Abstract
DR. H. VON PICKER has made notable additions to our knowledge of Fohn by his contributions on this subject to the Transactions of the Vienna Academy. His researches showed that the Alpine Föhn is the local manifestation of an extensive phenomenon which is revealed almost simultaneously in places of the same altitude over a large region. In a paper in the Sitzungsberichte of the Vienna Academy, May, 1912, he describes observations on Föhn during three balloon ascents from Innsbruck in igioand 1911. It was found impossible to make ascents at the time of actual Föhn at the surface owing to the very gusty character of this wind. In one ascent only was the balloon pver the mountains at the time of Föhn, and then it was the plaything of the vertical currents, which, however, were kind enough to spare the balloonists actual disaster. At one time the balloon was carried downwards 900 m. and up again 1100 m. in the course of five minutes, indicating vertical currents of five metres per second or more. Such information is clearly of importance to aviators, apart from its bearing on the elucidation of the meteorological phenomenon.
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GOLD, E. The Upper Air During Föhn . Nature 91, 282 (1913). https://doi.org/10.1038/091282b0
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DOI: https://doi.org/10.1038/091282b0