Jet streams are the concentrated bands of rapid air movement found in troposphere and stratosphere. The meeting front of warm and cold winds along sub-tropical zone near 30° latitude and polar front along 60° latitude. Jet streams transport moisture and help in formation of cyclonic winds. Jet streams are used to forecast the weather specially for air travel, so that the flying should be done according to the jet-streams. Mostly, these jet-streams blow from west to east with the Westerlies.
