Download Global Winds_Jet Stream

Science starter
• Predicting Practice…again! Use the
weather map below to make a
prediction of tomorrow’s weather.
Science starter
• Use the weather map below to
make a prediction of tomorrow’s
weather.
Global winds
• Found in each convection region
• Look like they curve
– Why?
• Convection regions are in specific locations
• Earth spins on its axis
– What is curving of winds called?
• Coriolis Effect
• Dominate direction of winds and how air
moves within each region affects weather
Coriolis effect
• Curving of global
winds
• Caused by spinning
of earth and
unchanging location
of convection regions
Easterlies
Types of global winds
• Trade Winds
– Found in tropical zone
• Westerly Winds
– Found in temperate zone
• Polar/Easterly Winds
– Found in polar zone
Trade winds
• Direction: east to
west
• Region/Zone: tropical
• Move warm tropical
air within the tropical
region
westerly winds
• Direction: west to
east
• Region/Zone:
temperate
• Temperate zone has
distinct seasons
• United States is in
temperate zone
– Our weather systems
move west to east
Polar/easterly winds
• Direction: northeast
to west
• Region/Zone: polar
• Move cold polar air
within polar region
• Move cold polar air
toward west
Jet stream
• Fast moving ribbon of air
• Moves from west to east in Northern
Hemisphere
• Dips and bends
• Constantly changes positions
• Air masses & weather systems in path of
jet stream are moved by it
• 2 types:
– Polar Jet Stream
– Subtropical Jet Stream
Jet stream
**The facts below are true
for the Northern
Hemisphere of Earth
ONLY**
• Polar Jet Stream:
– Brings down cold polar
conditions from north
• Subtropical Jet Stream:
– Brings up warm tropical
conditions from south