![]() The purple arrowhead means that intense rotation was detected in the lowest levels of the storm, and therefore has a higher probability that it is actually extending down to the ground. ![]() Thus, it is not likely that this intense rotation has made it to the ground. The purple swirl icon simply means that intense rotation was detected, but it was located in the upper-level parts of the storm rather than near the bottom. Using the Left and Right Arrows, please select the Radar you would like to viewĪreas of particularly strong rotation are indicated by either a purple swirl icon or a purple arrowhead as indicated by the legend on the left-hand side. During high impact events or interesting weather Beau may move the GR Earth radars to areas outside of our local area so you can you follow the event. Please note that at the bottom of each local city radar page you will find additional information and instructions on how to properly use the radar system. To return to the zoomed out view of the map simply press the button that says Click to Unzoom. You can pan around the image by holding down the left mouse button and moving your mouse. Place your cursor on the map image and click the left mouse button. To zoom in and out on the radar please click on the Enable Zoom button under each radar. When the local city radar loads you will be able to use the check boxes at the top of the page to turn the radar features on and off. When you click on an image the system will begin to load the most current weather data. To begin using the radar, choose a map by clicking on one of the images below. 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.Welcome to the Weather Observatory's Online Interactive Radar. 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. 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. The colors are the different echo intensities (reflectivity) measured in dBZ (decibels of Z) during each elevation scan.
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