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Warm Up The doldrums are an example of a ___________ wind. **Put your yellow card on the corner of your desk! Water in the Atmosphere The Water Cycle The transfer of water between the atmosphere and Earth’s surface. 1. Water evaporates from plants and bodies of water 2. Water condenses in the atmosphere and forms clouds 3. Clouds become saturated and water falls as precipitation to the surface 4. Water runs off surface into lakes, streams and oceans. Humidity The amount of water vapor in the air. Amount of water vapor compared to the amount the air can hold – Relative Humidity Measured with a psychrometer Making a psychrometer Dew Point Condensation = process where water vapor changes into a liquid – The air must be saturated for condensation to occur (100% humidity) and have a surface to condense on. Dew Point = the temperature at which a gas condenses into a liquid. Clouds Forms when water vapor in the air condenses and becomes liquid water or ice crystals. Water vapor must attach to a particle in the atmosphere in order to condense back to a liquid. Types of Clouds 1. Cumulus – look like rounded piles of cotton. Indicate fair weather. – Cumulonimbus = T-storm clouds Stratus – cover most of the sky. May produce drizzle. 3. Cirrus – High wispy feathery clouds. Made of ice crystals. 2. Types of Clouds