Calm summer weather
The weather on this Monday, June 5, 2023, fits seamlessly into the ongoing series of dry, warm days with a breeze in the lowlands and isolated showers over the mountains. Let a few pictures speak for themselves:
After a wet May, dry weather in some areas
Just a few weeks ago, the weather was wet and cloudy
MeteoSwiss blog for the month of May
In stark contrast to this, we are currently writing here almost daily about the stable, extensive high pressure system over northwestern Europe and the dry bise current that the latter is causing in parts of Switzerland. It is not surprising that the upper layers of soil have already dried out again in some areas. The blog from our colleagues in Geneva is devoted in more detail today to the lack of precipitation:
Further information on the topic of drought:
www.drought.ch
Lack of moisture
Usually, showers and thunderstorms bring regular precipitation at this time of year. This is currently the case in the south and to a lesser extent in the Alps, but not in the lowlands. The formation of showers and thunderstorms requires instability , sufficient moisture and a trigger mechanism to initially set the cloud and precipitation development in motion.
The topography in Switzerland plays an important role in triggering south africa phone number library showers and thunderstorms. Thermals develop so reliably over our mountains and hills at this time of year that there is virtually never a lack of triggering mechanisms for the formation of cumulus clouds. Their further growth into shower and thunderclouds depends on the other two factors.
Temperature difference between
the 850 and the 500 hPa pressure level, a simple measure of instability. 12h forecast of the deterministic HRES model run of the ECMWF.
Temperature difference between the 850 and the 500 hPa the goal is to convert visitors into long-term customers pressure level, a simple measure of instability. 12h forecast of the deterministic HRES model run of the ECMWF.
The instability would certainly be present these days, as the awb directory above map of the temperature difference between the 850 and 500 hPa pressure levels shows. It is a simple but robust measure of the average vertical temperature decrease in the lower to middle air layers of the troposphere. On the northern side of the Alps and in the Alps, the values are in the moderate to high range at 27 to 29 degrees, and in the south they are just about moderate.
