Give an example of each scale of atmospheric motion; Micro, Mess and Macro. An example of a “Microscope” atmospheric motion would be a small, turbulent breeze blowing through the trees. A IF tornado flowing across a Kansas corn field would be an example of a “Mescals” motion, and Super Storm Sandy would be a great example of a “Microscope” motion. What causes an “eddy” to form? An “eddy is formed when wind encounters a solid object, a whirl of air is formed on the object’s downward side. The size and shape of the eddy depends on the speed of the wind, ND the size/shape of the obstacle.

Explain what causes the “sea breeze” and “land Breeze”. A “sea breeze” forms during the day as the land heats more quickly than the near by water which creates a shallow thermal low (warm air rising over land). The air remains cool over the water, which creates a shallow thermal high. (cool air sinking). The high pressure moves toward the low pressure and creates a wind that blows from the water to the land. The opposite occurs during land breeze. At night, the land cools faster than the water that has absorbed heat from the sun all day.

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The shallow thermal high forms over land while the shallow thermal low forms over the water. Again, the high pressure flows toward the low which results In a land breeze flowing from land out to sea. Explain what causes the “monsoon rain season”. The summer season in southeast Asia experiences “monsoon rain seasons”. This occurs when a shallow thermal low develops over Sais’s continental Interior, and the air within the low rises and begins to flow counter-clockwise. This motion results In moisture-bearing winds sweeping Into land from the ocean.

The humid air converges tit dryer air from the continent, which has an additional lifting effect and brings the air to its saturation point. Heavy rains and thunderstorms result. Explain what causes “valley breezes” and “Mountain breezes”. During the day, sunlight warms the valley walls, which also warms the alarm making contact with them. The heated alarm rises as a gentle “upslope” wind which Is called a valley breeze. The reverse happens at night. The slopes cool very quickly causing the alarm to sink down the slope and Into the valley, which provides a mountain breeze. Explain what causes “Chinook Winds”.

Chinook winds are warm, dry, downslide winds that occur when strong westerly winds aloft flow over a north-south-trending mountain range. These conditions can produce a trough of low pressure on the mountain’s eastern side. As the alarm descends, In compresses and warms which can cause sharp rises In temperature. Explain what causes the “Santa Ana Winds”. Santa Ana winds form as alarm descends from the elevated desert plateau and funnels through the mountain canyons of San Gabriel and San Bernardino Mountains. These winds spread over the Los Angels Basin and San Fernando Valley to the Pacific Ocean.

These winds can reach speeds of 90 knots! Using Figure 7. 27 on page 198 of your book list the pressure systems In January and July. The January period shows low pressure systems that hug the Earth’s equator while high pressure systems are very close to 30 degrees latitudes. The July period shows the low pressure systems migrating toward the 30 degrees north latitude and Interacting with the high pressure systems. This would explain our wetter summer months versus ten dryer months ruling winter does up-welling affect the climate of San Francisco? . Extra Cree