Sometimes snow can show up as yellow or orange as the radar may think it is small hail. Wind direction and mean speed (Arrow size relative to wind speed)Įxtremely heavy rainPurple= Extremely heavy rain or hail. Maximum gust speed and mean wind direction. If the symbol is grey it means there will be gusts of wind. Below are a few sample radar images and color interpretation. Pink: freezing rain or sleet or mix of winter precipitation types. The radar does have some logic built in to help it discriminate between precipitation and non-precipitation targets. If there is a “target” out there and it reflects radar energy back to the radar, the radar will display it as if it was precipitation. Computers analyze the strength of the returned pulse, time it took to travel to the object and back, and phase, or doppler shift of the pulse. This reflected signal is then received by the radar during its listening period. Note: it’s a small fraction of the emitted energy that is scattered directly back toward the radar. This indicates a strongly rotating column of air. Note the bright red, or strong outbound velocities right next to the bright green, or inbound velocities. The radar is located to the southeast, or to the bottom right of the computer screen. There are two main types of data, Velocity and Reflectivity. What do the different types of data on the radar mean? The transition zone between incoming and outgoing winds are indicated the gray-ish colors between the two. In velocity images, red colors indicated wind moving away from the radar with green colors indicating motion toward the radar. The colors are the different radial velocities measured by the radar.
What do the colors on a weather radar map mean?
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