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CGC1D—Ms. Duff Types of Precipitation Give FOUR examples of precipitation (not in text, but you should be able to find it in your head!) 1. 3. 2. 4. Ok, good, now what causes precipitation? There are, generally, 3 types of precipitation Convectional Precipitation forms when: 1. 2. 3. 4. Sun heats ground Ground is now warm, it heats air above it Warm air rises (cools 1°C per 100m) Clouds develop, when air cools and condenses 5. Heavy rain and thunderstorms occur Relief Precipitation forms when: 1. Warm air is forced to rise over a mountain (cools 1°C per 100m) 2. Clouds develop, when air cools and condenses 3. Rains 4. Air goes down the mountain, and warms again CGC1D—Ms. Duff Frontal (Cyclonic) Precipitation forms when: 1. 2. 3. 4. 5. Cold air mass and warm air mass meet Cold air is heavier, it stays low Warm air is lighter, it rises Clouds develop, when air cools and condenses Rains What are the 2 key points to help us understand why precipitation occurs? 1. 2.