1. Dynamic Earth : Weather Systems © 2008 Michael Doig Day 1 - Weather Instruments

2. © 2008 Michael Doig The term weather describes the state of the air at a particular place and time. Weather can change from minute-to- minute, hour-to-hour, day-to-day, and season-to-season. Weather

3. © 2008 Michael Doig

4. Climate © 2008 Michael Doig The normal pattern of weather experienced in a particular area over a long period of time is known as the climate. For example, tropical countries have hot climates and the Antarctic has a cold climate.

5. © 2008 Michael Doig

6. Temperature, pressure, air movement, and moisture are the four critical factors that determine weather. 4 Weather Factors

7. © 2008 Michael Doig Latitude, proximity to water, proximity to mountains and elevation are four critical factors that determine climate. 4 Climate Factors

8. Daily Weather Variables © 2008 Michael Doig Date & Time - Calendar & Chronograph Temperature - Celsius Thermometer Air Pressure - Barometer Relative Humidity - Psychrometer Dew Point - Dew Point Apparatus Rain - Rain Gauge Wind Speed - Estimate Wind Direction - Weather Vane Visibility - Estimate

9. © 2008 Michael Doig Temperature

10. © 2008 Michael Doig

12. Air Pressure

13. © 2008 Michael Doig

14. Humidity

15. © 2008 Michael Doig

17. Page 31 0 mph - Smoke rises 1-3 mph - Smoke drifts 4-7 mph - Flags stir 8-12 mph - Leaves move 13-18 mph - Tree branches move 18-24 mph - Trees sway 25-31 mph - Flags beat 32-38 mph - Flags extend Estimating Wind Speed

18. Station Models © 2008 Michael Doig A station model is a symbolic illustration showing the weather occurring at a given reporting station.weather reporting station Meteorologists created the station model to plot a number of weather elements in a small space on weather maps.weather maps

19. © 2008 Michael Doig