1. CH. 15-3
Air Movement

2. Forming Wind
 Wind – the movement of air
from an area of higher
pressure to an area of lower
pressure.
 Air pressure is lower where
air is warmer.

3. Coriolis Effect
 The rotation of the Earth that
causes moving air and water
to appear to turn to the right
in the northern hemisphere &
to the left in the southern
hemisphere.

4. Global Winds
 Trade winds – winds created
by air descending to Earth’s
surface between the equator
and 30° latitude.
 Westerlies – winds formed
between 30° & 60° latitude
that move weather systems in
the US.

6. Winds in Troposphere
 Jet streams – narrow belts
of strong wind that blow
near the top of the
troposphere from west to
east.
 Helps move storms across
the country

9. Winds in Troposphere
 When flying eastward, jets
save time & fuel.
 When flying westward,
planes fly at different
altitudes to avoid jet
streams.

10. Sea Breezes
 Movement of air from sea
to land during the day.
 Cooler air from above the
water moves over land,
forcing the warm, less
dense air above land to
rise.

13. Land Breezes
 The movement of air toward
the water from land at night.
 At night, land cools faster
than ocean water.
 Air over land becomes cooler
& moves over the ocean
water.