DSM 2000 Chapter : Severe Weather
15 Mar 2019
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Document Summary
Calculated as the change in pressure between two locations dividen by the. Denoted by the letter h" on a weather map. Region of higher air pressure than the air around it. Isobars: blue lines that connect points of equal air pressure. Wind speed is directly proportional to the pgf. If the pgf is high, the wind speed is high and vice versa. Object in the nh moving s -> n will be deflected to the east. Same object moving n -> s will be deflected to the west. Represents the weight of the atmosphere on the surface of the earth. Measured in millibars (mb) or inches of mercury. Pressure gradient: air pressure always flows from high pressure to low pressure -> pressure gradient force (pgf) change in distance of those two locations. In the nh, the movement of air around a high is always clockwise and around a low it is always counterclockwise.
