High-altitude "Space" balloons over Oregon

High Altitude Weather Balloon Launch - #OLHZN17

New Scientist - Near Space Labs’s autonomous balloon fleet...

High altitude surveillance balloon, which is suspected to be flown over the U.S. by China, is capable of flying 80.000-120.000 feet above the commercial traffic. It, therefore, can collect information about territories easily. | Interesting Engineering

A high latitude weather balloon... - Standard Digital