Be able to: Explain where and when monsoons occur.

Identify and define where Jet Streams are.

Mesoscale Sea & Land Breeze

Mesoscale Valley & Mountain Breeze

Macroscale Global Circulation

Non-rotating Earth

Rotating Earth

Idealized Pressure Belts & Prevailing Winds

Seasonal Pressure and Wind Patterns

The greatest seasonal change in Earth’s global circulation is the monsoon .

Monsoon – the seasonal reversal of wind direction associated with large continents, especially Asia. ◦ In winter – the wind blows

from land to sea. ◦ In summer – it blows from sea

to land. Asian Monsoon North American Monsoon

Jet Streams (Polar Jet Stream)

◦ Fast moving horizontal winds high above in the atmosphere. Top of troposphere

◦ These winds help steer storms. ◦ Greater than 50 knots can

exceed 300 mph. 1 Knot = 1.15 mph

location of the strongest surface temperature contrast.

The Jet stream is the strongest during the winter and weakest during the summer.