24.5 weather patterns pg 765-771

How do air masses form?
A large body of air becomes stationary over a region of Earth’s surface. Or air moves over a ocean

What are the four types of fronts?
cold fronts, warm fronts, stationary fronts,occluded fronts

What types of weather are associated with cyclones and anticyclones?
cyclones are clouds, precipitation, and stormy weather
anticyclones are clear skies, very little precipitation, and calm conditions

How do thunderstorms and tornadoes form?
thunderstorms form when colums of air rise within a cumulonimbus cloud
tornados form when verical cylinder of ratatind air develops in a thunderstorm

air mass
A huge body of air that has similar temperature, humidity, and air pressure at any given height

front
a sharply defined boundary that forms when two unlike air masses meet

cold front
A front where cold air moves in under a warm air mass.

warm front
when warm air mass overtakes a cold air mass

stationary front
A boundary between air masses that don’t move possibly causing rain for several days

occluded front
forms when a warm air mass is caught between two cooler air masses

cyclone
A swirling center of low air pressure

anticyclone
A swirling center of high air pressure

thunderstorm
A small storm often accompanied by heavy precipitation and frequent thunder and lightning

lightning
a sudden electrical discharge in the atmosphere

thunder
a booming or crashing noise caused by air expanding along the path of a bolt of lightning

tornado
small and intense windstorm that takes the form of a rotating column of air that touches the ground

hurricane
a large tropical cyclone with winds of a least 119 kilometers per hour

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