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Chapter 2 (4-6)

Chapter 2 Lesson 4-6

TermDefinition
Air mass- A huge body of air that has similar temperature, humidity, and air pressure at any given height.
Tropical- A warm air mass that forms in the tropics and has low air pressure.
Polar- A cold air mass that forms north latitude or south of 50 degrees south latitude and has high pressure.
Maritime – A humid air mass that forms over oceans.
Continental- A dry air mass that forms over land.
Jet stream- Bands of high speed winds about 10 kilometers above Earth’s surface.
Front- The boundary where unlike air masses meet but do not mix.
Occluded- Cut off, as in a front where a warm air mass is caught between two cooler air masses.
Cyclone- A swirling center of low air pressure.
Anticyclone- A high-pressure center of dry air.
Storm- A violent disturbance in the atmosphere.
Thunderstorm- A small storm often accompanied by heavy precipitation and frequent thunder and lightning.
Lightning- A sudden spark, or energy discharge, caused when electrical charges jump between parts of a cloud, between nearby clouds, or between a cloud and the ground.
Hurricane- A tropical storm that has winds of about 119 kilometers per hour or higher.
Storm Surge- A “dome” of weather that sweeps across the coast where a hurricane lands.
Tornado- A rapidly spinning column of air that reaches down and touches Earth’s surface.
Evacuate- Moving away temporarily from an area about to be affected by severe weather.
Meteorologist- Scientists who study the causes of weather and try to predict it.
Isobar- A line on a weather map that joins places that have the same air pressure.
Isotherm- A line on a weather map that joins places that have the same temperature.
Created by: rowlandm
 

 



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