Wind speeds in the jet stream are usually about 150 to 300 miles per hour – but they can reach up to at least 450 miles per hour. The strongest jet stream winds are usually found at about 30,000 feet above the ground. The movement of air in the jet stream is essential to maintaining stable climates in many parts of the world. Unfortunately however, global warming is threatening to weaken or alter the course of the jet stream, with potential negative effects that include an increased incidence of hurricanes off the coasts of North America.
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