More: on a map with isobars you can also determine wind direction and strength by looking at the location of the line.įor example, in the Windy.app, on the time of publishing of this manua, north of Halifax, Nova Scotia, Canada, we see a large area of low pressure (L) and many isobar lines around it that are very close to each other:Ĭounter lines on the Weather Map in the Windy.app for iOS Second, remember the types of contour lines This is how isolines can be used to determine the weather for a given parameter. The same applies to isotherms on a map with the equal temperature, isobars on a map with the equal atmospheric pressure, and so on. Conversely, lines far apart indicate a gentle slope. When lines are located close to each other, it means a big value and/or fast change of this value, and when they are far from each other, it means a smaller value and slower change.Īgain, the easiest way to understand this is to look at a map of terrain: a lot of isolines close to each other on a map means that it is a high mountain with a steep slope. This is the most important thing from this manual. First, pay attention to the location of the contour lines Generally speaking, it is very simple because the principle of reading them is the same for all types of isolines. In this one, we will learn how to read contour lines to quickly get the information you need. In the past two posts, we learned the definition and an interesting history of invention of isolines, as well as the basic types of such lines we can see on weather and other maps.
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