Weather is the driver of all avalanche activity. Weaker layers in the snowpack are created by temperature changes, precipitation and solar radiation. Snow slabs, which are the cause of the majority of avalanche accidents are laid down by a mixture of fresh or blown snow and wind. Backcountry travellers need to have both a seasonal and a short term view of the local weather. Short term to know what snow has fallen over the last 24 to 72 hours, the temperature and from which direction and how strong the wind was blowing. Seasonal to have a mental picture of the layers in the snowpack. Early season snow followed by a cold snap creating depth hoar for example.
Weather.Com provides 10 day forecasts for many French towns.
Richard Lawson tipped us off to the American Army European Theatre weather charts, The green circles (rain) should turn to blue stars (white stuff) when they reach the alps. Another Richard (Humphreys) says he has found the European Medium Range Weather Forecast helpful for timing skiing trips.
Avalanche Net is a French site which offers 7 day forecasts and snowdepths.
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