High Pressure Systems:
- on a weather map, looks like a blue H
- located where the measured air pressure is highest compared to its surroundings
- winds flow clockwise and outward in the northern hemisphere
- sinking air prevents cloud formation and precipitation
Low Pressure Systems:
- on weather map, looks like red L
- located where the measured air pressure is lowest compared to its surroundings
- winds flow counterclockwise and inwards
- rising air develops clouds and precipitation/ warm moist air rises, expands, and cools to form this precipitation
Also remember:
Pressure is measured by a barometer which drops when there is low air pressure and rises when there is high pressure.
Air pressure decreases when altitude, humidity, or temperature increase.
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