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Cloud Types Get Your Head Out of the Clouds! Clouds RAIN DROPS KEEP FALLING ON MY HEAD Clouds What are clouds? Clouds are made of teeny tiny itsy bitsy water droplets and dust. The average rain drop is 100 times larger than cloud droplets. How are clouds formed? All air contains water. We call this humidity. Water vapor is an invisible gas. When this water vapor rises it expands and cools. Cool air cannot hold as much water vapor as warm air. The water vapor condenses into water droplets on tiny pieces of dust that float in the air. When billions of these droplets come together they form a cloud. Types of Clouds High Clouds- Cirrus (Above 23,000ft) 2 Middle Clouds- Alto (6,500- 23,000ft) 1 Low Clouds- Stratus (Up to 6,500ft) 1 Clouds with vertical growth Special Clouds 2 2 Types of Clouds High Clouds- Cirrus Cirrus Clouds- Are the most common of the high clouds. Look like thin wispy white clouds. They are usually made of ice. High Clouds- Cirrus Cirrostratus clouds- Are made of ice and create a halo around the sun. Middle Clouds- Alto Altocumulus Clouds- These are middle clouds made of water droplets. They appear as grey and white puffy masses. (Like small little marshmallows) Low Clouds- Stratus Nimbostratus Clouds- Form a dark grey cloud. These clouds are responsible for continuous rain fall. These are the clouds that make you want to stay in bed! Vertical Growth Cumulus Clouds- These are white puffy clouds. (they look like cotton candy) They produce little or no rain. Vertical Growth Cumulonimbus Clouds- Are known as thunderstorm clouds. They produce heavy rain, snow, hail, lightning and are the clouds that create tornados. High winds can flatten the top into an anvil shape. Special Clouds Fog- this is a cloud on the ground. Contrails- These are condensation trails left behind from jets and aircrafts.