Weather under high and low pressure
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Transcript of Weather under high and low pressure
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.