Fronts and Low Pressure Systems

Ever wondered how the low-pressure systems that bring rain to Spain are formed? Behind each system lies a fascinating process that begins thousands of kilometers away, where air masses with opposite characteristics collide in the so-called "Polar Front". In this guide you'll learn how the lows that affect our weather are born, grow and die.

What is a Weather Front?

A front is the contact zone between two air masses with different characteristics, especially in temperature and humidity. Imagine two armies clashing: cold air (dense and heavy) against warm air (light and humid). This battle creates the most spectacular weather phenomena.

Diagram showing the four types of weather fronts with their symbols

The Polar Front: The Storm Factory

Diagram of the Polar Front showing how low pressure systems form

How a Low Pressure System Forms: The Complete Cycle

Complete life cycle of an extratropical low in 6 phases

Low pressure systems follow a well-defined life cycle from formation to dissipation, typically lasting 3-7 days.


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