,” says Cory McRae, WXII’s creative director. The added radar capabilities give subscribing stations an edge in their weather branding. So instead of seeing three sweeping arms, you are going to see four now and one of those is that Climavision radar.” Cory McRae “We still need the national weather service radars, but this is just another layer. “I just have another choice now,” she says. Pope says The Weather Company integrates the new radar seamlessly into her weather presentation. “We have it overlaid with other radar sites. “That has been the really cool part about it,” he says. Hall says the Climavision radar data integrates into the station’s animation and graphic display easily. The station took that information to interrupt normal programming with live cuts-ins telling viewers, “we have trees down in every county, get ready.”
“I put that Climavision radar right on it and it was giving me wind estimates of 50 miles an hour.” “The national service radars were giving readings of 20 to 30 miles an hour,” Pope says.
Pope tells a similar story about a severe thunderstorm system in her area with winds estimated at 70 miles per hour. The low-level scans of these new radars are where they really shine.” In the first images we got of that tornado, we could see a very clear debris signature that the other radars further away couldn’t make out. “We had a confirmed tornado go through a portion of our viewing area that was very close to the newly installed radar. Hall says the day WRDW first turned on the radar was a severe weather day in Augusta. So I would say it’s crucial as a meteorologist to have that view - when you don’t have that view, you are flying somewhat blind.” I have spent the last 25 years in either the Charlotte or Winston Salem market and in both of those markets we had that radar gap where we are sort of in between weather services radars. “It gives us an ability to see things that are a lot closer to the ground. “When I heard we were going to get something in a location we really needed it, I was thrilled,” says Lanie Pope, chief meteorologist at WXII, Hearst’s NBC affiliate in Winston-Salem, N.C. “It was put in a very strategic spot to where it filled in the radar gap in our area,” says Riley Hall, chief meteorologist for WRDW, Gray’s CBS and MyNetworkTV affiliate in Augusta, Ga.
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TV stations that have signed up for the service say the location of the Climavision radars is critical. “These weather radars are augmenting the existing government NEXRAD radars focused on filling the low-level gaps that exist between those systems,” says Chris Goode, CEO of Climavision, which is partnering with The Weather Company, to make its network of radars available to broadcasters on a market-exclusive subscription basis.
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