1. Starter
Puzzle in the Air The jumble of words below makes no sense. But if you put the words in order, they reveal something about the atmosphere and its relationship to the earth. Write the message- a compound sentence- in your notebook. in changed earth’s has changes atmosphere life affect conditions Life and the for atmosphere

2. Starter Bring on the Weather
Weather is what we call the day-to-day changes in wind, temperature, humidity, and air pressure.
In the puzzle below, empty spaces follow some of the letters in the word WEATHER. Fill in the spaces with weather-related words that start with that letter.
W. Wind, water
H. humidity E. A. R.
T. temperature

3. Starter
Prepare for your quiz on weather.

4. Starter Quiz Which layer of the atmosphere do we live in?
Which 2 major gases is the atmosphere composed of?
Why do planes fly in the stratosphere?
Where would a cP air mass originate?
What kind of weather is expected with a cold front?

5. Starter Answers Troposphere Nitrogen and Oxygen To avoid bad weather
Over continental land at the poles
Stormy weather; heavy rains.

6. Clouds Up Above
When air is cooled below its dew point, water vapor becomes liquid water. Condensation occurs, and clouds may appear. A cloud’s shape depends on the air moving around it.
Circle the two words next to each basic cloud type that best describe it.
Cumulus puffy icy thin cauliflower heavy
Stratus low billowy feathery layers spiky
Nimbus dry rain wispy snow windy flowery
Cirrus ice low drizzle high desert misty

7. Air Masses, Fronts

8. Air Density The amount of air contained in a specific volume
Factors that affect it:
Temperature-As temperature rises, air density drops
Air Pressure-Air density increases with increased pressure
Altitude-As altitude increases, air pressure decreases & density
Humidity-The more moisture in the air the lower the air density

9. Air Masses Where they originated: c- Land m-Water T- Equator P- Poles
A large body of air that takes on the characteristics of the area over which it forms
Continental Tropical (cT)
Maritime Tropical (mT)
Continental Polar (cP)
Maritime Polar (mP)
Arctic (A)

12. Air Masses
Air masses move when they encounter a pressure difference with a surrounding air mass
When air masses meet generally severe weather occurs (ex. Hurricanes & tornadoes)

13. Fronts
A front is a narrow region separating two air masses of different densities
Cold Front
Warm Front
Stationary Front
Occluded Front

14. Cold Front
In a cold front cold, dense air displaces warm air and forces the warm air up. As warm air rises it cools and condenses.
Clouds,heavy showers and violent thunderstorms are often associated with cold fronts.

15. Warm Front In a warm front warm air displaces cold air.
A warm front is characterized by extensive cloudiness and precipitation.

16. Stationary Front
In a stationary front two air masses meet and neither advances
There are rarely any clouds or heavy precipitation

17. Occluded Front
An occluded front occurs when a cold air mass moves so quickly that it overtakes a warm front.
The warm air is wedged upward
The air near the ground becomes cooler. The warm air cools and its moisture condenses forming clouds and rain or snow.

18. Wind Systems
Wind occurs due to a pressure/temperature difference between 2 air masses
There are 3 zones of winds systems in each hemisphere caused by the Coriolis Effect
Trade Winds (Located 0-30 N and S). Blows East-West
Prevailing Westerlies (Located N and S) Blows West-East
Polar Easterlies (Located N and S) Blows East-West)

21. The Coriolis Effect

23. Homework
On page 28 construct a Venn Diagram Comparing warm and cold fronts!!!!