Regional Gliding School Also known as a cyclone or a depression Wind flows counterclockwise and...

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


Secondary LowSmaller disturbance of cyclone nature

Forms within a main depression

L LLL

PRESSURE SYSTEMS

LL LLLL


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


High Pressure Areaalso known as anticyclone

wind flows clockwise and outwards

pressure highest in centre

expect fine to fair weatherH

PRESSURE SYSTEMS


PRESSURE SYSTEMS


NOTE: You must use the buttons in the Confirmation Stage


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

I’m afraid that answer is incorrect

Let's try again...

Flying Scholarship Program


Let's try again...



Let's try again...



That answer is correct.

Let's move on...


Also known as a cyclone or adepression

Wind flows counterclockwiseand inward

Pressure is lowest in thecentre

Expect poor weatherL

PRESSURE SYSTEMSLow Pressure Area


A

B

C

D

Ridge

Col

Trough

Secondary low


Question #2 - A U shaped area of low pressure with areas of higher pressure on either side is known

as a .



Let's try again...



Let's try again...



Let's try again...




Let's move on...


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


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

Winds

HL


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


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


North Pole

Earth rotates counterclockwise

Coriolis Force


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.


Surface Friction


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

Buys Ballots Law


NOTE: You must use the buttons in the Confirmation Stage


A

B

C

D

Pressure gradient

Coriolis force

Surface friction

Buys Ballots Law


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

.



Let's try again...



Let's try again...



Let's try again...




Let's move on...


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



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

B

C

D

Pressure gradient

Coriolis force

Surface friction

Buys Ballots Law


Let's try again...



Let's try again...



Let's try again...




Let's move on...


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


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!


Date post:	01-Apr-2015
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Regional Gliding School Also known as a cyclone or a depression Wind flows counterclockwise and...

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