- List the scales of atmospheric motion categorized according to size and
lifespan, and give examples of each.
- Describe how sea and land breezes are produced.
- Describe how mountain and valley breezes are produced.
- Give examples of other local wind systems.
- Describe the idealized pattern of global circulation as proposed by George
- Describe the idealized three-cell model of global circulation.
- Describe a jet stream and discuss how the U.S. weather is influenced by
the position of the jet stream.
- Describe the relationship between the Southern Oscillation and a major El
Nino event. Discuss how recent El Nino events have adversely affected U.S.
Scales of Atmospheric Motion
- categorized according to average size and lifespan
- macroscale (planetary scale) - longwaves in the westerlies
- synoptic scale (weather map scale) - cyclones, anticyclones
- mesoscale - thunderstorms, tornadoes, land and sea breeze
- microscale - turbulence, wind gust
Local Wind Systems
- katabatic winds
- chinook winds
- Santa Ana winds
- dust devils
- Texas norther
- knowledge from observed pressure, wind and theory of fluid motion
- Hadley one cell model
- three cell model
Three Cell Model (a)
Three Cell Model (b)
- Global circulation in the middle latitudes
- Westerlies produce a general west to east movement of weather systems in
the middle latitudes
- narrow ribbons of high speed winds
- middle latitudes, 25,000 - 40,000 ft., 60 - 300 mi. wide, 120 - 240 mph
El Nino and the Southern
1. Describe the various scales of motion, and give an example of each.
Explain how thermal circulation develops.
4. Why does a sea breeze blow from
sea to land and a land breeze from land to sea?
6. You are fly fishing in a
mountain stream during the early morning. Would you expect the wind to be
blowing upstream or downstream? Explain.
7. Which wind will most likely
produce clouds: a valley breeze or a mountain breeze? Why?
12. Draw a large
circle. Now, place the major surface pressure and wind belts of the world at the
13. According to Fig. 7.14 (p.173), most of the United
States is located in what wind belt?