- anything but boring The supposedly boring temperature inversion shows a closer look some very interesting local and regional weather phenomena. But first to the "facts" of this day: On both sides of the Alps was cloudy. In the north were particularly affected the Midlands and some alpine valleys in the morning were also in the north-west Switzerland some high fog. The ceiling was at about 1100 meters. Also on the entire Southern Alps was a compact layer with low stratus clouds, the ceiling was here but only to about 2400 meters to find. In the morning was also the entire Engadine covered by the humidity, even the Flüelapass was briefly in the morning mist: But now to the specific: In the south, below the inversion at 2,400 meters above a sharply colder air mass than the north. At 1500 meters have been in radio sounding at noon in Payerne / VD measured (representative of the Plateau) +16 degrees, in Milan (representative of the Southern Alps), it was only +4 degrees. Since cold air is heavier than warm, it was the air pressure at the base about 5 to 8 mb (= hPa) higher than on the north side, between Sion and Lugano, the difference was even briefly 9 hPa Accordingly, it is not surprising that the cold air - much like a dam - after gusty on the lower Alpine passes on the main ridge north flowed. In Behind the Rhine at the foot of the San Bernardino least gusts were measured close to 60 mph. The above-mentioned overflow has been documented by some webcams beautiful: |
view from the Tanatzhöhi / GR, 2136m to the east. On the extreme right is that of the cold air flowed over Splügenpass (2115 m). Source: Camera power MeteoSwiss |
streamed For example, on Splügen (see Figure above) a "cold clouds" from the south dynamically over the pass, while sinking north of it they broke up gradually. was above the inversion layer on both sides of the Alps, virtually the same air mass and pressure conditions were balanced. To 3000 meters were registered even some weak northerly winds. A second interesting phenomenon is the source clouds above the Alps above the inversion was de stratified summer stratification of the atmosphere unstable, so formed, especially in the western Alps cumulus clouds. In the southern Valais handed it even - as already yesterday - for weak rain showers. In the Upper Engadine, however, there was the rare image of a layer of stratus clouds with highly basic about it:
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radar image of 16 clock local time. Because of the shadowing the mountains were probably not likely cover all shower cells. source: MeteoSwiss |
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stratus and cumulus clouds: View from the top station of the railway Corvatsch / GR, 3300m to the Maloja Pass and the Engadine. Right of the station is the Roseg the Piz Bernina (4,049 m). Source: Camera power MeteoSwiss |
The paragliders had expressed a joy for the season with good thermals. A pilot could fly cross of Fiesch in Valais, a part of the Valais and Bernese Alps to Interlaken. This is that time of year and, moreover, at a high fog situation probably only very rarely possible. is the track of the flight's here .
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