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Science Chapter 17

Air Mass a huge body of air that has similar temperature, humidity, and air pressure at any given height
Maritime Tropical warm, humid air masses form over the Gulf of Mexico and Atlantic oceans
Maritime Polar cool, humid air masses form over the icy cold North Pacific and North Atlantic oceans
Continental Tropical hot, dry air masses form mostly in summer over dry areas of the Southwest and northern Mexico
Continental Polar form over central and northern Canada and Alaska, bring bitterly cold weather with very low humidity
Cold Fronts rapidly moving cold air mass overtakes a slow-moving warm air mass
Warm Fronts a fast moving warm air mass overtakes a slower moving cold air mass
Stationary Fronts a warm air mass and a cold air mass meet and neither can move the other; may bring many days of precipitation
Occluded Fronts a warm air mass is caught between to cold air masses
Low Pressure Systems associated with clouds, wind, and precipitation; are marked with an L
High Pressure Systems generally causes dry, clear weather; marked with an H
Storm violent disturbance in the atmosphere
Thunderstorms a small storm often accompanied by heavy precipitation, strong winds and frequent thunder and lightning, forms in large cumulonimbus clouds
Flash Floods sudden violent flood that occurs shortly after a storm
Tornadoes rapidly whirling, funnel-shaped cloud that reaches down from a storm cloud to touch the Earth’s surface, can last for 15 minutes or less, and can reach speeds of 500 kilometers and hour
Hurricanes tropical cyclone that forms over warm ocean water, is long lasting, and has winds of 119 kilometers (75 mph) or higher
1st Stage of a Hurricane Tropical wave
2nd Stage of a Hurricane Tropical disturbance
3rd Stage of a Hurricane Tropical depression
4th Stage of a Hurricane Tropical storm
5th Stage of a Hurricane Hurricane
Storm Surge a dome of water that sweeps across the coast where the hurricane lands causing great damage
Hurricane Warning hurricane conditions are expected within the next 24 hours and people should begin evacuation
Winter Storm most dangerous aspect is often the wind
Lake-Snow Effects cold, dry air blows over large lakes then over land
Meteorologist scientist who study the weather and try to predict it. They use maps, charts, and computers to analyze weather data and to prepare forecast
Isobars lines on a map joining places to show high and low pressure systems
Isotherms line joining and varying colors to show places that have the same temperature
Created by: s730066