In the photo it looks as if the clouds had been cut off ceiling. In the foreground cover the white streaks evenly in the sky and then suddenly bright Blue.

last Thursday hohenpeißenberg in Bavaria, but also in other places of southern Germany, the sight of a exact clouds offered, among other things, at the meteorological Observatory edge.

she moved from the middle of Germany to the South, such as satellite images showed. In the course of the day, the clouds stretched out edge to the South of Algeria. In the episode, it was cloudy in much of Bavaria, while in the West of Baden-Württemberg and Swabia in the case of a cloudless sky, the sun was shining.

satellite images with cloud edge

Responsible for the sudden end of the cloud layer, dry air from the stratosphere is reached in the deeper layers of the Atmosphere, reported the German weather service DWD. This happens only in exceptional cases, because, actually, the dry air of the higher altitude stratosphere is separated from the air in the lower troposphere.

Dry air clouds triggers

The troposphere is the layer in which clouds and rain form. Almost all of the water vapor Sahabet in the atmosphere is found there. On Thursday, the moisture content change in the air, however.

Thus, cold polar moved air over Western Europe to North West Africa. At the point where the cold air was warmer areas, formed a narrow but intense jet stream. Jet streams are the strongest naturally occurring winds.

The Wind blew exactly at the point where the moist air in the lower troposphere, and the dry air of the STRATO meeting sphere – and messy-so the actually separate layers of air.

Random a straight line

The very dry air from the stratosphere, which transformed the ice Crystals in the clouds directly to Gas. Experts speak of the Sublimate. In consequence, the cloud cover broke up.

the phenomenon was also on the humidity of different places. In the clouds Munich, for example, was wet, according to the DWD, the entire troposphere up to a height of twelve kilometers. In Sunny Stuttgart, the dry air penetrated up to a height of about six miles and broke the clouds.

to Ensure that the cloud ceiling ended as suddenly, there is a reasonable explanation. The cloud edge was about hundreds of kilometers just due, however, simply to chance.

jme