Alvin Hill, 12th Operations Support Squadron Weather Operations Flight chief, speaks with Loyce Clark, San Antonio Airport System assistant aviation director, after touring a National Oceanic Atmospheric Administration Gulfstream IV aircraft during the Hurricane Awareness Tour at the San Antonio International Airport May 16, 2016. The NOAA G-IV is used to collect, process and transmit vertical atmospheric soundings in the environment of a hurricane using a dropsonde, which is an instrument dropped from the aircraft carried by a parachute that transmits information about temperature, pressure and humidity.