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# Science EQ: What causes weather? Do Now: 3-19 - PowerPoint PPT Presentation

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

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 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

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 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.

• 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 air slides over departing cold air.

• Large bands of precipitation form

• 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!

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

• Strong winds and heavy precipitation will occur.

• 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!

• Warm and/or cold front stops moving.

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

• Neither front is strong enough to move the other

• Can stay put for days

• Differences in temperature = rain or snow

Whatyouseein a weather map!

• 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.

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.