Terry Hock specializes in the measurement of winds through Global Positioning System (GPS) dropsondes. He led NCAR's development of this revolutionary device that has extended atmospheric profiling capabilities. GPS dropsondes have been deployed since the late 1990s from hurricane-hunting aircraft. They report winds between flight level and the sea surface at 16-foot intervals. The dropsondes have gathered the first-ever wind data at high resolution from the eyewall that swirls around the calm eye of a hurricane. Hock is a researcher in the NCAR's Earth Observing Laboratory.