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Mr Boland Geography Water vapour is moisture in the form of gas in the air Relative humidity is the percentage of water vapour in the air. Warm air holds more water vapour than cool air. Condensation happens when the air becomes saturated and the tiny water droplets become clouds. Cirrus clouds Cumulus clouds Stratus Cirrus clouds are wispy clouds very high in the sky and look like a painters brushstroke. They indicate fair weather. Look like cotton wool. Found at middle altitudes Sometimes bring showers Stratus clouds are low thick layers of dark clouds that cover an area like a blanket. These clouds can bring long spell of rain and drizzle. 1 2. 3 Precipitation happens when air is forced to rise cooling the water vapour into tiny droplets. Precipitation is all types of water that falls from the sky such as rain, snow, sleet, hail stones. Rain is the most common. The three main types of rain are 1. Relief 2. Convectional Rain 3. Cyclonic Rain Types of Rain Hot air rises! How do the hills & mountains cause rain?? Why is there no rain on the east of the Cascade Range??? Moist air is forced to rise over mountains. As air travels up the windward side it gets colder and forms clouds and rains. Clouds lose most of there rain before it go over the mountain so there is less rain on the leeward side of the mountain This is called the rain shadow Relief Rain Relief rain What are at the areas of dark blue? Why does the area around Dublin have the least amount of rainfall. Relief Rain in Ireland Describe what is happening in this diagram?? Where about in the world do we get this rainfall?? Convectional Rain Occurs when warm air rises very quickly. This is common during a warm Irish summer or on the equator. 1. The sun heats the earth. 2. The hot air over the land rises quickly. 3. As the air rises it cools. 4. It forms cumulus clouds and there are heavy showers. This rain is associated with low pressure systems like a depression. It forms as warm and cold air masses meet. Warm moist air rises cools and rains. Frontal rain