WEATHER PATTERNSWEATHER PATTERNS

VOCABULARYVOCABULARYWeatheWeather- the temperature, humidity, r- the temperature, humidity,

precipitation, and wind at a particular place precipitation, and wind at a particular place and time.and time.

Air massAir mass- a large area of air that has the - a large area of air that has the same temperature and amount of water same temperature and amount of water (humidity.)(humidity.)

ColdCold frontfront- a place where cold air pushes - a place where cold air pushes warm air up.warm air up.

Warm frontWarm front- a place where warm air - a place where warm air moves over cold air.moves over cold air.

HOW WEATHER HOW WEATHER CHANGESCHANGES

An air mass is a big area of air that An air mass is a big area of air that has the same temperature and has the same temperature and humidity. An air mass can be warm humidity. An air mass can be warm or cold. Sometimes cold air masses or cold. Sometimes cold air masses meet warm air masses.meet warm air masses.

The places where air masses meet The places where air masses meet are called are called frontsfronts. Weather changes . Weather changes along fronts.along fronts.

COLD FRONTCOLD FRONTA cold front A cold front

ALWAYS brings ALWAYS brings tall clouds with tall clouds with moderatemoderate to to heavy rain along heavy rain along with moderate to with moderate to severe wind. severe wind.

COLD FRONTCOLD FRONT

COLD FRONTCOLD FRONT

COLD FRONTCOLD FRONT

COLD FRONTCOLD FRONT

COLD FRONTCOLD FRONT

COLD FRONTCOLD FRONT

WARM FRONTWARM FRONT A warm front happens A warm front happens

when warm air blows when warm air blows into cold air. The into cold air. The warm air moves up warm air moves up slowly over the cold slowly over the cold air.air.

Water Water condensescondenses into into a long line of clouds. a long line of clouds. The rain that follows is The rain that follows is a gentle rain with soft a gentle rain with soft winds.winds.

WARM FRONTWARM FRONT

WARM FRONTWARM FRONT

WARM FRONTWARM FRONT

WARM FRONTWARM FRONT

WARM FRONTWARM FRONT