On Thursday an intense thunderstorm struck Stehekin in the North Cascades National Park in Washington State, USA.  The storm triggered a large and quite dramatic debris flow that  inundated a car park and a number of buildings.  The National Parks Service has put a number of photos of the event on its Flickr page – they rather nicely illustrate the damage that such an event can cause:

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Interestingly, this article explores the possible causes of the landslide, which appears to be larger than is normal in this region.  They speculate that a factor may be recent forest fires in the area, which has left the soil vulnerable to landslides.  This is entirely possible as a causative factor.

Thanks to Ellen Hardy for he pointing this event out to me.