Presentation on theme: "STANDARD GRADE ANTICYCLONES John Smith Invergordon Academy."— Presentation transcript:
STANDARD GRADE ANTICYCLONES John Smith Invergordon Academy
HIGH PRESSURE SYSTEMS High pressure systems are also known as anticyclones
The Earths surface The Earths atmosphere presses down on the surface of the Earth. HIGH ATMOSPHERIC PRESSURE Cold, dense air falls. This increases the weight of the air pressing down on the Earths surface.
WHAT CAUSES HIGH PRESSURE? When air high in the atmosphere is cold, it falls towards the earths surface. Falling air increases the weight of air pressing down on the Earths surface. This means that air pressure is high.
WHAT WEATHER DOES HIGH PRESSURE BRING? As the cold air falls through the atmosphere, it becomes slightly warmer. Because warm air can hold more moisture than cold air, no condensation or clouds occur. This means that high pressure systems bring clear skies. Winds are usually light, and blow out of the high pressure area. There are no warm or cold fronts in high pressure areas.
HIGH PRESSURE IN WINTER High pressure in winter gives us clear skies very low temperatures calm, or light winds no precipitation frosty conditions