What influences weather
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WHAT INFLUENCES WEATHER? PowerPoint PPT Presentation


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WHAT INFLUENCES WEATHER?. 1. The water table : Evaporation – liquid water changes into water vapor (warm air rising) Condensation – water vapor cools to the dew point, and turns to a liquid on solid nuclei (salt, smoke, dirt, dust) Precipitation – rain, snow, sleet or hail fall from clouds.

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WHAT INFLUENCES WEATHER?

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What influences weather

WHAT INFLUENCES WEATHER?

1. The water table:

Evaporation – liquid water changes into water vapor (warm air rising)

Condensation – water vapor cools to the dew point, and turns to a liquid on solid nuclei (salt, smoke, dirt, dust)

Precipitation – rain, snow, sleet or hail fall from clouds


What influences weather

2. Air masses – large volumes of air with the same temperature and humidity

3. Fronts – forms between 2 air masses

1.Cold front – cold air mass pushes a warm (less dense)air mass up

In front is stormy weather

Behind is cool dry weather


What influences weather

2. Warm front – a warm air mass (less dense) slides up and over a cold air mass

In front is rain

Behind is warm humid air

3. Stationary front - warm and cold air masses meet but not enough wind to move them

Many days of unchanging weather


What influences weather

4. Pressure systems

High pressure - air sinks and no clouds form - clear skies (Happy weather)

Low pressure – air rising and forming clouds (Lousy weather)


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