Jet Streams and Weather Patterns

What are jet streams?

• Rivers of water flowing high in the atmosphere.

• Narrow bands of fast winds high in the atmosphere.

• Invisible currents that only affect ocean temperatures.

• Slow-moving air masses that cause calm weather.

What causes jet streams to form?

• The Earth's rotation and uneven heating by the sun.

• Large mountains and ocean currents.

• The movement of tectonic plates.

• Constant rainfall and cloud formation.

What kind of weather do ridges and troughs in a jet stream usually bring?

• Ridges bring colder weather, and troughs bring warmer weather.

• Ridges bring warmer, drier weather, and troughs bring colder, unsettled weather.

• Both ridges and troughs always bring heavy rain.

• Both ridges and troughs always bring clear skies.

What happens when a jet stream becomes slower and more distorted?

• Weather becomes more stable and predictable.

• It causes weather systems to move faster.

• It can lead to prolonged extreme weather events like heatwaves or droughts.

• It has no significant effect on local weather.

What is the Polar Vortex?

• A large circulation of extremely cold air high above the Arctic.

• A warm ocean current near the equator.

• A type of tropical storm.

• A strong wind current found only in the Southern Hemisphere.

What happens when the Polar Vortex becomes disrupted or weakened?

• Warm air is locked near the pole.

• Cold Arctic air can move to places like the United States, Europe, and Asia.

• The jet stream becomes stronger and more stable.

• Tropical storms become more frequent.

What causes the position and strength of the jet stream to change?

• Changes in tropical ocean temperatures.

• The amount of sunlight hitting the Earth.

• The rotation speed of the Earth.

• Volcanic eruptions.

During a negative phase of the Arctic Oscillation, what happens to the jet stream?

• It becomes stronger and keeps cold air at the poles.

• It weakens and becomes more distorted, increasing cold air outbreaks.

• It completely disappears.

• It moves closer to the equator.