Articles | Volume 3, issue 1
Weather Clim. Dynam., 3, 279–303, 2022
https://doi.org/10.5194/wcd-3-279-2022
Weather Clim. Dynam., 3, 279–303, 2022
https://doi.org/10.5194/wcd-3-279-2022
Research article
25 Mar 2022
Research article | 25 Mar 2022

Is it north or west foehn? A Lagrangian analysis of Penetration and Interruption of Alpine Foehn intensive observation period 1 (PIANO IOP 1)

Manuel Saigger and Alexander Gohm

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Short summary
In this work a special form of a foehn wind in an Alpine valley with a large-scale northwesterly flow is investigated. The study clarifies the origin of the air mass and the mechanisms by which this air enters the valley. A trajectory analysis shows that the location where the main airstream passes the crest line is more suitable for a foehn classification than the local or large-scale wind direction. Mountain waves and a lee rotor were crucial for importing air into the valley.