avalanche hazard increases

………………………………….
Climate and environmental changes associated with anthropogenic global warming are being increasingly identified in the European Alps, as seen by changes in long-term high-alpine temperature, precipitation, glacier cover and permafrost.

In turn, these changes impact on land-surface stability, and lead to increased frequency and magnitude of natural mountain hazards, including rock falls, debris flows, landslides, avalanches and floods. These hazards also impact on infrastructure, and socio-economic and cultural activities in mountain regions.
Margreth Keiler and others, Philosophical Transactions of the Royal Society, Vol 368, issue 1919, May 2010.

avalanche hazard decreases

The SAFRAN/Crocus/MÉPRA software is used to assess the climatology of the avalanche hazard and its sensitivity to climate change. A natural avalanche-hazard index based on MÉPRA analysis is defined and validated against natural avalanche observations (triggered avalanches are not taken into account).

A 15 year climatology then allows a comparison of avalanche hazard in the different French massifs. Finally, a simple climate scenario (with a general increase of precipitation and temperature) shows that avalanche hazard may decrease slightly in winter (mainly February) and more significantly in May/June. The relative proportion of wet-snow avalanches increases.
Eric Martin and others, Annals of Glaciology, Vol32, number 1, Jan 2001, p163 – 167.
………………………………….