COMMON ATMOSPHERIC
PHENOMENA
Why the wind blows?
Why monsoons occur?
What is the so-called Intertropical
Convergence Zone?
What happens
when air is heated?
What Makes the Air
Move?
WINDS
- Are air that is moving horizontally.
- Are caused by differences in air
pressure.
 AIR MOVES TOWARD THE PLACE
WHERE WARM AIR IS RISING.
LOCAL WIND
--a wind that blows over a short distance.
--caused by the UNEQUAL heating of
Earth’s surface within a small region.
Example: Sea breeze
Land breeze
Which warms up
faster?
Land or Water?
SEA BREEZE
During the day, the land heats up faster
than the water in the sea.
LAND BREEZE
During the night, the land and sea will
both cool down. But the land will lose
heat faster than the water in the sea.
GLOBAL WIND
--Winds that blow over long distances from a
specific direction.
--caused by the UNEQUAL heating of Earth’s
surface across a large region.
Examples: Trade winds
Westerlies
Polar Easterlies
GLOBAL WIND
1. TRADE WINDS
--are wind belts just north and south of the equator.
In the Northern Hemisphere, they blow from
northeast to the southwest.
2. WESTERLIES
--the prevailing westerlies occur between 30º and 60º
latitude in both hemisphere. These winds generally
blow from west to east over much of North America.
3. POLAR EATERLIES
--extend from 60º latitude to the poles in both
hemispheres.
Why monsoons
occur?
MONSOON
--is wind system that is characterized by
seasonal reversal of direction.
MONSOON
1. AMIHAN (Northeast Monsoon)
--comes from northeast and moves
toward the south.
2. HABAGAT (Southwest Monsoon)
--comes from southwest and moves
toward the north.
What is the so-called
Intertropical Convergence
Zone (ITCZ)?
Intertropical Convergence Zone
(ITCZ)
Intertropical Convergence Zone
(ITCZ)
--is the place where winds in the tropics
meet or converge.
Intertropical Convergence Zone
(ITCZ)
In the time rising warm air will form
clouds, which may lead to thunderstorms.
THANK YOU! 