Tropical Storm Karl As Seen from NOAA's Gulfstream IV 2016 Sep 20 Photo: Lt. David Cowan / NOAA Click for download, licensing and other information i Tropical Storm Karl as seen from NOAA's Gulfstream IV-SP aircraft. Topics Operation Aircraft Operations General Hurricane Hunters, Storm, Tropical Fleet type Aircraft Aircraft Gulfstream IV-SP (G-IV), N49RF Share