Geography- weather events

Two main weather systems

Anticyclones + depressions

What are isobars

A line on a weather map connecting places of equal atmospheric pressure

Isobars showing depressions

Decrease towards the centre, letter L

Isobars showing anticyclones

Isobars increase towards centre, letter H

What is an anticyclone

Area of high pressure air mass

Do clouds form in anticyclones

No warm air absorbs the moisture

What was does the air move in an anticyclone

Clockwise from Center out

What kind of weather do anticyclones bring

Dry weather

What are depressions

Areas of low air pressure

Depressions are also called

Lows or cyclones

How long can a depression last

Around 24 hours

What kind of rainfall do depressions bring

Frontal

What’s a front

A boundary between warm and cold air

How does a depression form

Two air masses meet cold air wraps around warm air and warm air rises and cools causing condensation and clouds whole weather system moves east and rain falls on fronts

Which way does a depression swirl

Anti-clockwise into each other

What kind of weather do depressions bring

Cloudy,wet,windy weather

Are winds strong in a low

Yes because as the wind rises it’s more affected my earths rotation

What is an example of a significant weather event

A hurricane

Where do hurricanes form

Of the west coast of Africa

How hot the ocean needs to be to form a hurricane

26°c+