Air Pressure and Wind
1. wind


Air that moves horizontally and just over the
ground.
The flow of air
2. convection cell
A part of the atmosphere where air moves
in a circular pattern because of unequal
heating and cooling.
 Also, it is a pattern of air rising, sinking,
and blowing horizontally

=
3. sea breeze

A wind that blows from the sea to the land
4. land breeze

Air blown from land toward the water.
5. Coriolis effect
Makes the wind curve to the right in the
Northern Hemisphere
 Causes winds to blow to curve to the left
in the Southern Hemisphere.

6. Winds that effect the United States.
prevailing westerlies
United States is here
West
East
California to North Carolina




these winds blow from the west to the east
they effect the United States and us (North Carolinians)
effects places located between 30 N and 60 N (latitude
and longitude of the United States)
Why are they important?
 they carry the warm, waters and winds to the western
coasts of continents
 very variable (changing) and produce stormy weather
7. What can get in the way of the
prevailing westerlies?
 Mountains
 Cities/buildings
 Trees/forests
Which way do you think prevailing easterlies blow?
8. isobar

A line on a map connecting places with
equal air pressure
9. air pressure
As elevation increases, air pressure
decreases.
 As you get higher in altitude, air pressure
decreases.

10. updraft

Air that rises
Review: humidity


Amount of moisture in the air
Relative humidity is a comparison between how
much water vapor is in the air and how much
the air can hold.

When temperatures vary from location to location, which
weather condition plays a role in creating winds when it also
changes?
A) humidity
B) air pressure
C) cloud over
D) precipitation

What causes differences in air pressure?
A) clouds
B) lightning
C) pollution
D) temperature
A student observes the changes in the pressure and
temperature in a region, as shown in the table.
Time
Pressure
(millibar)
Temperatur
e (F)
9 a.m.
996
87
10 a.m.
992
88
11 a.m.
990
89
12 p.m.
985
92
What is the most appropriate prediction about the approaching
weather for this region?
A) calm
B) cold
C) fair
D) stormy
The diagram represents the atmospheric conditions at a certain
location.
Up
Left
Right
Down
Cold Air
High Pressure
Warm Air
Low Pressure
X
In which direction will the wind most likely blow from point X?
A) down
B) left
C) right
D) up