The Dvorak technique ( developed between 1969 and 1984 by Vernon Dvorak ) is a widely used system to estimate tropical cyclone intensity ( which includes tropical depression , tropical storm , and hurricane/typhoon/intense tropical cyclone intensities ) based solely on visible and infrared satellite images .
The Dvorak technique ( developed in 1974 by Vernon Dvorak ) is a widely used system to subjectively estimate tropical cyclone intensity based solely on visible and infrared satellite images .