How fast is jet stream?
Jet streams vary in height of four to eight miles and can reach speeds of more than 275 mph (239 kts / 442 km/h ). Jet streams occur in both the Northern and Southern Hemispheres.
Where is the jet stream the fastest?
The strongest jet streams are the polar jets, at 9–12 km (5.6–7.5 mi; 30,000–39,000 ft) above sea level, and the higher altitude and somewhat weaker subtropical jets at 10–16 km (6.2–9.9 mi; 33,000–52,000 ft). The Northern Hemisphere and the Southern Hemisphere each have a polar jet and a subtropical jet.
What happens if you fly into a jet stream?
Besides a local weather storm, turbulence to an airplane may be caused by a plane flying into or out of a jet stream. The wind currents along the edges of the jet stream are choppy or turbulent as high-speed air meets more slowly moving, nearly stationary air (about 20 m.p.h.).
How fast is the Atlantic jet stream?
Off the Atlantic seaboard of the United States, the Gulf Stream flows at a rate nearly 300 times faster than the typical flow of the Amazon River. The velocity of the current is fastest near the surface, with the maximum speed typically about 5.6 miles per hour (nine kilometers per hour).
Are jet streams faster in summer?
They are faster in winter when the temperature differences between tropical, temperate, and polar air currents are greater. A reverse jet stream blows toward the west in tropical high altitudes during the Northern Hemispheres summer.
How many jet streams are there on Earth?
Earth has four primary jet streams: two polar jet streams, near the north and south poles, and two subtropical jet streams closer to the equator.
How high above the earth’s surface is the jet stream?
Jet streams are currents of air high above the Earth. They move eastward at altitudes of about 8 to 15 kilometers (5 to 9 miles).
Why would a pilot want catch a jet stream?
Commercial airline pilots have used jet streams since 1952, when a Pan Am flight flew from Tokyo to Honolulu at 25,000 feet in order to take advantage of one. By flying in a jet stream, planes traveling from west to east get a significant boost from the tailwind, which saves time and fuel.
Is Everest in the jet stream?
Everest, the world’s tallest mountain, are actually jet streams. Jet streams can be so cold, and so strong, that climbers cannot leave the shelter of their tents.
What is the average jet stream speed?
The greater the difference in air temperature, the faster the jet stream, which can reach speeds of up to 250 mph (402 kph) or greater, but average about 110 mph (177 kph). Both the Northern and Southern hemispheres have jet streams, although the jet streams in the north are more forceful.
How much wind speed does a typical jet stream produce?
Jet streams can split into two when they encounter an upper-level low, that diverts a portion of the jet stream under its base, while the remainder of the jet moves by to its north. The wind speeds are greatest where temperature differences between air masses are greatest, and often exceed 92 km/h (50 kn; 57 mph). 
What drives the jet stream?
Jet streams wander laterally dramatically, and have large changes in their altitude. The jet streams form near breaks in the tropopause, at the transitions between the Polar, Ferrel and Hadley circulation cells, and whose circulation, with the Coriolis force acting on those masses, drives the jet streams.
How fast can jet stream travel?
The polar jet stream can travel at speeds greater than 180 km/h (110 mph). Here, the fastest winds are coloured red; slower winds are blue.