The Equatorial Jet Stream, located at approximately FL500, or around the 100 hPa level, flows intermittently east to west across Asia and Africa but does not extend into the Atlantic. It is at its strongest in the months of July and August.he Sub-tropical jet Stream is located entirely within the tropical air mass and is not associated with any surface fronts. Its location is less variable than the Polar Jet Streams, and its altitude is at around the 200 hPa level.