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Wind and Weather.

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Presentation transcript:

Add to table of contents: Tornado scale Pg. 64 Air pressure & wind Pg. 65

Air Pressure & Wind Air pressure - The push of air molecules on a surface or object. Air with a high density=greater air pressure. Air with less density= less air pressure. When air heats up it expands and has less air pressure and density. When air cools down, it contracts and has a greater density and air pressure.

Hot Air rises = low air pressure Cold Air sinks = high air pressure

Wind - Movement of air Cause - horizontal differences in air pressure. Air flows from areas of higher pressure to areas of lower pressure. The unequal heating of Earth’s surface generates pressure differences. Solar radiation causes the unequal heating.

Highs and Lows Cyclones are centers of low pressure. Anticyclones are centers of high pressure.

Label the picture

LOCAL WINDS Land and Sea Breezes At night the reverse takes place. The land surface is heated more intensely during the daylight hours than an adjacent body of water is heated. As a result, the air above the land surface heats, expands, and rises, creating an area of lower pressure. At night the reverse takes place.

according to the direction NOTE: Winds are named according to the direction they are coming from

GLOBAL WINDS Air heats up at the equator and rises. It moves towards the poles and cools down and sinks. This creates convection currents that we call global winds.

Coriolis Effect The Coriolis effect describes how Earth’s rotation affects moving objects. In the Northern Hemisphere, all free-moving objects or fluids, including the wind, are deflected to the right of their path of motion. In the Southern Hemisphere, they are deflected to the left.

Video clip https://www.youtube.com/watch?v=mPsLanVS1Q8

Answer the essential question Work on Review sheet for test next class.

Review Tell whether the following are examples of conduction, convection or radiation: The heat from a furnace heating the room. You put a spoon in hot chocolate and it gets hot The heat from the sun warms the earth. You feel the heat of hot pavement through the bottoms of your flip flops.