Regional Gliding School
Also known as a cyclone or a depression
Wind flows counterclockwise and inward
Pressure is lowest in the centre
Expect poor weatherL
PRESSURE SYSTEMSLow Pressure Area
Regional Gliding School
Secondary LowSmaller disturbance of cyclone nature
Forms within a main depression
L LLL
PRESSURE SYSTEMS
LL LLLL
Regional Gliding School
U-shaped area of low pressure with higher pressure on either side
PRESSURE SYSTEMS
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
High Pressure Areaalso known as anticyclone
wind flows clockwise and outwards
pressure highest in centre
expect fine to fair weatherH
PRESSURE SYSTEMS
Regional Gliding School
PRESSURE SYSTEMS
Regional Gliding School
NOTE: You must use the buttons in the Confirmation Stage
Regional Gliding School
A
B
C
D
Anticlockwise and inward
Clockwise and outward
Let's try a few review questions on Meteorology:
Question #1 - What direction does the wind flow around a low pressure area?
MeteorologyMeteorologyPressure SystemsPressure Systems
Anticlockwise and outward
Clockwise and inward
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That answer is correct.
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Regional Gliding School
Also known as a cyclone or adepression
Wind flows counterclockwiseand inward
Pressure is lowest in thecentre
Expect poor weatherL
PRESSURE SYSTEMSLow Pressure Area
Regional Gliding School
A
B
C
D
Ridge
Col
Trough
Secondary low
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 .
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Regional Gliding School
U-shaped area of low pressure with higher pressure on either side
PRESSURE SYSTEMS
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
Winds always flow from an area of high pressure to an area of low pressure.
Winds
HL
Regional Gliding School
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
Pressure Gradient
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.
Forces Affecting Horizontal Air Movement
Coriolis Force
Regional Gliding School
North Pole
Earth rotates counterclockwise
Coriolis Force
Regional Gliding School
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
Surface Friction
Regional Gliding School
In the Northern Hemisphere, when you stand with your back to the wind, the low pressure area is to your left.
Forces Affecting Horizontal Air Movement
Buys Ballots Law
Regional Gliding School
L
Buys Ballots Law
Regional Gliding School
NOTE: You must use the buttons in the Confirmation Stage
Regional Gliding School
A
B
C
D
Pressure gradient
Coriolis force
Surface friction
Buys Ballots Law
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
.
MeteorologyMeteorologyPressure SystemsPressure Systems
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Regional Gliding School
Because the earth rotates beneath theatmosphere, air is deflected to the right inthe Northern Hemisphere, until it flowsparallel to the isobars.
Forces Affecting HorizontalAir Movement
Coriolis Force
Regional Gliding School
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 .
MeteorologyMeteorologyPressure SystemsPressure Systems
A
B
C
D
Pressure gradient
Coriolis force
Surface friction
Buys Ballots Law
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That answer is correct.
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Regional Gliding School
In the Northern Hemisphere, when youstand with your back to the wind, the lowpressure area is to your left.
Forces Affecting HorizontalAir Movement
Buys Ballots Law
Regional Gliding School
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!
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