What is a jet stream in weather?

Answer 1

Jet streams are fast flowing, narrow air currents found at the tropopause, the transition between the troposphere (where temperature decreases with height) and the stratosphere (where temperature increases with height) and are located at 10-15 kilometers above the surface of the Earth.

They form near boundaries of adjacent air masses with significant differences in temperature. They tend to flow west to east and are often lower in the winter within the United States.

The weather service for aviation considers sustained winds of 50 knots to be the beginning of the jet stream. In the winter, the jet stream in North America tends to dip lower then the summer months and the isobars get tighter. Tighter isobars mean more significant lower winds, thus a lower jet stream.

Jet streams tend to assist aircraft flying east and slow aircraft heading westerly.

Jet Stream are narrow bands of strong winds that blow near the top of the troposphere. High speed, high altitude winds.

a fast ribbon of air that travels around the earth

Answer 2

In meteorology, a jet stream is a fast flowing sinuous air current found in the upper level of the atmosphere. On Earth, the jet streams are found more precisely near the tropopause, between the troposphere (an atmosphere layer where the air temperature decreases with the altitude) and the stratosphere (an atmosphere layer where the air temperature increases with the altitude), usually between 7 and 16 km above the sea level. The major part of the jet stream are westerlies, which are the prevailing winds in mid-latitudes which flows from west to east. The strongest and the lowest jet streams are the polar jet streams (located between 7 and 12 km above the sea level) while the weakest and the highest ones are the subtropical jet streams (located between 10 and 16 km above the sea level. The Northern and the Southern Hemisphere have both a polar jet stream and a subtropical jet stream. The formation of the jet stream on Earth result from the Earth's rotation and the inegal solar heating of the atmosphere (the thermal energy received by the solar radiation varies from a location to another : it'll be hotter towards the Equator than towards the Poles). The jet streams are formed in conflict areas between different air masses, these zones are called the fronts, in which there is a great differente of temperature, pressure and relative humidity. There are several types of fronts, such as the warm fronts, the cold fronts, the stationary fronts and the occluded fronts.

Answer 3

Because jet streams can go to 110-300 mgh.

Answer 4

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Answer 5

A thermal or updraft.