1. Temperature Conversion
You may need to use this
Chart to complete your
Station model

2. Mapping a Temperature Field
Page 8
Isotherms-
Station model
Lines connecting points of equal temperature 43
Station model
Temperature
(always in ºF)

3. Page 8

4. QUESTIONS SE, ISOTHERMS 50°F
Page 8
SE, ISOTHERMS
50°F
LOWER LATITUDES WARMER TEMPERATURES b/c higher angle of insolation
0.029°F/ km
0.012°F/ km

5. Mapping a Pressure Field
Page 9
Mapping a Pressure Field
Isobars- __________________________________________________________________
Isolines that connect points of equal pressure on a weather map

6. QUESTIONS
Page 9

7. QUESTIONS ??? 0.013 mb/ km 0.003 mb/ km Construct a station model
Page 9
???
0.013 mb/ km
0.003 mb/ km
Construct a station model

8. Crushing Cans Air Pressure Observe the demonstration
Page 10
Air Pressure
Observe the demonstration
What is happening?
Why? Describe it in terms of high and low pressure 8

9. Pressure and Wind What is the cause of air pressure?
Page 10
What is the cause of air pressure?
________________________________
The weight of the Earth’s atmosphere 9

10. Pressure and Wind Page 10 REVIEW
What instrument is used to measure wind Speed?
What instrument is used to measure air pressure?
Barometer Anemometer 10

11. Page 10
Normal air sea level is millibars or inches of mercury

12. Let’s do some pressure conversions
Millibars (mb)
Inches of Mercury
1030.0
29.95
29.41
1000.0
28.62
30.42
1014.0
996.0
29.53
969.1
Page 10

13. What is wind caused by?
Page 10
Pressure differences due to the Unequal heating of Earth’s surface
________________________________________________________________________
Examples:
Land vs. Water
Poles vs. Equator
Dark Forest vs. Snow Field
__________________________________________________
Winds distribute regions of high pressure to low pressure

14. Pressure and Wind What instrument is used to measure wind Speed?
Page 10
What instrument is used to measure wind Speed?
Anemometer 14

15. Winds are named for the direction ________________________________
Caused by differences in air pressure (horizontal movement of air parallel to Earth’s surface)
Page 10
Wind-
Winds are named for the direction ________________________________
Example:
a. Wind from southwest= ________________________
b. Breeze blowing onshore from sea= _____________
of origin or where they come from
south westerly wind
Sea breeze

16. Winds Winds blow from areas of high pressure to areas of low pressure
Page 10
Winds blow from areas of high pressure to areas of low pressure

17. Wind Direction
Due to the Earth’s _______________ we experience the _____________________.
In the Northern Hemisphere winds are deflected to the _________________
In the Southern Hemisphere winds are deflected to the _________________
Page 10
ROTATION
CORIOLIS EFFECT
RIGHT
LEFT

18. Consequences of Rotation: the Coriolis effect
Page 10

19. CLOSE ISOBARS= STRONG WINDS
A measurement of the change in air pressure over a distance is called pressure gradient.
If the gradient is large, air will move faster to try and balance the difference. (This makes the wind blow harder)
CLOSE ISOBARS= STRONG WINDS
Isobars-
Page 10
Lines connecting points of equal air pressure

20. Example of Isobars on a Weather Map
Page 10
Example of Isobars on a Weather Map B C
Where will the winds be the Strongest? Weakest ?

21. Pressure and Density Decrease with ALTITUDE