Air PressurePressure and WeatherWeatherAir PressurePressure and WeatherWeather

What different kinds of weather do high and low pressure create?

Different kinds of Air PressureDifferent kinds of Air PressureWhat’s the difference between high and low pressure?

Air that is sinking Air that is rising

Air is pressing down onto the surface of

the earth.

Air is lifting off and moving away from the surface of the earth.

Different kinds of Air PressureDifferent kinds of Air PressureWhat would happen to this air?

Cold airCold airWarm airWarm air

Molecules far apart.Molecules far apart. Molecules close together.Molecules close together.

Molecules moving around a lot.

Molecules moving around a lot.

Molecules not moving around much.

Molecules not moving around much.

Less dense.Less dense. More dense.More dense.

Weather under High pressureWeather under High pressureWhat kind of weather does high pressure create?

As the air sinks it warms up and so there is less chance of condensation.As the air sinks it warms up and so

there is less chance of condensation.

Weather under High pressureWeather under High pressureWhat kind of weather does high pressure create?

Weather under Low pressureWeather under Low pressureWhat kind of weather does low pressure create?

Warm air rises.Warm air rises.

As it rises the air cools.

As it rises the air cools.

As the air cools, water in it condenses forming clouds.As the air cools, water in it condenses forming clouds.

Weather under Low pressureWeather under Low pressureWhat kind of weather does low pressure create?

Weather under Low pressureWeather under Low pressureWhat happens when warm and cold air meet?

The warm air is less dense

The warm air is less dense

Cold airCold airCold airCold air Warm airWarm airWarm airWarm air

The cold air is more dense

The cold air is more dense

The warm air rises over the cold air and

cools down.

The warm air rises over the cold air and

cools down.

This is a frontThis is a front

Weather under Low pressureWeather under Low pressureWhat kind of weather does low pressure create?

Warm air rises over colder/cool air because it less dense.

Warm air rises over colder/cool air because it less dense.

As the warm air rises is cools.

As the warm air rises is cools.

As the air cools, water in it condenses

forming clouds.

As the air cools, water in it condenses

forming clouds.

Weather under Low pressureWeather under Low pressureWhat kind of weather does low pressure create?

Cold air pushes under warm air

because it is more dense.

Cold air pushes under warm air

because it is more dense.

The less dense warm air is

pushed upwards and as it rises it

cools.

The less dense warm air is

pushed upwards and as it rises it

cools.

As the air cools, water in it condenses

forming clouds.

As the air cools, water in it condenses

forming clouds.

Weather under Low pressureWeather under Low pressureHow does weather in a depression change?

Cold FrontCold air forces the warm air up producing cloud

and rain.

Cold FrontCold air forces the warm air up producing cloud

and rain.

Warm SectorThe temperature rises, its cloudy

with a few showers but no heavy rain.

Warm SectorThe temperature rises, its cloudy

with a few showers but no heavy rain.

Warm FrontWarm air rises over cold air,

producing cloud and rain.

Warm FrontWarm air rises over cold air,

producing cloud and rain.