1. Pressure and Wind
©Mark Place,

2. What instrument is used to measure:
wind speed
air pressure
Measured in Knots
Measured in millibars or inches of mercury
anemometer
barometer
[ORIGIN from Greek anemos ‘wind’]
[ORIGIN from Greek baros ‘weight’]

3. How are winds named? The direction from which they come Wind Vane
From the EAST
Which way is the wind moving??

4. What causes wind?
differences in
pressure

5. Which pressure gradient would result in greater wind velocity?
S K E T C H

6. measurements using the chart
Convert the following
measurements using the chart
on page 13 of the
ESRTs.
29.74
997
30.18
994

7. Wind blows from areas of
to areas of
high
pressure
low
pressure

8. Draw the relationship between air pressure and air density.

9. Warm air is LESS dense than cold air
Temp. and Density
Warm air is LESS dense than cold air
Density
Temperature

10. This is because the air is Therefore, clouds CANNOT form.
In a high pressure area,
air will (rise, sink)
because the air is
(less, more) dense.
This is because the air is
(cold, warm)
and (rises, sinks).
Therefore, clouds CANNOT form.

11. This is because the air is
In a low pressure area,
air will (rise, sink)
because the air is
(less, more) dense.
This is because the air is
(cold, warm)
and (rises, sinks).
Therefore, clouds are
LIKELY to form.

12. CYCLONE ANTICYCLONE Correctly draw the direction of wind flow
around both a high and a low pressure area
in the NORTHERN HEMISPHERE.
**Get the arrows correct**
CYCLONE
ANTICYCLONE

13. counterclockwise wind direction
low pressure
high pressure
warm or cold air
air rising or sinking
clouds or no clouds
clockwise or
counterclockwise wind direction
winds toward or
away from the center
warm
cold
rising
sinking
clouds
no clouds
counter clockwise
clockwise
toward
away

14. On the diagrams below, label which one represents a
land breeze and which represents a sea breeze.
Correctly label on each diagram where the
high and low pressure areas would be found.

15. Sea Breeze (daytime) H L
On the diagrams below, label which one represents a
land breeze and which represents a sea breeze.
Correctly label on each diagram where the
high and low pressure areas would be found.
Sea Breeze (daytime) H L

16. Land Breeze (night time) L H
On the diagrams below, label which one represents a
land breeze and which represents a sea breeze.
Correctly label on each diagram where the
high and low pressure areas would be found.
Land Breeze (night time) L H

17. What’s the relationship
between wind and waves?
direct
(the stronger the wind,
the bigger the waves)

18. 45°N 45°S 75°N 20°N southwest northwest northeast northeast
Using the chart on page 14, state the prevailing
wind direction for each latitude below:
45°N
45°S
75°N
20°N
southwest
northwest
northeast
northeast

19. Is air rising or sinking
at the equator?

20. Is air rising or sinking
at 30°N?