Over the last 30 years, Andorra and northern Catalonia (Pyrenean regions) have frequently been affected by avalanche events having as result more than 11 deaths in Andorra and 40 deaths in Catalonia. Some of these events affected buildings and infrastructure producing multi-million Euros losses. As a consequence, the governments of Andorra and Catalonia have increased their efforts to mitigate the danger and risks associated with avalanche hazard, particularly in urban and ski resort areas; for this reason it is important to have a realistic hazard maps, obtained with an engineering methodology based on historical data, snow-climate analysis and avalanche dynamics simulations. The simulations account for different flow regimes induced by the snow and weather analysis (snow height, snow temperature, spatial distribution and moisture content). The application of thermomechanical avalanche dynamics models consequently underscores the importance of gathering historical data including precipitation records, snow cover data avalanche flow behaviour, including the predominant avalanche flow regime.