1. Weather Notes Part 3

2. How Winds Form

3. What causes wind?
When warm air rises and cooler air moves in to replace it. OR
When an area of high pressure replaces an area of low pressure

4. How are winds named? By the direction they blow FROM
For example Polar Easterlies come from the east; A northerly wind comes from the north…
Winds blowing from the East
Winds blowing from the West

5. Air begins to cool because of altitude
Cool air is more
dense and sinks
Warm air over
water rises
Cool air from land
replaces risen air
Land Breeze

6. Sea Breeze Air begins to cool because of altitude Warm air rises
Cool air is more
dense and sinks
Sun heats air near ground
Cool air from sea
replaces risen air
Sea Breeze

7. GLOBAL WINDS
A wind that covers a large area and blows in a specific direction.

8. Describe the major global wind belts .
Trade winds are caused as the warm air near the equator rises and cool air moves into replace it. They are easterly winds.
Westerlies are created by sinking air moving toward the poles. They are southwest winds.
Polar Easterlies are created at the poles by sinking cold air. They come from an easterly direction

9. What is the Coriolis effect?
The apparent deflection of winds due to the Earth’s rotation
Objects in the Northern Hemisphere are deflected to the right of their initial direction.
Objects in the Southern Hemisphere are deflected to the left.

10. MEASURING WINDS Anemometer- measures wind speed
Wind Vane- measures wind direction