1. L.O: AIR MASSES AND FRONTS

2. AN AIR MASS IS A HUGE BODY OF
AIR HAVING CHARACTERISTICS LIKE
TEMPERATURE AND MOISTURE.

3. AIR MASSES GET THEIR
CHARACTERISTICS FROM WHERE THEY
COME FROM.
• mT: MARINE TROPICAL IS WET AND WARM.
• mP: MARINE POLAR IS WET AND COLD.
• cT: CONTINENTAL TROPICAL IS DRY AND
WARM.
• cP: CONTINENTAL POLAR IS DRY AND COLD.
• cA: CONTINENTAL ARTIC IS DRY AND VERY
VERY COLD.

5. FRONTS:

6. FRONTS are the boundary between
two air masses.
It always rains at the frontal
boundaries.

7. Warm front brings warm air mass that
replaces a cold.

8. cold front brings cold air mass that
replaces a warm

9. stationary front: cold air mass up
against a warm air mass.

10. stationary front: cold air mass up
against a warm air mass.

11. occluded front: a warm air mass
trapped between two cold.

12. Low pressure
systems versus
high pressure
systems:

13. Low pressure systems: winds flow
counter-clockwise and in. bad weather

15. high pressure systems: winds flow
clockwise and out. good weather

16. NOW DO QUESTIONS ON PAGE
150.

17. Station models and weather
forecasting.
Please complete page 150- 155

18. Selected properties of the
atmosphere:
Please complete page 161- 165