The jet stream streaks high above Mount Rainier, the tallest mountain in Washington state, in this view from the summit of Mount Adams. Jet streams are fast-flowing, narrow air currents. Shown here is the northern hemisphere polar jet, which flows over the middle to northern latitudes of North America, Europe, and Asia and their intervening oceans, typically between 23,000-39,000 feet (7-12 km) above sea level. Mount Rainier is 14,410 feet (4,392 meters) tall. Both Rainier and Adams are volcanoes.
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