How to look at radar echo map

The radar chart in weather forecast consists of local maps and irregular color blocks, with colors ranging from blue to green, yellow, orange, red to purple. Next to the map, there is the radar station name, time and data range, and there is a vertical color bar marked with numbers. From blue to purple, the numbers are getting bigger and bigger, and the unit of numbers is dBZ. The range of dBZ is 10-70 dbz.

On the radar map, the color indicates the echo intensity of weather radar, and the gradual change from blue to purple indicates that the echo intensity is from small to large, and the rainfall intensity is gradually increasing. DBZ is called reflectivity factor unit, and the higher the value, the greater the precipitation intensity.

Generally speaking, the area corresponding to the blue echo indicates that the local area is covered by precipitation clouds, but it has not rained yet; The area covered by green echo represents the local immersion in light rain; There is moderate to heavy rain in the area covered by yellow to red echo; The area with purple echo has the highest precipitation intensity, and this area is "falling into" heavy rain, even heavy rain, and may be accompanied by severe weather such as lightning, strong wind and even hail.

This is what the radar map in the weather forecast looks like.