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WEATHER FORCASTS

WEATHER FORCASTS. By Stella Cheng. AIR MASSES. Air Mass- a body of air that has the same temp. and moisture throughout. The properties of air masses depend on where they formed. Maritime air masses are moist. Tropical air masses are warm. Polar air masses are cold.

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WEATHER FORCASTS

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  1. WEATHER FORCASTS By Stella Cheng

  2. AIR MASSES • Air Mass- a body of air that has the same temp. and moisture throughout. • The properties of air masses depend on where they formed. • Maritime air masses are moist. • Tropical air masses are warm. • Polar air masses are cold. • Continental air masses are dry.

  3. Fronts • Front- the boundary between two air masses with different properties • When warm air meets cold air, the warm air slides up, making a warm front. • Warm fronts can bring a slight rain. • When cold air bumps into warm air, the warm air rises into the sky, causing a cold front. • Cold fronts may bring heavy rain or thunderstorms.

  4. Barometer Weather Instruments Meteorologists use barometers to measure air pressure. Anemometer An anemometer records wind speed or wind pressure. The cups catch wind, causing it to spin around. Every time it makes a circle, the wing speed is calculated.

  5. Rain Gauge A rain gauge measures the amount of precipitation in a certain area over a period of time. Thermometer A thermometer measures air temperature.

  6. Weather Radars • A weather radar sends out signals. • When it hits rain, snow, or hail, the signals bounce back. • The signals can create an image of a storm • The Doppler radar can determine the direction the storm is going. • A monitor will show where the storms will hit the most

  7. Beyond the book

  8. Air masses can affect the weather because different air masses differ in temperature, density, and moisture content. • A high pressure system is a mass of cool, dry air that generally brings fair weather. • On maps, Cold fronts normally are lines with shark-like arrow head sticking out. • Warm fronts are lines with half circles sticking out. • Fog can melt snow • Weather radars can be broken by wind • High humidity makes the air damp and sticky.

  9. Even though it has a lot of glaciers, Antarctica is the driest continent on Earth. • When a fast-moving front slows down and stalls it becomes a stationary front. • Stationary fronts often bring several days of cloudy, wet weather that can last a week or more. • a stationary front often brings is several days of cloudy, wet weather that can last a week. • The most rain in one minute is 1.23"

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