1. By Mr. V. Calzada & Mrs. Swanson

2. Vocabulary 1.Almost all weather occurs in the lowest layer of air, or atmosphere, that surrounds Earth. The atmosphere stretches about 1000 km (620 mi) from the Earth’s surface to outer space. 2.As air warms, its weight, or air pressure, lessens. Air pressure is the force that the particles of air exert on a surface such as the ground. 3.Humidity is the amount of water vapor in the air. 4.Weather refers to the conditions that exist in the atmosphere over a short period, ranging from just one day to perhaps a week. 5.In contrast, climate refers to the average weather conditions in an area over a long period, spanning at least a month and usually longer. 6.A front is a boundary between tow air masses (cold and warm air). 7.Average is an amount over a period of time.

4. Layer of the Atmospher e

5. Sun creates and powers the weather!

6. Weather is constantly changing because the atmosphere is constantly changing.

8. Measuring Atmospheric Conditions Meteorologist observe and measure the following to predict the constantly changing weather: Temperature Air pressure Humidity Precipitation Wind speed and direction

10. Measuring Atmospheric Conditions

11. Current Brownsville, Texas Weather Forecast

12. Measuring Atmospheric Conditions: Homework

13. Air Pressure

15. Weather Map for Brownsville, Texas A front is a boundary between two air masses. A line connecting small triangles indicates that a cold front is approaching. A line that connects half circles indicates that a warm front is approaching.

16. Water in the Air

17. Types of Clouds: Observation of Weather

18. Data Table And Line Graph Weather Weather for Russell Elementary for the Week of 11/30 - 12/4 MeasurementsDay 1Day 2Day 3Day 4Day 5 Time Temperature Rainfall Wind direction/speed Air Pressure Cloud conditions

19. Data Table And Line Graph Weather for Russell Elementary for the Week of 11/30 - 12/4 MeasurementsMondayTuesdayWednesdayThursdayFriday Temperature61