Synoptic chart revision

Front

What is barometric pressure?

Back

The pressure exerted by the weight of the air on Earth's surface, measured in hectopascals (hPa).

Front

What are isobars?

Back

Lines joining places of equal atmospheric pressure, mapped on synoptic charts.

Front

How are pressure cells defined?

Back

By the patterns formed by isobars.

Front

What characterizes high-pressure systems?

Back

Light winds, clear skies, dry weather, and a high diurnal temperature range.

Front

How do high-pressure systems rotate?

Back

- Northern Hemisphere: Clockwise - Southern Hemisphere: Anticlockwise

Front

What is a ridge?

Back

An extension of high pressure from a high-pressure system.

Front

What characterizes low-pressure systems?

Back

Stronger winds, cloudy skies, rain, and a lower diurnal temperature range.

Front

How do low-pressure systems rotate?

Back

- Northern Hemisphere: Anticlockwise - Southern Hemisphere: Clockwise

Front

What is a trough?

Back

An extension of low pressure from a low-pressure system.

Front

What are tropical cyclones?

Back

Intense low-pressure systems with strong winds, rough seas, and heavy rain, causing widespread damage if they make landfall.