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Water and Weather By Kandi Barnard Water and Weather How does the movement affect weather? Water Cycle Air Masses How can air masses be described? What affect do fronts have on our weather? Fronts Tools Symbols How can we measure and record weather factors? How can we display weather data? •The Water Cycle Where does the water go? evaporation • occurs when water is heated by the sun, and becomes water vapor, rising into the air. condensation • • occurs as water vapor cools. water droplets combine with dust and dirt in the atmosphere to create clouds. precipitation • • occurs when clouds become saturated with moisture. the type of precipitation depends on temperature. •Air Masses A huge body of air with the same temperature and humidity, which can form over land and water. An air mass is described according to the temperature and amount of moisture. If an air mass forms… Over land where temperatures are high, it is Over land where temperatures are low, It is Over water where temperatures are high, it is Over water where temperatures are low, it is •Fronts • are created when two air masses meet Cold fronts occur when a cool air mass collides with a warm air mass, pushing the warm air up. They bring brief, strong precipitation and lower temperatures. • Warm fronts occur when a warm air mass moves over a slow moving cold air mass. They bring steady, precipitation and higher temperatures. • Tools for measuring weather • Barometer – air pressure • • Rain gauge – amount of precipitation Wind vane – direction wind is blowing from • Anemometer – wind speed Weather Symbols • High pressure system • • • Warm front Low pressure system Cold front • Stationary front Weather Maps Meteorologists use these symbols to help you know what changes to expect in the weather.