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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?

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What is such a "storm" in Your area? (Montreal, Canada, Isuppose) Do You have low pressure areas drifting over Your region often? –  Georg Jul 22 '11 at 15:53
    
Also, how much high, compared to the average UV received, say, at equator at midday (or whenever the sun is at the zennith)? there ought to be some reference measurement to gauge this extra UV radiation –  lurscher Jul 22 '11 at 16:07
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