Everytime I check the weather news and storms are announced, the UV index is very often (if not always) "very high" or "extreme", why is that?
If you check the process of storm creation, you can understand that.
The atmospheric pressure of storm's outside is very high, and the pressure of eye of storm is very low.
Because of the atmospheric pressure of storm's outside is very high, the sky is very clear.
So the UV index goes high.
(For someone who can't understand the reason why if the sky is clear, UV index goes high.)
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