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| | The Ultimate Disaster - American History Information Guide and Reference (Site not responding. Last check: 2007-08-19) |
 | | Avalanches are a major danger in the mountains during the winter as a large one can run for miles, and can create massive destruction of the lower forest and anything else in its path. |
 | | For example, in Montroc, France, in 1999 300,000 cubic metres of snow slid on a 30 degree slope, achieving a speed of 100 km/h. |
 | | When such a storm is accompanied by winds above 32 mph that severely reduce visibility, it becomes a blizzard. |
| www.historymania.com /american_history/Disaster (2857 words) |
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