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
Air Pressure
Heat Energy
Wind
Moisture

4. Air Pressure
Air Pressure is a measure of the weight of air pressing down on a given area of the Earth’s 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:
Radiation
Convection
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: