This is False...studied the weather since I was like 5 years old. Thirty years late still enjoy the weather. The jet stream is located just below the Troposhphere which is located about 6 miles high or 9.5km. You need to use the 200-300hpa maps ideally to view the jet stream winds. Looking at the current direction I'd say they are pretty normal.

Current Jet Stream Below:

[link to www.windyty.com (secure)]