A barometer is a scientific instrument used in meteorology to measure atmospheric pressure. Pressure tendency can forecast short term changes in the weather. Numerous measurements of air pressure are used within surface weather analysis to help find surface troughs, high pressure systems and frontal boundaries.
The graph displays the other subjects mentioned on the same pages as the subject “barometer”. If the same subject occurs on a page with “barometer” more than once, it appears closer to “barometer” on the graph, and is colored in a darker shade. The closer a subject is to the center, the more "related" the subjects are.