For their study, Griffith and colleagues analyzed near-infrared light emitted by Titan. Such spectral analyses can show what elements and compounds are present, and in what amounts. They found a lot of methane in the atmosphere, and found its presence waxed and waned. One big fluctuation looked like nothing so much as a hurricane-sized cloud system. One mystery is how the clouds and weather systems form.
Titan spins slowly, providing little vorticity to cloud systems.
In addition, Titan receives about 100 times less power from the sun.