On the morning of the 6th July 2021, GFS's Challenger 605 fixed-wing aircraft ,B-LVA, successfully completed a dropsonde mission over the South China Sea. In this mission, the crew deployed a total of 7 radiosondes at several designated locations with the aircraft cruising at 31,000 feet. This mission was a collaboration with the Hong Kong Observatory to track storm conditions by measuring atmospheric parameters as the sondes fall to the surface.
For more information on the dropsonde operation, please refer to the HKO website and the following video (in Cantonese only) produced by HKO:
