1. Winds Wind is caused by differences in air pressure.
The greater the difference the greater the wind speed.
Close Isobars= High Winds
Widely Spaced Isobars= Low Winds

2. The Coriolis Effect
The rotation of Earth causes a curving path of winds and ocean currents.
Northern Hemi – right
Southern Hemi – left

3. Global Winds Winds caused by uneven heating of Earth’s atmosphere.
Equator gets more sunlight…
This air expands, rises and flows toward poles
Polar air is denser so it flows toward the equator
Non-rotating Earth, 2 cells(North & South) ->

4. Because of Earth’s rotation, instead of 2 cells we have 6
Global Winds
Because of Earth’s rotation, instead of 2 cells we have 6
Winds are named by the direction from which they blow.

6. Global Winds Trade Winds: occurs at 30* north and south latitude
Around 30* latitude, air sinks causing high pressure = weaker winds
Near equator, air rises causing low pressure = stronger winds

7. Global Winds
Prevailing Westerlies: flows between 30* and 60* north and south latitude in a circulation pattern opposite that of the trade winds
Wind blows from the west to the east
Responsible for movement of weather across US

8. Global Winds Polar Easterlies: lies between 60* latitude and the poles
Cold air mass that blows toward the east

9. The Jet Stream: narrow bands of fast, high- altitude, westerly winds
Polar Jet stream = separates polar easterlies and prevailing westerlies
Subtropical jet stream = separates the trade winds and prevailing westerlies

10. Notes. The more the better!
Front
Symbol
Air Mass Diagram 
Weather
Notes. The more the better!

11. Types of Fronts – Cold Front
Cold fronts form when cold air moves under warm air and pushes the warm air up.
Cold fronts can bring thunderstorms, heavy rain, snow, and cooler temperatures
Cold fronts can move up to twice as fast as warm fronts

12. Types of Fronts – Warm Front
Warm fronts form where warm air moves over cold air
The warm air gradually replaces the cold air
Brings clouds and drizzly rain

13. Types of Fronts – Stationary Front
Stationary fronts form when both air masses have similar densities
Can bring rain and cloudy weather that lasts for days

14. Types of Fronts – Occluded Front
Occluded fronts form when a fast moving cold front catches up to a warm front
Brings cool temperatures and large amounts of rain and snow

15. Pressure Systems

16. Counter-Clockwise spin
High and Low Pressure
Areas of Low pressure are characterized by:
Hot Air Rising
This leads to clouds and precipitation
Low Pressure = Cyclone
Counter-Clockwise spin

17. High and Low Pressure Areas of High pressure are characterized by:
Cold Air Sinking
winds blowing away in clockwise motion
High Pressure = Anti-cyclone