Jet streams usually blow at 50 knots, but have been measured up to 215 knots. Converted to miles per hour, jet streams can blow around 247 miles per hour. This is just wind moving around the earth because of temperature differences amongst the globe.
It is called a jet stream for a reason. Jet streams blow at a range of 180 to 220 kilometers per hour. They do not flow in a regular pattern. They circle the world in a stream that flows from east to west and even sometimes from north to south.
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