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What is weather? Weather consists of the conditions of the atmosphere at a particular time and place.

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Presentation on theme: "What is weather? Weather consists of the conditions of the atmosphere at a particular time and place."— Presentation transcript:

1 What is weather? Weather consists of the conditions of the atmosphere at a particular time and place.

2 Climate Climate is the general weather of an area over a long period of time, and includes seasonal changes in weather.

3 Factors Affecting Weather 1.Air Pressure 2.Heat Energy 3.Wind 4.Moisture

4 Air Pressure Air Pressure is a measure of the weight of air pressing down on a given area of the Earths surface. Changes in air pressure tell you that changes in the weather are on the way. Low pressure means cloudy, rainy weather, and when air pressure is high, it means sunny, fair weather.

5 Wind Differences in air pressure cause wind, or moving air. Air moves from areas of high pressure to areas of low pressure. The greater the difference of air pressure the faster the wind blows. An anemometer measures the speed of wind.

6 Heat Energy Heat is the transfer of thermal energy from a hot object to a cooler one. 3 Ways: 1.Radiation 2.Convection 3.Conduction

7 Radiation Radiation is the direct transfer of energy by electromagnetic waves. You cannot see infrared radiation, but you can feel it as heat!

8 Conduction Conduction is the direct transfer of heat from one substance to another.

9 Convection Transfer of heat energy in a fluid, in which warmer fluid rises and cooler fluid sinks.

10 Moisture Precipitation happens when water vapor condenses, and the drops of water in the cloud grow larger. Eventually, the heavy drops fall back to Earth as rain, snow, sleet or hail. Condensation: Transpiration: Evaporation:


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