Winds Difference in air pressure Horizontal movement of air High pressure moves to low pressure Unequal heating off air Warmer expands = less dense = less air pressure Cooler expands = more dense = higher air pressure What causes winds? What changes air pressure?

How is wind measured? What is the wind-chill factor? Direction – wind vane Named for where they come from. Ex. Blows south comes from north Measured with anemometer Wind turns cups Cooling effect from wind Stronger wind = cooler the feeling

What are local winds? Unequal heating of air in small area Often occurs where land is by large body of water.

Land Breeze – Nighttime Draw this picture then take notes Land cools faster than water – cools air above  cool air move out to sea pushes warm air up 2. Water stays warmer than land – air stays warmer  warm air rises

Sea Breeze – Daytime Draw this picture then take notes Water is warms slower than land – cooler air above  cool air moves towards land pushes warm air up. 2. Land warms faster than water – warm air rises  pushes warm air up

Just a different picture for you to look at!! NOTICE!! Sea Breeze Wind comes from the sea Land Breeze from the land

Other Local Winds Draw pictures then take notes Daytime Air warms  rises breeze up the mt. Nighttime Air cools  sinks breeze down the mountain

What is a monsoon? South and Southeast Asia A large Sea Breeze in the summer

Literacy Do Now: 3/21 1. Open a Science Text Book to page 758. Today ~ Read pages 754 out loud in class ~ Complete the Observation and Inference worksheet – will be collected today. When you finish the worksheet you may read quietly or work on homework. HW: I did not leave the quiz – it will be Monday so, study the scientific method, observation and inference definitions