1. Chapter 9: Weather Vocabulary
Topic 7 in Textbook/Workbook
Page 126

2. Assignment Due Friday April 11th
All 30 vocabulary words
Words and definitions are to be copied onto loose leaf.
7 Vocabulary Words illustrated
You may pick 7 of the vocabulary words to explain using a picture.
Typed vocab words & clip art pictures will not be accepted.
This assignment will count as a test grade!

3. Example
Precipitation 

4. Vocabulary Words

5. Air Mass
A large body of air in the troposphere with similar characteristics of pressure, moisture, and temperature

6. Air Pressure Gradient
The change in air pressure over a given area.

7. Anemometer
A weather instrument used to measure wind speed.

8. Atmospheric, Barometric, or Air Pressure
The weight of the overlying atmosphere pushing down on a given unit of area.

9. Atmospheric Transparency
How transparent the atmosphere is to insolation; how easily can insolation pass through the air.

10. Barometer
An instrument used to measure air pressure

11. Cloud Cover
The fraction or percent of the total sky at a location that is covered by clouds.

12. Cold Front
The interface of an advancing cold air mass and a warmer air mass. 

13. Cyclone
A low-pressure portion of the troposphere that has air moving towards its center. Rotates counterclockwise. Includes: hurricanes & tornadoes, also called a low.

14. Cyclonic storm
A large type of low-pressure storm system formed in the mid-latitudes.

15. Dew Point
The temperature at which the air becomes saturated with water vapor and the relative humidity is 100%

16. Front
The interface between two air masses of different characteristics.

17. Humidity
The water vapor in the atmosphere

18. Isobar
An isoline used on weather and climate maps that connect points of equal air pressure.

19. Jet Stream
A concentrated curving band of high speed, easterly moving winds usually at the top of Earth’s troposphere.

20. Monsoon
Cyclic and extreme weather changes caused by the shifting wind and pressure belts. Common in southwest Asia

21. Occluded front
The boundary of opposing wedges of cold air masses formed when a cold front overtakes a warm front, lifting the warm air mass of Earth’s surface, forming mid-latitude cyclones

22. Planetary wind belt
East-west zones on Earth where the wind blows from one direction much of the time. AKA prevailing winds.

23. Polar Front
An ever-changing boundary between the colder air masses toward the poles and the warmer air masses toward the middle latitudes.

24. Precipitation
Falling liquid or solid water from clouds toward Earth’s surface.

25. Probability
The chance of some environmental event, such as rain or an earthquake occurring.

26. Psychromotor
An instrument that is used to indirectly measure the amount of water vapor in the air, such as a sling psychrometer

27. Radar
An instrument that uses radio/microwave electromagnetic radiation to observe many weather features such as precipitation, tornadoes, and hurricanes

28. Relative humidity
The ratio of the amount of water vapor in the air to the maximum amount it can hold

29. Stationary Front
A weather condition in which the boundary between two air masses remains in the same position

30. Station Model
Cities and other weather station sites on weather maps represented by circles, with symbols in and around each circle that indicate the many weather variables.

31. Troposphere
The part of the atmosphere immediately above Erath’s surface; where most weather changes occur.

32. Visibility
The farthest distance at which one can see a prominent object at Earth’s surface with the naked eye; decreased by fog, air pollution, and precipitation.

33. Warm Front
The boundary of an advancing warm air mass and a retreating wedge of a cooler air mass; characterized by a gentle slope, long periods of precipitation, and strato (layered) clouds.

34. Water Vapor
Gaseous water in the atmosphere; also called moisture or steam.

35. Weather Variables
Condition of the atmosphere such as temperature, air pressure, wind, moisture conditions, cloud cover, precipitation, and storms.