Local and Global
Here's a link named Weather Wiz Kids. It has more facts about weather information.
- The jet stream is a fast flowing, river of air.
- It is found in the atmosphere at around 12km above the surface of the Earth just under the tropopause.
- They form at the boundaries of adjacent air masses with significance differences such in temperature.
- Wind is created when two different air masses meet.
- Wind is air in motion.
- There are two factor necessary to specify wind:speed and direction
Global Wind Patterns
- At the equator, air is heated and rises, leaving low pressure areas behind.
- Moving to about 30 degrees north and south of the equator, the warm air from the equators begins to cool and sink.
- Most of the cooling sinking air moves back to the equator,
- The rest moves towards the poles
- Between 30 and 60 degrees latitude, the winds that move to the poles appear to curve to the east.
- Prevailing Westerlies in the Northern Hemisphere are responsible for many of the weather movements across the United States and Canada.
- A differential heating of land and sea leads to the development of local winds called sea breezes.
- When air above the land surface is heated by radiation from the Sun, it expands and begins to rise, being lighter than the surrounding air.
- To replace the rising air, cooler air is drawn in from above the surface of the sea.
- A land breeze occurs at night when the land cools faster than the sea.
- it is air above the warmer surface water that is heated and rises, pulling in air from the cooler land surface.