1. Weather

2. Atmospheric Movement
 Global air
circulation
patterns within
the atmosphere
held to Earth by
gravity and
warmed as heat
radiates from
Earth

3. Coriolis Effect
 The apparent
defection of
moving air, as
seen by an
observer on
Earth; apparent
defection is a
result of Earth's
rotation

4. Air Pressure
The force exerted on Earth’s
surface by the weight of the air
above the surface
Air pressure is greatest at sea
level and lessens with increased
distance from Earth’s surface.

6. Wind
 A natural movement of air sometimes
with considerable force from an area of
high density and pressure to an area of
low density and pressure

7. Air Masses
An air mass is a body of air
extending over a large area
(1,000 miles or more) that
develops and retains specific
characteristics of pressure,
temperature and humidity

8.  An air mass forming over a hot desert
would be dry and hot.
 One forming over a cold marine surface
would be cold and humid.

10. High-Pressure Air Mass
 An air mass with
greater
atmospheric
pressure than the
surrounding air
masses; air moves
away from the high
pressure, traveling
in a clockwise
direction

11. High-Pressure Air Mass
 HIGHS are denser, cooler and dryer than
the adjacent air. The air is descending
toward Earth’s surface.
 HIGHS bring pleasant weather conditions in
the summer and very cold clear weather in
the winter.

12. Low-Pressure Air Masses
 An air mass with less
atmospheric pressure
than the surrounding
air masses; air moves
towards the low
pressure, traveling in
a counterclockwise
direction
 Lows bring stormy
weather.

14. Warm Front
 Forms at the surface of Earth when
a warm, moist air mass overtakes a
cool, dense and dryer air mass
 Slow moving and are characterized
by a series of clouds getting lower
and thicker as the front
approaches.

15. Warm Front

16. Cold Front
 Forms at the surface of Earth when
a cold, dry air mass overtakes a
warmer, humid air mass
 Cold fronts are characterized by
dramatic storms, thunder, lightning
and sometimes tornadoes.

17. Cold Front

18. Hurricane
 A large, tropical
weather system
consisting of an
extreme low pressure
air mass with heavy
rains and wind speeds
of at least 119km/h
 Needs warm water to
develop and stay
strong