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Science EQ: What causes weather? Do Now: 3-19. LG: Identify the air masses that create weather in the US. Describe the 4 types of weather fronts and the weather associated with each. HW: Study for test on Thursday

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Science eq what causes weather do now 3 19
Science EQ: What causes weather?Do Now: 3-19

LG: Identify the air masses that create weather in the US. Describe the 4 types of weather fronts and the weather associated with each.

HW: Study for test on Thursday

1. Air Mass chart notes – homework – stack or blue card if not completed

2. Take out Power Point Notes: Air Masses and Fronts

Today

~ complete VO: Air Masses

~ power point/notes: Air Masses and Fronts



Air mass video clip
 Air Mass VIDEO Clip 


Air masses
Air Masses

  • Air masses have the same properties as the surface over which it develops:

    maritime= Wet

    continental= Dry

    polar = Cold

    tropical = Warm

mP = wet/cold

cP = dry/cold

mT = wet/warm

cT = dry/warm



Fronts

WARM AIR

FRONT

COLD AIR

Fronts

A front is the boundary where two air masses meet.

Types of fronts:

  • Cold Front

  • Warm Front

  • Occluded Front

  • Stationary Front

Warm Air

Cold Air



Cold front
Cold Front

  • Cold dense air pushes under a warm air mass.

  • The cold dense air moves faster and causes the warm air rises quickly.

  • Narrow bands of violent storms form.


Why do cold fronts bring heavy rain and storms
Why do cold fronts bring heavy rain and storms?

  • Cold air interacting with warm air

    sudden drop in temperature

  • Condensation occurs quickly

     difference in pressure

  • Creates cumulonimbus clouds

  • Thunderstorms, heavy precipitation

  • Cold dense fast moving air

    = high winds

What you see on a weather map!



Warm front
Warm Front

  • Warm air slides over departing cold air.

  • Large bands of precipitation form


Why do warm fronts bring mild weather
Why do warm fronts bring mild weather?

  • It’s more difficult for the warm air to move against the cold dense air

  • Gradual difference in pressure and temperature

  • Drizzly rain

  • Followed by clear & warm

    weather

What you see in a weather map!



Occluded front
Occluded Front

  • Two cold air masses merge and force warm air between them to rise quickly.

  • Strong winds and heavy precipitation will occur.


Why do occluded fronts bring heavy rain and storms
Why do occluded fronts bring heavy rain and storms?

  • Cold air that is more dense moves into an area of low pressure = CONDENSATION occurs quickly

  • Forms cumulonimbus and nimbostratus clouds

What you see in a weather map!


Stationary front
Stationary Front

  • Warm and/or cold front stops moving.

  • Light wind and precipitation may occur across the front boundary.


Why do stationary fronts bring long light precipitation
Why do stationary fronts bring long light precipitation?

  • Neither front is strong enough to move the other

  • Can stay put for days

  • Differences in temperature = rain or snow

Whatyouseein a weather map!


Cyclones and anticyclones
Cyclones and Anticyclones

  • Areas of HIGH and LOW pressure

  • Cyclone = LOW PRESSURE = spin counterclockwise = associated with storms and precipitation

  • Anticyclone = HIGH PRESSURE = spin clockwise = associated with fair weather.




Check air mass chart 8
Check Air Mass Chart - # 8

1.Which is more dense, warm air or cold air? Cold air is more dense.

2. What do you think would happen if a large mass of cold air came into contact with a large mass of warm air? The cold air would sink down and the warm air mass would rise.


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