This map is an example of an isotach map, which is a map that displays information about varying wind speeds across the globe and then connects wind speeds that are the same by a single line, therefore making it easier for the reader to see the patterns in the change of winds. This particular map is an isotach map of data that was taken from a "La Nina" in which the polar winds were lower then they should have been. There are several types of winds, including the polar jet stream, the Northwestern, etc. and the isotach maps are a great tool for tracking the patterns of similarity and changes, helping to predict, as this map also does, possible weather difficulties.
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