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Weather Patterns 5th
| Term | Definition |
|---|---|
| current | a flow of air or water in a certain direction |
| jet stream | an air current in the upper atmosphere that flows from west to east |
| Gulf Stream | a warm ocean current in the Atlantic Ocean |
| El Nino | an unusual warming of surface water in the eastern Pacific Ocean near the equator |
| La Nina | an unusual cooling of surface water in the eastern Pacific Ocean near the equator |
| land breeze | the movement of air created by cool air over land moving toward the ocean |
| sea breeze | the movement of air caused by cool air over the ocean moving toward the land |
| valley breeze | the movement of air created by warm air rising and flowing up the slope of a mountain |
| mountain breeze | the movement of air caused by cool air sinking and moving down the slope of the mountain |
| front | a place where two different air masses meet |
| global winds | winds throughout the globe |
| local winds | winds in a specific area |
| occluded front | the area in which a warm air mass is caught between two cold air masses; brings cool temperatures and plenty of rain and snow |
| stationary front | a place where two air masses meet and stop moving |
| cold front | a place where a cold air mass bumps up against a warm air mass |
| warm front | a place where a warm air mass meets a colder air mass and slowly rises over it |
| air mass | a large body of air with about the same temperature and humidity throughout |
| air pressure | the weight of the atmosphere pressing at a certain place |
| humidity | the amount of water vapor in the air |
| polar easterlies | move east to west in the polar regions |
| westerlies | winds that blow from the west |
| trade winds | winds that blow east to west towards the equator; caused by hot air rising at the equator with cool air moving in |