Geography

the dominant high pressure area over Great Britain will bring chilly and wet air to the continent and then to the low pressure area above Itlay, Ballkan

a wide-spreading high pressure area is above whole EU. Overall air is sinking down in high pressure areas, which will cause clouds to dissolve. The high pressure area is responsible for most storm fronts.

the high pressure area lies over south-spain, the low pressure area Great Britain. The low pressure area wander from the British islands to Scandinavia. The weather over west and middle EU changes often.

the high pressure areas is sitting over northern Italy and the Balkan - leads to warm and moist air movement over the alps to the low pressure areas above western Europe.

between the high pressure above england and the low pressure area above the mediterranean sea evolves a easterly wind. this wind carries dry and cold air towards Switzerland - leading to cold weather during winter and sunny stable weather in summer.

this weather condition has no prevailing winds. In general, the atmospheric pressure is low. 

In summer the Earths surface can heat up - convectional clouds: can form strong thunderstorms