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Why is there a difference between the rainfall measurements and the colours on the radar image?

April 26, 2017Colours difference image measurements radar rainfall

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Why is there a difference between the rainfall measurements and the colours on the radar image?

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The radar reflectivity is strongly dependent on the diameter of raindrops in the cloud not the amount of rain drops and therefore rainfall rates. Tropical maritime rainfall consists of very many moderate sized raindrops so that the reflectivity is much less than for similar rainfall rates in continental area rain clouds. The latter rain clouds typically consist of very large raindrops but much less in number.