Hourly weather observations that include sea-level pressure are plotted or printed on weather maps. Isobars are drawn by connecting points having equal sea-level air pressure, using a specified ...

A bar is a metric unit of pressure and isobars are lines on a weather map that connect points of equal air pressure. Because variations in air pressure drive atmospheric winds, isobars give ...

THE Meteorological Council has just issued a folio of synchronous weather charts for the North Atlantic Ocean and the adjacent continents, those now published forming the first part of a series which ...