PRESSURE SYSTEMS Low Pressure Area Also known as

PRESSURE SYSTEMS Low Pressure Area ÆAlso known as a cyclone or a depression ÆWind flows counterclockwise and inward ÆPressure is lowest in the centre ÆExpect poor weather Regional Gliding School L

PRESSURE SYSTEMS Secondary Low àSmaller disturbance of cyclone nature àForms within a main depression Regional Gliding School L L L

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

PRESSURE SYSTEMS High Pressure Area Äalso known as anticyclone Äwind flows clockwise and outwards Äpressure highest in centre Äexpect fine to fair weather Regional Gliding School H

PRESSURE SYSTEMS Regional Gliding School

NOTE: You must use the buttons in the Confirmation Stage Regional Gliding School

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

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Meteorology Pressure Systems Let's try a few review questions on Meteorology: Question #2 - Regional Gliding School 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 always flow from an area of high pressure to an area of low pressure. H Regional Gliding School L

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

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

Coriolis Force Earth rotates counterclockwise North Pole Regional Gliding School

Forces Affecting Horizontal Air Movement Surface Friction u 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. Regional Gliding School

Forces Affecting Horizontal Air Movement Buys Ballots Law u In the Northern Hemisphere, when you stand with your back to the wind, the low pressure area is to your left. Regional Gliding School

Buys Ballots Law L Regional Gliding School

NOTE: You must use the buttons in the Confirmation Stage Regional Gliding School

Meteorology Pressure Systems Let's try a few review questions on Meteorology: Question #3 - Regional Gliding School 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 - Regional Gliding School 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! Regional Gliding School