Hourly weather observations that include sea-level pressure ... on weather maps that meteorologists can analyze. Isobars are drawn by connecting points having equal sea-level air pressure, using ...

Global warming is redrawing the isobars on weather maps. Researchers have found that changes in air pressure over the past 50 years bear the fingerprint of human influence 1. This is the first ...

Low pressure is shown on an isobar map when the numbers are 1000mb or below. Depressions will bring rain. Winds will be calmer in a depression. Depressions move in an anticlockwise direction.

On the map the isobar marked 1004 represents an area of high pressure, while the isobar marked 976 represents an area of low pressure. Not only do isobars tell us whether there is high or low ...