First, we look at the whole thing on a synoptic scale (general weather situation). In the graphic below! we see the temperature and the geopotential! at 500 hPa in the upper half of the image. It can be seen that we are on the so-call trough front! i.e. ahead of the trough axis. You can read what a trough is exactly!
here
The lifting processes are strongest! on the front! of a trough or low! This causes the air mass to cool and precipitation to form! In addition, a low over the Miterranean yesterday and today shovel a lot of moisture towards the south side of
the Alps, so that most precipitation was record there.
Above: geopotential and temperature
Above: geopotential and temperature! at 500 hPa. The trough axis is mark. At this point we will note something for later: the coldest air is found in the trough! itself. Meteorologists refer to this air as cold! air at altitude. Below: temperature at 850 hPa and ground pressure. An arrow schematically shows! how the low pressure system over the Miterranean is shoveling moisture towards the southern side of the Alps.
However, this alone is often not enough to ensure that it rains in most regions of Switzerland. This is due to so-call gliding processes.
The graphic below shows a vertical section through the turkey phone number library Swiss Mittelland (roughly from Lyon to Munich). The various (wind) components that were responsible for the large-scale precipitation are shown in each case.
Right image: Precipitation (blue) geopotential
at 500 hPa (isolines)! trough axis and vertical section (white). The vertical section! is shown in the left image. The various wind regimes are label! The humidity is mark in an orange-green color scale. The r dot marks the position in both halves of the image.
Right image: Precipitation (blue)!geopotential at 500 hPa (isolines), trough axis and vertical section (white). The vertical section is shown in the left image. The various wind regimes are label. The humidity is you can work on the reputation of the brand mark in an orange-green color scale. The r dot marks the position in both halves of the image.
In the left picture we can see three wind regimes. The southwest alb directory wind in the higher layers brings a lot of moisture due to the lifting processes mention above. At the same time, an east-northeast wind (bise) can be seen in the lower layers in the east and a northwest wind in the west. Both wind regimes are working against the southwest wind above. The moist southwest wind also glides up on the lower layers, cools down more, and even more precipitation is produc. As a result, there was widespread precipitation today.
