Why isn't UV Index data available for 24 hours each and every day?
Is there a diurnal ‘rhythm' to the UV Index data? If so, describe it briefly.f. Suppose a 1000 m thick cloud persists for the entire day.
The Weather Network warns: "UV rays can cause sunburns, eye cataracts, skinaging and skin cancer. The higher the UV Index number, the stronger the sun'srays, and the greater the need to take precautions." Which radiation processesare of concern from skinexposure perspective for humans?