How to read weather radar chart? What do you mean by different colors?

Blue indicates that the area is covered by precipitation clouds, but it hasn't rained yet; Green means that the area is immersed in continuous drizzle; Yellow to red indicates moderate to heavy rain in this area; Purple indicates that the rainfall intensity is the highest in this area, which is "falling" into a rainstorm, even a heavy rainstorm, and may be accompanied by bad weather such as lightning, strong winds and even hail. "