jet stream(redirected from Polar jet stream)
Also found in: Thesaurus, Encyclopedia.
Related to Polar jet stream: Subtropical jet stream
1. A high-speed, meandering wind current, generally moving from a westerly direction at speeds often exceeding 400 kilometers (250 miles) per hour at altitudes of 10 to 15 kilometers (6 to 9 miles).
2. A high-speed stream; a jet.
1. (Physical Geography) meteorol a narrow belt of high-altitude winds (about 12 000 metres high) moving east at high speeds and having an important effect on frontogenesis
2. (Aeronautics) the jet of exhaust gases produced by a gas turbine, rocket motor, etc
1. strong, generally westerly winds concentrated in a relatively narrow and shallow stream in the upper troposphere of the earth.
2. the exhaust of a jet or rocket engine.
A narrow current of strong wind circling the Earth from west to east at altitudes of 10 to 15 miles (16 to 24 kilometers) above sea level. There are usually four distinct jet streams, two each in the Northern and Southern Hemispheres.
A narrow band of high velocity wind in the upper troposphere or in the stratosphere.
A narrow corridor of fast-moving air at high altitude.