Rutledge Doppler Radar
The colors are the different echo intensities (reflectivity) measured in dBZ (decibels of Z) during each elevation scan. "Reflectivity" is the amount of transmitted power returned to the radar receiver. Reflectivity (designated by the letter Z) covers a wide range of signals (from very weak to very strong). So, a more convenient number for calculations and comparison, a decibel (or logarithmic) scale (dBZ), is used.
The dBZ values increase as the strength of the signal returned to the radar increases. Each reflectivity image you see includes one of two color scales. One scale (far left) represents dBZ values when the radar is in clear air mode (dBZ values from -28 to +28). The other scale (near left) represents dBZ values when the radar is in precipitation mode (dBZ values from 5 to 75). Notice the color on each scale remains the same in both operational modes, only the values change. The value of the dBZ depends upon the mode the radar is in at the time the image was created.
The scale of dBZ values is also related to the intensity of rainfall. Typically, light rain is occurring when the dBZ value reaches 20. The higher the dBZ, the stronger the rainrate. 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.
These values are estimates of the rainfall per hour, updated each volume scan, with rainfall accumulated over time. Hail is a good reflector of energy and will return very high dBZ values. 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.
Isolated Severe Thunderstorms for the Northeast/Mid-Atlantic; Santa Ana Winds for Southern California
Mostly sunny, with a high near 72. West wind 5 to 10 mph increasing to 10 to 15 mph in the afternoon. Winds could gust as high as 25 mph.
Clear, with a low around 46. Northwest wind 5 to 10 mph, with gusts as high as 15 mph.
Sunny, with a high near 68. Northwest wind around 5 mph.
Clear, with a low around 44. Northwest wind around 5 mph.
Sunny, with a high near 70. Calm wind.
Mostly clear, with a low around 45.
Sunny, with a high near 73.
Mostly clear, with a low around 48.
Mostly sunny, with a high near 74.
Partly cloudy, with a low around 51.
Mostly sunny, with a high near 76.
A 20 percent chance of showers. Partly cloudy, with a low around 57.
A 20 percent chance of showers. Mostly sunny, with a high near 74.
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