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I think the rule is PINwheels can only be tiggered by tele skiers. Can anyone verify this?
Rich

John Atkinson wrote:
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Rollers and pinwheels are signs that the upper layers of snow are getting heavier, 
usually either because of warm temps, solar radiation or rain. These phenomenon 
are not generally dangerous in themselves, but hint at changes in the snowpack that 
mean wet avalanches are becoming more likely. 

If you were to get hit by a big one, it could easily take you down, but if you are skiing 
one at a time from safe zone to safe zone, rollers and pinwheels shouldn't be too 
much of a hazard. However, if you are noting these signs and understanding them, 
you should probably be finding an escape route or a different slope, instead of 
worrying how to ski with them. 

John  

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