Abstract
AbstractThe föhn event of the 8th Intensive Observation Period (20–21 October 1999) of the Mesoscale Alpine Programme is examined at small scale with the help of both instrumental data (especially from a ground‐based Doppler lidar) and of high‐resolution simulation performed with the non‐hydrostatic model meso‐NH. The three‐dimensional characteristics of the flow in the Rhine valley at the beginning of the event are studied. Special attention is given to the interaction between the föhn and a stable air mass, whose presence drives the penetration of the warm and turbulent föhn air to the ground. A quantification of the simulated features of the flow is given in terms of mass budgets over the target area, and a three‐dimensional picture representing the arrival of the föhn air in the Rhine valley area is proposed. Copyright © 2004 Royal Meteorological Society
Published Version
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