Quote:
Originally Posted by MrB
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Weather radar is down in the microwave end of the spectrum, actually most radars are. That's why they're affected by the weather, and precisely why they're designed the way they are. They're reflected by the raindrops, not refracted (for the most part). Once the wavelength reaches the average drop size and larger, then the radio waves pass straight through the clouds and raindrops unhindered.
Near UV is refracted quite markedly by raindrops, more so than blue/violet light, but Far UV is refracted less so because of the higher energies involved. It's the same with IR, but because of the opposite characteristics of IR...the longer the wavelength, the less refracted it becomes.