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echo: science
to: MILES MAXTED
from: DAVID WILLIAMS
date: 2004-05-23 19:55:16
subject: Re: 11+

-> For day after day !   They had just replaced a daily changing  
-> "burn time" forecast with the UV Index,  and for two months or so  
-> the new, abstract index stayed unaltered on 11+... 
   
I guess it depends on how big the "+" is. I wonder why they don't 
quote higher numbers: 12, ... 15, ... 30! 
  
-> This may well be very good news for you and yours - but let's hear  
-> how the index performs after the solstice;  here in NZ, things are  
-> hottest (or coldest) in the two months after the solstices... 
  
Here, too. But the UV Index doesn't depend on the temperature. It does 
depend on the angle of elevation of the sun in the sky, which would be 
highest at the summer solstice, and also on things like ozone depletion 
and atmospheric haziness, both of which would tend to let more UV through 
a bit *before* the summer solstice. 
  
Incidentally, you can take a look at the website that is run by The 
Weather Network, which is Canada's weather-specialist TV channel. The 
address is www.theweathernetwork.com. I imagine that the UV indices in 
various Canadian cities would be quoted there. 
  
                           dow 
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