![]() ![]() Since precipitation is one of the three main weather parameters along with air temperature and wind, this type of isoline has additional subtypes, too:Īn isochalaz is a line of hail storms - lumps of ice, that can break through the roof of a car. The isohyet map of the equal precipitation of the Claudette tropical storm in the area of Fort Worth, Texas, USA, in July 24–27, 1979 / NOAA An isodrosotherm is an isoline of the dew point temperature values - the temperature to which the air needs to be cooled so that water condensate is released from it (dew appears).Īn isohyet is a contour line of the same precipitation: rain, snow, and others.An isogeotherm is the same line of the temperature beneath the Earth’s surface.An isothere is a contour line of equal mean summer temperature and an isocheim - a line of equal mean winter temperature.There are at least three additional types of isolines related to temperature: The first map with isotherms on it was published by famous German geographer and naturalist Alexander von Humboldt in Paris, in 1817. Such maps will be different for different seasons. You get a map of average temperatures (to be precise - usually, average annual temperatures). Atmosphere Air temperatureĪn isotherm is an isoline that shows the equal temperature. What are we talking about? This line is also used by geologists to draw maps of the neotectonic movements of the Earth’s crust.Īn isogon or isogonic line (which we already used to determine the same wind direction on the map), is also a contour line of constant magnetic declination - a variation of magnetic north from geographic north.Īn isodynama is an isoline of the same magnetic field strengths of the Earth. An isobase is a contour line connecting points in the earth that rise or fall with equal velocity or amplitude.Maps with such lines are used by professional petroleum geologists, volcanologists, and other similar specialists to illustrate variations in the thickness of geologic units. An isopach is a rare line of the same thickness as the bedrock.An isocline is an isoline that shows the equal slope of the land surface and the degree of slope smoothing.As human activity has always been connected to water, isobaths are the oldest types of isolines used since 1584 in Holland.Īn isobaths on a fragment of a map of the coast of Madeira Island, Portugal made by António Pedro de Azevedo in 1867 / WikipediaĪn isohypse is an isoline that connects points of equal height and thus shows all the features of the terrain - mountain peaks, slopes, and hills, passes, and valleys. Historically, this is the second oldest type of contour line in the world.Ī few more isolines are related to the topography: It can be anything - an ocean, sea, lake, or river. Earth ReliefĪn isobath is a contour line connecting points of equal depths of a body of water. But let us first deal with topographic maps showing the relief, on which isolines began to be used, and only afterward - in other areas of human activity, including weather forecasting. We also highlighted in yellow the most important isolines that you may see on the maps most often. In this post, we’ll list all the main types of contour lines and learn why we need them. In particular, specific names are most common precisely in meteorology. But these are just two of more than 20 main types of isolines or contour lines that will help you predict the weather.Įach isoline has a special name, which begins with the word “iso” (from the ancient Greek word “ισος” - “equal”) and further contains one or another parameter. Regular readers of Windy.app’s blog already know what isotherms and isobars are. ![]()
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