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Foehn wind
| The figure shows what happens when an air parcel with a temperature of 20 degrees centigrade and a relative humidity of 57% is forced to cross a mountain range with an altitude of 2 500 m. The dew point is reached at 900m and clouds are formed. The air is cooled by approximately 1 degree centigrade per 100 metres until the dew point is reached. Above the condensation level the air is cooled at a lapse rate of 0.5 degrees centigrade per 100m. So the temperature of the air at the top of the range will be 3 degrees centigrade.
Credits: ESA | |  |  | |
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| | Foehn BackgroundExercises IntroductionPhotos from the planeMeteosat imagesNOAA imagesCloud filmSurface mapsJet StreamInterview with co-pilotSimulation of the
Foehn situationFind other examplesLinks Satellite images from SareptaMETEOSAT images from EUMETSATSurface mapsInternet Weather sourceNOAAEuropean weather chartsJet StreamForecast Charts for the Jet StreamVideos Cloud videoLakes of Albani and Nemi videoPlains of Po river valley and foothills of the Alps videoCloud cover south of Hanover, Germany videoDevelopment of weather systems animationInterview with co-pilotMathematical simulation of foehn
situation, 15-16 March 2000Eduspace - Download LEOWorks 3
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