Dropsondes Away! - Described by a researcher as 'Pringles cans with parachutes', scientists dropped sensors called 'dropsondes' into 2001's Hurricane Erin to gain temperature, pressure, moisture and wind readings throughout different locations in the hurricane. An ER-2 allows for eight dropsondes deliveries, while the fully staffed DC-8 plane drops as many as 15 dropsondes within the hurricane.
GCMD keywords can be found on the Internet with the following citation:
Olsen, L.M., G. Major, K. Shein, J. Scialdone, S. Ritz, T. Stevens, M. Morahan, A. Aleman, R. Vogel, S. Leicester, H. Weir, M. Meaux, S. Grebas, C.Solomon, M. Holland, T. Northcutt, R. A. Restrepo, R. Bilodeau, 2013. NASA/Global Change Master Directory (GCMD) Earth Science Keywords. Version 22.214.171.124.0