Chapter 11: Ascending and Descending AirDifferent weathers

Low Pressure Systems High Pressure Systems

Low Pressure: Also known as:• Lows• Depressions• Cyclones(Pressure is lowest in the centre)

High Pressure: Also known as:• Highs• Anti-cyclones

(Pressure is highest in the centre)

Weather of a low pressure system:Strong Winds (blowing in towards the centre)Much cloud (caused by warm air rising and condensation)Much Precipitation (condensation causes clouds which usually leads to rain.)

Weather of a high pressure system:Light winds (blow away from the centre)No cloud (no ascending air, no condensation, no cloud)Dry weather (less clouds = less rain)

Do you know the difference?

Chapter 11: Main DetailsLow pressure systems:• Recognise on a weather map• Also known as….• Weather of a Low

High pressure systems:• Recognise on a weather map• Also known as….• Weather of a High

WeatherClimateAir MassFrontPolar FrontIsobarsMillibars