4 3 . Pressure Systems

PRESSURE SYSTEMS Low Pressure Area L Also known as a cyclone or a depression Wind flows counterclockwise and inward Pressure is lowest in the centre Expect poor weather L

PRESSURE SYSTEMS Secondary Low L Smaller disturbance of cyclone nature Forms within a main depression L

PRESSURE SYSTEMS Trough Ridge Col U-shaped area of low pressure with higher pressure on either side Trough similar to a trough but extends outward from a high with lower pressure on either side Ridge a neutral area between two highs and two lows Col

PRESSURE SYSTEMS High Pressure Area H also known as anticyclone wind flows clockwise and outwards pressure highest in centre expect fine to fair weather H

PRESSURE SYSTEMS

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Meteorology Pressure Systems Let's try a few review questions on Meteorology: Question #1 - What direction does the wind flow around a low pressure area? A Anticlockwise and inward B Clockwise and outward C Anticlockwise and outward Clockwise and inward D

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Meteorology Pressure Systems Let's try a few review questions on Meteorology: Question #2 - A U shaped area of low pressure with areas of higher pressure on either side is known as a . A Ridge B Col C Trough D Secondary low

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Winds Winds always flow from an area of high pressure to an area of low pressure. H L

Forces Affecting Horizontal Air Movement Pressure Gradient The rate of change of pressure over distance measured at right angles to the isobars. It is steepest when isobars are close. It determines wind velocity (the closer the isobars the stronger the winds).

Forces Affecting Horizontal Air Movement Coriolis Force Because the earth rotates beneath the atmosphere, air is deflected to the right in the Northern Hemisphere, until it flows parallel to the isobars.

Coriolis Force Earth rotates counterclockwise North Pole

Forces Affecting Horizontal Air Movement Surface Friction Friction between the surface of the earth and the atmosphere will slow the movement of air. This, in turn, increases the angle at which the air crosses the isobars.

Forces Affecting Horizontal Air Movement Buys Ballot’s Law In the Northern Hemisphere, when you stand with your back to the wind, the low pressure area is to your left.

Buys Ballots Law L

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Meteorology Pressure Systems Let's try a few review questions on Meteorology: Question #3 - Because the earth rotates beneath the atmosphere air is deflected to the right, in the Northern Hemisphere, until it flows parallel to the isobars. This phenomena is known as . A Pressure gradient B Coriolis force C Surface friction D Buys Ballots Law

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Meteorology Pressure Systems Let's try a few review questions on Meteorology: Question #4 - In the Northern Hemisphere, when you stand with your back to the wind, the center of the low is to your left. This phenomena is known as . A Pressure gradient B Coriolis force C Surface friction D Buys Ballots Law

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Meteorology Pressure Systems Congratulations!! You have now completed the Pressure Systems lesson of the Meteorology Module. Of course, this lesson is always available to you for future reference if required. You are now ready to move along to the next Meteorology lesson you have not completed or to any other module you wish. You can advance to the Self Test Module if you feel ready to challenge the final exam. Good Luck!