As we all know, the weather today is determin by high pressure. In the graphic below we have shown the high pressure bridge (when two high pressure areas connect with each other).
Pressure distribution over Europe. A high over the nearby Atlantic has form a bridge-like connection with a high over Eastern Europe.
Pressure distribution over Europe. A high over the nearby Atlantic has form a bridge-like connection with a high over Eastern Europe. (MeteoSwiss)
Now we ne to address subsidence so that we can understand the different views in the lower and upper layers of the atmosphere. Subsidence refers to the large-scale sinking of air masses in a high pressure area. During this sinking movement, the air mass warms up, but a wintry, cold base layer remains in the layer near the ground. This is because the high usually has relatively low wind conditions and the significantly heavier cold air can accumulate undisturb near the ground.
This cold air often remains for several days
and is enrich with aerosols. The most common of these are soot from combustion and stirr up mineral dust, but many other sources on-a-bis-z/aerosole.html) contribute to the entry of particles into the atmosphere. The water in the atmosphere preferentially deposits on these aerosols and forms small droplets. This usually forms a philippines phone number library cloud (if it were on the ground it would be fog). In relatively dry conditions, such as in the current high pressure area, this is usually only enough to create haze. A distinction is also made between dry and moist haze. The former is defin by a visibility of 1 to less than 15 km and an air humidity of less than 75%. In moist haze, the air humidity is 75% or more.
The graph shows the relative humidity
at the top and the visibility at the bottom for this morning. It is clear that there was damp haze over large parts of the Central Plateau.
The graph shows the relative humidity at the top and the literary rentrée: foreign language books not to be miss! visibility at the bottom this morning. It is clear that moist haze lay over large parts of the Central Plateau. (MeteoSwiss)
Shortly after sunrise at Zurich Airport. A hazy base layer germany cell number makes every other forest and hill range in the distance increasingly fade. Horizontal visibility when the photo was taken: 4000 meters.
Shortly after sunrise at Zurich Airport. A hazy base layer makes every other forest and hill range in the distance increasingly fade. Horizontal visibility when the photo was taken: 4000 meters. (Bruno Kunz)
View from Säntis towards Graubünden this morning. The Bernina group, around 108 km away, is clearly visible. (www.roundshot.com)
Some of you are probably thinking: “That’s all well and good, but I’ve seen clearer days in the mountains.” And you’re right. There is still some Sahara dust in the atmosphere today. If you look closely, you can see the rdish shimmer on the horizon in the picture above. This means that the layers above the base layer are not crystal clear either.