Take out H.W. (“L” portion of KWL) Goal: Explain the causes of local wind patterns & compare/contrast land & sea breezes. DO NOW Update T.O.C. Take out H.W. (“L” portion of KWL) Update Agenda: HW: Mark-up handouts showing the day/night land/sea and mountain/valley breezes. Write a couple sentences about each explaining what is happening over the land and water during day & night time. You must reference temperature changes, air pressure changes and direction of air movement. Update Vocab. In your notes copy the following Costa’s question: Would there be winds if the Earth’s surface was the same temperature everywhere? Explain. Review student responses to the question as the A.S.

Local Winds Local winds move short distances and can flow from any direction. Geographic features (natural barriers) can produce temperature differences (Remember – Temperature difference cause pressure differences!) that cause local winds. Shoreline – Change from land to sea Mountain range – Change in elevation

Watch This! Land/Sea Breeze Animation

Valley Breeze – Warm air moves up the slope of the mountain Mountain Breeze – Cool air moves down the slope of the mountain During the day, the surface of the mountain heats the air high up in the atmosphere, quicker than the valley floor can. As the warmer air expands a low pressure is created near the top of the mountain. This attracts the air from the valley, creating a breeze that blows from the valley floor up towards the top of the mountain. Often birds known as raptors, such as eagles, hawks, condors and vultures, float on these breezes to preserve their energy. This wind pattern is known as a valley breeze. In the evening, the mountain slopes cool the surrounding air more quickly than the air found lower in the atmosphere. This creates a high pressure as air becomes more densely packed. The resulting high pressure causes winds to blow down the mountain towards the valley floor. This type of wind pattern is known as a mountain breeze. So, in the daytime we typically see valley breezes as winds blow from the valley up towards the mountains. In the night we often see mountain breezes as winds travel from the mountains down towards the valleys.

Work on your own Use the Venn Diagram to compare and contrast similarities & differences between a Land Breeze and a Sea Breeze Refer to your notes to complete

Sea Breeze Land Breeze Same