Atmospheric Pressures and Pressure Analyses

Pressures

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Isobars & Pressures

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Click here for latest Pressures map from website Click here for latest Isobars & Pressures map from website

The latest available pressures on both maps are in whole (integer) millibars at the UTC time and date displayed in the upper left margin. Stations for which the pressure values are given are considered centered on the number. To identify the stations, see Available Surface Stations. Pressures are "sea-level pressures" - those measured by a barometer at the site ("station pressure"), which are then reduced to sea level (0 meters elevation). This correction removes the dependence of pressure on the altitude of the measuring station leaving the pressure distribution related to the large scale weather systems.

Isobars (map on right) are blue lines which connect equal pressure values based on the set from 1000 mb with an interval of 4 mb above or below that. Isobar values are labeled in blue within the isobar lines that are contained in the map area. Additionally, centers of locally highest and lowest pressures are marked by a blue H and red L, respectively.

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