Weather and climate. Britain's climate. UK water supply. When the warm air rises, it cools and condenses to form clouds, which brings rain. Once the air has passed over the mountains, it descends and warms. This creates drier conditions known as a rain shadow. Convectional rainfall Convectional rainfall usually occurs during the summer in the UK, when the sun heats the land. Condensation is a process in which the water vapor a gas held in the air is turned back into water droplets a liquid , and fall as rain.
This cooling turns the water vapor to condense, and as the vapor condenses, the cloud is formed. The cloud receives vapor until the point it can hardly store anymore. The cloud, therefore, being saturated begins to precipitate. Precipitation has many forms depending on temperature. It can be rainfall, Virage, drizzle, mist hailstones, sleet, or snowfall.
The rain is the most common form. The rain or precipitation flows into rivers and streams, and these rivers and streams eventually flow into the sea where the cycle begins again. Orographic or Relief Rainfall and its Features Relief rainfall occurs very frequently near mountains beside the sea because of the ascent of air forced by the mountain barrier. Occurrence, Causes and Effects. And Process of Formation. Related Posts When the water droplets in clouds grow to a certain size, gravity causes them to fall because of their own weight.
In this type of rainfall warm moist air encounters colder more dense air at regions we call fronts. Because the warm air is less dense since it has more energy it is forced to rise above the colder denser air. As the warm air rises it cools, water droplets within it condense and clouds form.
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