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Air Pressure and Winds. Triple A Productions A rnold Roberts A llison Couch A my Jacobs. Pressure Gradient Force. Pressure differences existing between areas cause air to blow from an area of high pressure toward an area of low pressure. Balancing Pressure Differences. Warm Air. Wind.

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air pressure and winds

Air Pressure and Winds

Triple A Productions

Arnold Roberts

Allison Couch

Amy Jacobs

pressure gradient force

Pressure Gradient Force

Pressure differences existing between areas cause air to blow from an area of high pressure toward an area of low pressure

balancing pressure differences
Balancing Pressure Differences

Warm Air


High Pressure Zone

Heavy Air

Low Pressure Zone

Heavy air stays close to the Earth’s surface

Winds are produced

Warm air is moved in an upward motion

differences in pressure zones
Differences in Pressure Zones

If distance between high and low are short

1. pressure gradient is steep

2. wind velocities are great

If gentle air movements occur when zones are far apart

1. the degree of difference is not great

convection system
Convection System

The circulatory motion of descending cool air and ascending warm air

the coriolis effect

The Coriolis Effect

As winds move from high pressure to low pressure:

winds in the N. Hemisphere tend to travel to the right,

winds in the S. Hemisphere tend to travel to the left

coriolis effect
Coriolis Effect

The skaters in the middle of the circle do not need to move very quickly, while the out most skaters have to move rapidly to maintain this line

how does this relate
How does this relate?

The Earth rotates on its axis

Equatorial regions are rotating much faster

Polar regions are rotating much slower

coriolis effect with pressure gradient force
Coriolis Effect with Pressure Gradient Force

When together they produce spirals rather then straight lines of wind

The spiral is the basic form of many storms

the frictional effect

The Frictional Effect

The cause of wind to follow an intermediate path


Movements are slowed due to friction on Earth’s surface

Friction becomes ineffective about 1 mile above the Earth’s surface

Friction causes wind speed to decrease and change direction

global air circulation
Global Air Circulation
  • Equatorial Low Pressure
  • Areas of low pressure at the equator line
  • Subtropical High Pressure
  • Cooled heavier air from the equatorial air pressure
  • Northeast Trades and Westerlies (Southwesterlies)
  • Belts of wind caused by the cooled air reaching the earths surface
  • Polar Air Pressure
  • Subpolar low is ascending air north of the westerlies
  • Polar Easterlies connect the Subpolar low to the Polar high pressure
  • Has the greatest effect on Jet Streams

jet streams
Jet Streams
  • Strongest flows of upper air wind
  • 30,000 – 40,0000 feet from the earths surface
  • Air travels East to West, in both hemispheres, at 100 – 200 MPH
  • Tends to separate cold polar air from warm tropical air
  • Movement of the Jet Stream has the greatest effect on monsoon season in Southeast Asia
  • Monsoon wind changes directions seasonally
  • Sothern and Eastern Asia is effected by this phenomena the most