How to read a weather map: Do you know your isobars from your weather fronts?
Most of us have seen weather maps at some point in our lives – in geography lessons at school, or in weather forecasts. But what do all the lines, labels and shapes actually mean? 1. Air pressure Areas of high and low air pressure are labelled on weather maps with the letters H and L. High pressure generally brings calm, dry and settled weather, whereas low pressure typically means unsettled weather, with cloud , wind and rain . 2. Isobars The continuous parallel lines with numbers on them are called isobars and connect areas with the same air pressure. The closer the isobars are together, the stronger the wind will be. 3. Weather fronts These define the boundaries between different air masses, typically bringing cloud, precipitation and changes in temperature and humidity. They’re depicted through coloured lines with shapes on one side, with the side featuring the shapes showing the direction of movement. Warm fronts are shown through red lines featuring semi-circles, whi...