Last night, the Alpine region was under a high pressure system that was slowly moving east. As the day progress, Switzerland was increasingly affect by a weak southwesterly flow, which brought increasingly warmer air into our country. The actual warm front pass further north.
Surface weather map with fronts for Europe, a satellite image in the background.
Weather situation he ground pressure is shown in white, the satellite image in the background. (Sou
radiation day
Clouds were a rare commodity both at night and during the day. Cirrus clouds occasionally pass by as the extension of the warm front, and in the morning there were also somewhat denser, mium-high cloud fields. This meant that the ground was able to radiate heat well at night, and during the day the sun’s rays
were able to warm the area almost unhinder
ground frost…
Due to the good radiation during the night, the ground temperatures in the lowlands fell to -4 to -7 degrees. The minimum temperatures were slightly lower on larger lakes (eg Geneva), on slopes (eg Locarno-Monti) or in places with mountain winds at night (eg Chur). It was colder in the valleys, however, where pronounc cold air lakes form. The lowest minimum was thailand phone number library measur last night in Andermatt, where the temperature fell by 5 cm to -16.8 degrees.
Swiss map with minimum temperatures on Friday night, measur at 5 cm above degrees.
… and air frost
In contrast to the temperatures on the ground, which are measur at a height of 5 cm, the “normal” temperature is determin at a height of 2 meters above ground. Even at this height, last night’s minimum temperatures were generally below zero degrees.
Swiss map with minimum temperatures on
cooling from below
Why were the temperatures colder at 5 cm last night than roundtable prosecutorial discretion at the icc; spanish international legal podcast at 2 meters? When it is clear at night and there is hardly any wind, the ground loses adb directory heat via radiation. This means that the atmosphere is cool from below. The graph below shows the temperature trend in Bern, both for the 5 cm and the 2 m temperature. As the solar radiation decreas more and more yesterday evening, the earth’s radiation had an increasingly greater influence on the temperature. First the temperature on the ground drops, and with a delay the temperature at 2 meters also drops. The atmosphere itself also radiates heat, but this effect is significantly less than the radiation from the earth’s surface.