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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:
> 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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